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Zanon I, Clément E, Goasduff A, Menéndez J, Miyagi T, Assié M, Ciemała M, Flavigny F, Lemasson A, Matta A, Ramos D, Rejmund M, Achouri L, Ackermann D, Barrientos D, Beaumel D, Benzoni G, Boston AJ, Boston HC, Bottoni S, Bracco A, Brugnara D, de France G, de Sereville N, Delaunay F, Desesquelles P, Didierjean F, Domingo-Prato C, Dudouet J, Eberth J, Fernández D, Fougères C, Gadea A, Galtarossa F, Girard-Alcindor V, Gonzales V, Gottardo A, Hammache F, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Kaşkaş A, Kim YH, Kuşoğlu A, Labiche M, Leblond S, Lenain C, Lenzi SM, Leoni S, Li H, Ljungvall J, Lois-Fuentes J, Lopez-Martens A, Maj A, Menegazzo R, Mengoni D, Michelagnoli C, Million B, Napoli DR, Nyberg J, Pasqualato G, Podolyak Z, Pullia A, Quintana B, Recchia F, Regueira-Castro D, Reiter P, Rezynkina K, Rojo JS, Salsac MD, Sanchis E, Şenyiğit M, Siciliano M, Sohler D, Stezowski O, Theisen C, Utepov A, Valiente-Dobón JJ, Verney D, Zielinska M. High-Precision Spectroscopy of ^{20}O Benchmarking Ab Initio Calculations in Light Nuclei. Phys Rev Lett 2023; 131:262501. [PMID: 38215380 DOI: 10.1103/physrevlett.131.262501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 09/18/2023] [Accepted: 11/21/2023] [Indexed: 01/14/2024]
Abstract
The excited states of unstable ^{20}O were investigated via γ-ray spectroscopy following the ^{19}O(d,p)^{20}O reaction at 8 AMeV. By exploiting the Doppler shift attenuation method, the lifetimes of the 2_{2}^{+} and 3_{1}^{+} states were firmly established. From the γ-ray branching and E2/M1 mixing ratios for transitions deexciting the 2_{2}^{+} and 3_{1}^{+} states, the B(E2) and B(M1) were determined. Various chiral effective field theory Hamiltonians, describing the nuclear properties beyond ground states, along with a standard USDB interaction, were compared with the experimentally obtained data. Such a comparison for a large set of γ-ray transition probabilities with the valence space in medium similarity renormalization group ab initio calculations was performed for the first time in a nucleus far from stability. It was shown that the ab initio approaches using chiral effective field theory forces are challenged by detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilities were found to be a very constraining test of the performance of the ab initio models.
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Affiliation(s)
- I Zanon
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Ferrara, Italy
| | - E Clément
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - A Goasduff
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - J Menéndez
- Department of Quantum Physics and Astrophysics and Institute of Cosmos Sciences, University of Barcelona, Spain
| | - T Miyagi
- Department of Physics, Technische Universität Darmstadt, Darmstadt, Germany
- ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
| | - M Assié
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | | | - F Flavigny
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
| | - A Lemasson
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - A Matta
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
| | - D Ramos
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - M Rejmund
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - L Achouri
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
| | - D Ackermann
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | | | - D Beaumel
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - G Benzoni
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - A J Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, United Kingdom
| | - H C Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, United Kingdom
| | - S Bottoni
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, Milano, Italy
| | - A Bracco
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, Milano, Italy
| | - D Brugnara
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
- Dipartimento di Fisica, Università di Padova, Padova, Italy
| | - G de France
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - N de Sereville
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - F Delaunay
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
| | - P Desesquelles
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - F Didierjean
- Université de Strasbourg, IPHC, Strasbourg, France
| | - C Domingo-Prato
- Instituto de Fisica Corpuscolar, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - J Dudouet
- Université de Lyon, Université Lyon-1, CNRS/IN2P3, UMR5822, IP2I, F-69622 Villeurbanne Cedex, France
| | - J Eberth
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D Fernández
- IGFAE and Department de Física de Partículas, Universidade of Santiago de Compostela, Santiago de Compostela, Spain
| | - C Fougères
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - A Gadea
- Instituto de Fisica Corpuscolar, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - F Galtarossa
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - V Girard-Alcindor
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - V Gonzales
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia, Spain
| | - A Gottardo
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - F Hammache
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | | | - H Hess
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D S Judson
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, United Kingdom
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
| | - A Kaşkaş
- Department of Physics, Faculty of Science, Ankara University, 06100 Besevler - Ankara, Turkey
| | - Y H Kim
- Institue Laue-Langevin, Grenoble, France
| | - A Kuşoğlu
- Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, Istanbul, Turkey
| | - M Labiche
- STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom
| | - S Leblond
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - C Lenain
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
| | - S M Lenzi
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - S Leoni
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - H Li
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
| | - J Ljungvall
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - J Lois-Fuentes
- IGFAE and Department de Física de Partículas, Universidade of Santiago de Compostela, Santiago de Compostela, Spain
| | - A Lopez-Martens
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - A Maj
- The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - R Menegazzo
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - D Mengoni
- Dipartimento di Fisica, Università di Padova, Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - C Michelagnoli
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
- Institue Laue-Langevin, Grenoble, France
| | - B Million
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - D R Napoli
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - J Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - G Pasqualato
- Dipartimento di Fisica, Università di Padova, Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - Zs Podolyak
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | - A Pullia
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - B Quintana
- Laboratorio de Radiaciones Ionizantes, Departamento de Física Fundamental, Universidad de Salamanca, E-37008 Salamanca, Spain
| | - F Recchia
- Dipartimento di Fisica, Università di Padova, Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - D Regueira-Castro
- IGFAE and Department de Física de Partículas, Universidade of Santiago de Compostela, Santiago de Compostela, Spain
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - K Rezynkina
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - J S Rojo
- Department of Physics, University of York, York, United Kingdom
| | - M D Salsac
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - E Sanchis
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia, Spain
| | - M Şenyiğit
- Department of Physics, Faculty of Science, Ankara University, 06100 Besevler - Ankara, Turkey
| | - M Siciliano
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - D Sohler
- Institute for Nuclear Research, Atomki, 4001 Debrecen, Hungary
| | - O Stezowski
- Université de Lyon, Université Lyon-1, CNRS/IN2P3, UMR5822, IP2I, F-69622 Villeurbanne Cedex, France
| | - Ch Theisen
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Utepov
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
| | | | - D Verney
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - M Zielinska
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
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Pérez-Vidal RM, Gadea A, Domingo-Pardo C, Gargano A, Valiente-Dobón JJ, Clément E, Lemasson A, Coraggio L, Siciliano M, Szilner S, Bast M, Braunroth T, Collado J, Corina A, Dewald A, Doncel M, Dudouet J, de France G, Fransen C, González V, Hüyük T, Jacquot B, John PR, Jungclaus A, Kim YH, Korichi A, Labiche M, Lenzi S, Li H, Ljungvall J, López-Martens A, Mengoni D, Michelagnoli C, Müller-Gatermann C, Napoli DR, Navin A, Quintana B, Ramos D, Rejmund M, Sanchis E, Simpson J, Stezowski O, Wilmsen D, Zielińska M, Boston AJ, Barrientos D, Bednarczyk P, Benzoni G, Birkenbach B, Boston HC, Bracco A, Cederwall B, Cullen DM, Didierjean F, Eberth J, Gottardo A, Goupil J, Harkness-Brennan LJ, Hess H, Judson DS, Kaşkaş A, Korten W, Leoni S, Menegazzo R, Million B, Nyberg J, Podolyak Z, Pullia A, Ralet D, Recchia F, Reiter P, Rezynkina K, Salsac MD, Şenyiğit M, Sohler D, Theisen C, Verney D. Evidence of Partial Seniority Conservation in the πg_{9/2} Shell for the N=50 Isotones. Phys Rev Lett 2022; 129:112501. [PMID: 36154392 DOI: 10.1103/physrevlett.129.112501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 02/08/2022] [Accepted: 07/29/2022] [Indexed: 06/16/2023]
Abstract
The reduced transition probabilities for the 4_{1}^{+}→2_{1}^{+} and 2_{1}^{+}→0_{1}^{+} transitions in ^{92}Mo and ^{94}Ru and for the 4_{1}^{+}→2_{1}^{+} and 6_{1}^{+}→4_{1}^{+} transitions in ^{90}Zr have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the f_{5/2}, p_{3/2}, p_{1/2}, and g_{9/2} proton valence space. Only the combination of extensive lifetime information and large scale shell-model calculations allowed the extent of the seniority conservation in the N=50 g_{9/2} orbital to be understood. The conclusion is that seniority is largely conserved in the first πg_{9/2} orbital.
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Affiliation(s)
- R M Pérez-Vidal
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia E-46980, Spain
- INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - A Gadea
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia E-46980, Spain
| | - C Domingo-Pardo
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia E-46980, Spain
| | - A Gargano
- INFN Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | | | - E Clément
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - A Lemasson
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - L Coraggio
- INFN Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
- Dipartimento di Matematica e Fisica, Università degli Studi della Campania "Luigi Vanvitelli", viale Abramo Lincoln 5, I-81100 Caserta, Italy
| | - M Siciliano
- Physics Division, Argonne National Laboratory, Lemont, 60439 Illinois, USA
| | - S Szilner
- Ruder Bošković Institute, 10000 Zagreb, Croatia
| | - M Bast
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - T Braunroth
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - J Collado
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, E-46100 Valencia, Spain
| | - A Corina
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia BC V5A 1S6, Canada
| | - A Dewald
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - M Doncel
- Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden
| | - J Dudouet
- Université Lyon, Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, F-69622 Villeurbanne, France
| | - G de France
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - C Fransen
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - V González
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, E-46100 Valencia, Spain
| | - T Hüyük
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia E-46980, Spain
- Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
| | - B Jacquot
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - P R John
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
| | - Y H Kim
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - A Korichi
- IJCLab Orsay, IN2P3-CNRS, Université Paris-Saclay and Université Paris-Sud, 91405 Orsay, France
| | - M Labiche
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - S Lenzi
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - H Li
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - J Ljungvall
- IJCLab Orsay, IN2P3-CNRS, Université Paris-Saclay and Université Paris-Sud, 91405 Orsay, France
| | - A López-Martens
- IJCLab Orsay, IN2P3-CNRS, Université Paris-Saclay and Université Paris-Sud, 91405 Orsay, France
| | - D Mengoni
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - C Michelagnoli
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - C Müller-Gatermann
- Physics Division, Argonne National Laboratory, Lemont, 60439 Illinois, USA
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - D R Napoli
- INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - A Navin
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - B Quintana
- Laboratorio de Radiaciones Ionizantes, Universidad de Salamanca, E-37008 Salamanca, Spain
| | - D Ramos
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - M Rejmund
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - E Sanchis
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, E-46100 Valencia, Spain
| | - J Simpson
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - O Stezowski
- Université Lyon, Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, F-69622 Villeurbanne, France
| | - D Wilmsen
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - M Zielińska
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A J Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | | | - P Bednarczyk
- The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland
| | - G Benzoni
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - B Birkenbach
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - H C Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - A Bracco
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - B Cederwall
- Department of Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - D M Cullen
- Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
| | - F Didierjean
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - J Eberth
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - A Gottardo
- INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - J Goupil
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - L J Harkness-Brennan
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - H Hess
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - D S Judson
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - A Kaşkaş
- Department of Physics, Ankara University, 06100 Besevler-Ankara, Turkey
| | - W Korten
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - S Leoni
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - R Menegazzo
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - B Million
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - J Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - Zs Podolyak
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - A Pullia
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - D Ralet
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, F-14076 Caen cedex 5, France
| | - F Recchia
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
| | - K Rezynkina
- INFN Sezione di Padova, I-35131 Padova, Italy
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - M D Salsac
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - M Şenyiğit
- Department of Physics, Ankara University, 06100 Besevler-Ankara, Turkey
| | - D Sohler
- Institute for Nuclear Research, Atomki, 4001 Debrecen, P.O. Box 51, Hungary
| | - Ch Theisen
- Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - D Verney
- IJCLab Orsay, IN2P3-CNRS, Université Paris-Saclay and Université Paris-Sud, 91405 Orsay, France
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Ramos D, Caamaño M, Lemasson A, Rejmund M, Audouin L, Álvarez-Pol H, Frankland JD, Fernández-Domínguez B, Galiana-Baldó E, Piot J, Ackermann D, Biswas S, Clement E, Durand D, Farget F, Fregeau MO, Galaviz D, Heinz A, Henriques AI, Jacquot B, Jurado B, Kim YH, Morfouace P, Ralet D, Roger T, Schmitt C, Teubig P, Tsekhanovich I. First Direct Measurement of Isotopic Fission-Fragment Yields of ^{239}U. Phys Rev Lett 2019; 123:092503. [PMID: 31524478 DOI: 10.1103/physrevlett.123.092503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Indexed: 06/10/2023]
Abstract
A direct and complete measurement of isotopic fission-fragment yields of ^{239}U has been performed for the first time. The ^{239}U fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a ^{238}U beam and a ^{9}Be target at Coulomb barrier energies. The fission fragments were detected and isotopically identified using the VAMOS++ spectrometer at the GANIL facility. The measurement allows us to directly evaluate the fission models at excitation energies of fast neutrons, which are relevant for next-generation nuclear reactors. The present data, in agreement with model calculations, do not support the recently reported anomaly in the fission-fragment yields of ^{239}U, and they confirm the persistence of spherical shell effects in the Sn region at excitation energies exceeding the fission barrier by a few mega-electron volts.
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Affiliation(s)
- D Ramos
- IPN Orsay, Université de Paris-Saclay, CNRS/IN2P3, F-91406 Orsay Cedex, France
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - M Caamaño
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
| | - A Lemasson
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - M Rejmund
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - L Audouin
- IPN Orsay, Université de Paris-Saclay, CNRS/IN2P3, F-91406 Orsay Cedex, France
| | - H Álvarez-Pol
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
| | - J D Frankland
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - B Fernández-Domínguez
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
| | - E Galiana-Baldó
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
- LIP Lisboa, 1649-003 Lisbon, Portugal
| | - J Piot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Ackermann
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - S Biswas
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - E Clement
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Durand
- LPC Caen, Université de Caen Basse-Normandie-ENSICAEN-CNRS/IN2P3, F-14050 Caen Cedex, France
| | - F Farget
- LPC Caen, Université de Caen Basse-Normandie-ENSICAEN-CNRS/IN2P3, F-14050 Caen Cedex, France
| | - M O Fregeau
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Galaviz
- LIP Lisboa, 1649-003 Lisbon, Portugal
| | - A Heinz
- Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - A I Henriques
- CENBG, IN2P3/CNRS-Université de Bordeaux, F-33175 Gradignan Cedex, France
| | - B Jacquot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - B Jurado
- CENBG, IN2P3/CNRS-Université de Bordeaux, F-33175 Gradignan Cedex, France
| | - Y H Kim
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - P Morfouace
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Ralet
- CSNSM, CNRS/IN2P3, Université de Paris-Saclay, F-91405 Orsay, France
| | - T Roger
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - C Schmitt
- IPHC Strasbourg, Université de Strasbourg-CNRS/IN2P3, F-67037 Strasbourg Cedex 2, France
| | - P Teubig
- LIP Lisboa, 1649-003 Lisbon, Portugal
| | - I Tsekhanovich
- CENBG, IN2P3/CNRS-Université de Bordeaux, F-33175 Gradignan Cedex, France
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Mantovani G, Ramos D, Caamaño M, Lemasson A, Rejmund M, Audoin L, Álvarez Pol H, Frankland J, Fernández-Domínguez B, Galiana-Baldó E, Piot J, Gramegna F, Marchi T, Cicerchia M, Ackermann D, Biswas S, Clement E, Durand D, Farget F, Fregeau M, Galaviz D, Heinz A, Henriques A, Jacquot B, Jurado B, Kim Y, Morfouace P, Ralet D, Roger T, Schmitt C, Teubig P, Tsekhanovich I. Study of High-Energy Fission in Inverse Kinematics. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201922301037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Fission at low excitation energy, is a process in which both macroscopic and microscopic aspects are involved. Some features in the total kinetic energy and in the N/Z distributions of the fragments, commonly associated with shell effects, came out in a series of recent experiments with high excitation energy fusionfission reactions in inverse kinematics. In the latest experiment of this campaign, a study of high-energy fission and quasi-fission between a 238U beam and a series of light targets was carried out by using the aforementioned technique, in order to probe the role of the shell structure in these processes.
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Dudouet J, Lemasson A, Duchêne G, Rejmund M, Clément E, Michelagnoli C, Didierjean F, Korichi A, Maquart G, Stezowski O, Lizarazo C, Pérez-Vidal RM, Andreoiu C, de Angelis G, Astier A, Delafosse C, Deloncle I, Dombradi Z, de France G, Gadea A, Gottardo A, Jacquot B, Jones P, Konstantinopoulos T, Kuti I, Le Blanc F, Lenzi SM, Li G, Lozeva R, Million B, Napoli DR, Navin A, Petrache CM, Pietralla N, Ralet D, Ramdhane M, Redon N, Schmitt C, Sohler D, Verney D, Barrientos D, Birkenbach B, Burrows I, Charles L, Collado J, Cullen DM, Désesquelles P, Domingo Pardo C, González V, Harkness-Brennan L, Hess H, Judson DS, Karolak M, Korten W, Labiche M, Ljungvall J, Menegazzo R, Mengoni D, Pullia A, Recchia F, Reiter P, Salsac MD, Sanchis E, Theisen C, Valiente-Dobón JJ, Zielińska M. _{36}^{96}Kr_{60}-Low-Z Boundary of the Island of Deformation at N=60. Phys Rev Lett 2017; 118:162501. [PMID: 28474951 DOI: 10.1103/physrevlett.118.162501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Indexed: 06/07/2023]
Abstract
Prompt γ-ray spectroscopy of the neutron-rich ^{96}Kr, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to J^{π}=4^{+}, is observed for the first time, and a previously reported level energy of the first 2^{+} excited state is confirmed. The measured energy ratio R_{4/2}=E(4^{+})/E(2^{+})=2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N=60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z=36, of similar amplitude to that observed at N=60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g_{9/2}, d_{5/2}, and s_{1/2} orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R_{4/2} as a function of the neutron number up to N=60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N=60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N=60 and Z=36.
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Affiliation(s)
- J Dudouet
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - A Lemasson
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - G Duchêne
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - M Rejmund
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - E Clément
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - C Michelagnoli
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - F Didierjean
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - A Korichi
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - G Maquart
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - O Stezowski
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - C Lizarazo
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - R M Pérez-Vidal
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - G de Angelis
- INFN, Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro, Italy
| | - A Astier
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - C Delafosse
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | - I Deloncle
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - Z Dombradi
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Pf. 51, H-4001 Debrecen, Hungary
| | - G de France
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - A Gadea
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - A Gottardo
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | - B Jacquot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - P Jones
- iThemba LABS, National Research Foundation, P.O. Box 722, Somerset West, 7129 South Africa
| | - T Konstantinopoulos
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - I Kuti
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Pf. 51, H-4001 Debrecen, Hungary
| | - F Le Blanc
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - S M Lenzi
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
| | - G Li
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - R Lozeva
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - B Million
- INFN, Sezione di Milano, Milano 20133, Italy
| | - D R Napoli
- INFN, Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro, Italy
| | - A Navin
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - C M Petrache
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - N Pietralla
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - D Ralet
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - M Ramdhane
- LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 38026 Grenoble Cedex, France
| | - N Redon
- Université, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France
| | - C Schmitt
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - D Sohler
- Institute for Nuclear Research of the Hungarian Academy of Sciences, Pf. 51, H-4001 Debrecen, Hungary
| | - D Verney
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | | | - B Birkenbach
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - I Burrows
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - L Charles
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - J Collado
- Departamento de Ingeniería Electrónica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
| | - D M Cullen
- Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
| | - P Désesquelles
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - C Domingo Pardo
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - V González
- Departamento de Ingeniería Electrónica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
| | - L Harkness-Brennan
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - H Hess
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D S Judson
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - M Karolak
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - W Korten
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - M Labiche
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - J Ljungvall
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - R Menegazzo
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - D Mengoni
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
| | - A Pullia
- INFN, Sezione di Milano, Milano 20133, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - F Recchia
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - M D Salsac
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - E Sanchis
- Departamento de Ingeniería Electrónica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
| | - Ch Theisen
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - J J Valiente-Dobón
- INFN, Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro, Italy
| | - M Zielińska
- IRFU, CEA/DRF, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France
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Ramos D, Rodríguez-Tajes C, Caamaño M, Farget F, Audouin L, Benlliure J, Casarejos E, Clement E, Cortina D, Delaune O, Derkx X, Dijon A, Doré D, Fernández-Domínguez B, de France G, Heinz A, Jacquot B, Navin A, Paradela C, Rejmund M, Roger T, Salsac MD, Schmitt C. Excitation-energy influence at the scission configuration. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714604019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Ramos D, Rodríguez-Tajes C, Caamaño M, Farget F, Audouin L, Benlliure J, Casarejos E, Clement E, Cortina D, Delaune O, Derkx X, Dijon A, Doré D, Fernández-Domínguez B, de France G, Heinz A, Jacquot B, Navin A, Paradela C, Rejmund M, Roger T, Salsac M, Schmitt C. Dependence of Fission-Fragment Properties On Excitation Energy For Neutron-Rich Actinides. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611110001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Watanabe YX, Kim YH, Jeong SC, Hirayama Y, Imai N, Ishiyama H, Jung HS, Miyatake H, Choi S, Song JS, Clement E, de France G, Navin A, Rejmund M, Schmitt C, Pollarolo G, Corradi L, Fioretto E, Montanari D, Niikura M, Suzuki D, Nishibata H, Takatsu J. Pathway for the Production of Neutron-Rich Isotopes around the N=126 Shell Closure. Phys Rev Lett 2015; 115:172503. [PMID: 26551108 DOI: 10.1103/physrevlett.115.172503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Indexed: 06/05/2023]
Abstract
Absolute cross sections for isotopically identified products formed in multinucleon transfer in the (136)Xe+(198)Pt system at ∼8 MeV/nucleon are reported. The isotopic distributions obtained using a large acceptance spectrometer demonstrated the production of the "hard-to-reach" neutron-rich isotopes for Z<78 around the N=126 shell closure far from stability. The main contribution to the formation of these exotic nuclei is shown to arise in collisions with a small kinetic energy dissipation. The present experimental finding corroborates for the first time recent predictions that multinucleon transfer reactions would be the optimum method to populate and characterize neutron-rich isotopes around N=126 which are crucial for understanding both astrophysically relevant processes and the evolution of "magic" numbers far from stability.
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Affiliation(s)
- Y X Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Y H Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Institute for Nuclear and Particle Astrophysics, Seoul National University, Seoul 08826, Korea
| | - S C Jeong
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Y Hirayama
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - N Imai
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - H Ishiyama
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - H S Jung
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - H Miyatake
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - S Choi
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Institute for Nuclear and Particle Astrophysics, Seoul National University, Seoul 08826, Korea
| | - J S Song
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Institute for Nuclear and Particle Astrophysics, Seoul National University, Seoul 08826, Korea
- Institute for Basic Science, Daejeon 34047, Korea
| | - E Clement
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - G de France
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - A Navin
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - M Rejmund
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - C Schmitt
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - G Pollarolo
- Dipartimento di Fisica Teorica, Università di Torino, and Istituto Nazionale di Fisica Nucleare, I-10125 Torino, Italy
| | - L Corradi
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - E Fioretto
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - D Montanari
- Dipartimento di Fisica, Università di Padova, and Istituto Nazionale di Fisica Nucleare, I-35131 Padova, Italy
| | - M Niikura
- Institut de Physique Nucléaire (IPN), IN2P3-CNRS, F-91406 Orsay Cedex, France
| | - D Suzuki
- Institut de Physique Nucléaire (IPN), IN2P3-CNRS, F-91406 Orsay Cedex, France
| | - H Nishibata
- Department of Physics, Osaka University, Osaka 560-0043, Japan
| | - J Takatsu
- Department of Physics, Osaka University, Osaka 560-0043, Japan
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Rejmund M, Maier KH, Broda R, Lach M, Wrzesiński J, Agramunt J, Blomqvist J, Gadea A, Gerl J, Górska M, Grawe H, Kaspar M, Kozhoukharov I, Peter I, Schaffner H, Schubart R, Schlegel C, Stengel G, Wan S, Wollersheim HJ. High spin states in 210Pb. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s002180050397] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Kim YH, Watanabe YX, Hirayama Y, Imai N, Ishiyama H, Jeong SC, Miyatake H, Choi S, Song J, Clement E, de France G, Navin A, Rejmund M, Schmitt C, Pollarolo G, Corradi L, Fioretto E, Montanari D, Niikura M, Suzuki D, Nishibata H, Takatsu J. Study of the multi-nucleon transfer reactions of136Xe +198Pt for producing exotic heavy nuclei. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Shrivastava A, Navin A, Diaz-Torres A, Nanal V, Ramachandran K, Rejmund M, Bhattacharyya S, Chatterjee A, Kailas S, Lemasson A, Palit R, Parkar V, Pillay R, Rout P, Sawant Y. Dynamics of fragment capture for cluster structures of weakly bound7Li. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136302018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Grente L, Salsac MD, Korten W, Görgen A, Hagen TW, Braunroth T, Bruyneel B, Celikovic I, Clément E, Delaune O, Dijon A, Drouart A, Ertürk S, Farget F, de France G, Gottardo A, Hackstein M, Jacquot B, Libert J, Litzinger J, Ljungvall J, Louchart C, Michelagnoli C, Napoli D, Navin A, Pillet N, Pipidis A, Recchia F, Rejmund M, Rother W, Sahin E, Schmitt C, Siem S, Sulignano B, Valiente-Dobon J, Zell K. Lifetime measurements on fission fragments in the A ∼ 100 region. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136201002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Flavigny F, Gillibert A, Nalpas L, Obertelli A, Keeley N, Barbieri C, Beaumel D, Boissinot S, Burgunder G, Cipollone A, Corsi A, Gibelin J, Giron S, Guillot J, Hammache F, Lapoux V, Matta A, Pollacco EC, Raabe R, Rejmund M, de Séreville N, Shrivastava A, Signoracci A, Utsuno Y. Limited asymmetry dependence of correlations from single nucleon transfer. Phys Rev Lett 2013; 110:122503. [PMID: 25166799 DOI: 10.1103/physrevlett.110.122503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 01/09/2013] [Indexed: 06/03/2023]
Abstract
Single nucleon pickup reactions were performed with a 18.1 MeV/nucleon (14)O beam on a deuterium target. Within the coupled reaction channel framework, the measured cross sections were compared to theoretical predictions and analyzed using both phenomenological and microscopic overlap functions. The missing strength due to correlations does not show significant dependence on the nucleon separation energy asymmetry over a wide range of 37 MeV, in contrast with nucleon removal data analyzed within the sudden-eikonal formalism.
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Affiliation(s)
- F Flavigny
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France and Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
| | - A Gillibert
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - L Nalpas
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - A Obertelli
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - N Keeley
- National Centre for Nuclear Research, ul Andrezja Sołtana 7, PL-05400 Otwock, Poland
| | - C Barbieri
- Department of Physics, University of Surrey, Guilford GU2 7XH, United Kingdom
| | - D Beaumel
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - S Boissinot
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | | | - A Cipollone
- Department of Physics, University of Surrey, Guilford GU2 7XH, United Kingdom and Dipartimento di Fisica, Università Sapienza, I-00185 Roma, Italy and INFN, Sezione di Roma, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | - A Corsi
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - J Gibelin
- LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France
| | - S Giron
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - J Guillot
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - F Hammache
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - V Lapoux
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - A Matta
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | - E C Pollacco
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - R Raabe
- Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium and GANIL, BP 55076,14076 Caen Cedex 5, France
| | - M Rejmund
- GANIL, BP 55076,14076 Caen Cedex 5, France
| | - N de Séreville
- Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
| | | | - A Signoracci
- CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
| | - Y Utsuno
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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14
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Delaune O, Caamaño M, Farget F, Tarasov O, Derkx X, Schmidt KH, Audouin L, Amthor A, Bacri CO, Barreau G, Bastin B, Bazin D, Benlliure J, Blank B, Cacères L, Casarejos E, Fernández-Domínguez B, Gaudefroy L, Golabek C, Grévy S, Jurado B, Kamalou O, Lemasson A, Lukyanov S, Mittig W, Morrissey D, Navin A, Pereira J, Perrot L, Rejmund M, Roger T, Saint-Laurent M, Savajols H, Schmitt C, Sherrill B, Stodel C, Thomas J, Villari A. Complete isotopic distributions of fragments produced in transfer- and fusion-induced reactions. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136206006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Delaune O, Caamaño M, Derkx X, Farget F, Schmidt KH, Tarasov O, Audouin L, Amthor A, Bacri CO, Barreau G, Bastin B, Bazin D, Benlliure J, Blank B, Cacères L, Casarejos E, Fernández-Domínguez B, Gaudefroy L, Golabek C, Grévy S, Jurado B, Kamalou O, Lemasson A, Lukyanov S, Mittig W, Morrissey D, Navin A, Pereira J, Perrot L, Rejmund M, Roger T, Saint-Laurent M, Savajols H, Schmitt C, Sherrill B, Stodel C, Taieb J, Thomas J, Villari A. Evolution of isotopic fission-fragment yields with excitation energy. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123100025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Catford WN, Timis CN, Lemmon RC, Labiche M, Orr NA, Fernández-Domínguez B, Chapman R, Freer M, Chartier M, Savajols H, Rejmund M, Achouri NL, Amzal N, Ashwood NI, Baldwin TD, Burns M, Caballero L, Casadjian JM, Curtis N, de France G, Gelletly W, Liang X, Pain SD, Pucknell VPE, Rubio B, Sorlin O, Spohr K, Theisen C, Warner DD. Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction. Phys Rev Lett 2010; 104:192501. [PMID: 20866960 DOI: 10.1103/physrevlett.104.192501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Indexed: 05/29/2023]
Abstract
The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
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Affiliation(s)
- W N Catford
- Department of Physics, University of Surrey, Guildford GU2 5XH, United Kingdom
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17
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Wilson AN, Korichi A, Siem S, Astier A, Bazzacco D, Bednarczyk P, Bergström MH, Chmel S, Cullen DM, Davidson PM, Görgen A, Hannachi F, Hübel H, Kintz N, Lauritsen T, Lopez-Martens A, Lunardi S, Naguleswaran S, Nyakó BM, Rejmund M, Schönwasser G, Schück C, Sharpey-Schafer JF, Timar J, Wadsworth R, Libert J. Two-particle separation energy trends in the superdeformed well. Phys Rev Lett 2010; 104:162501. [PMID: 20482043 DOI: 10.1103/physrevlett.104.162501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Indexed: 05/29/2023]
Abstract
A measurement of the energy and spin of superdeformed states in 190Hg, obtained through the observation of transitions directly linking superdeformed and normal states, expands the number of isotopes in which binding energies at superdeformation are known. Comparison with neighboring nuclei shows that two-proton separation energies are higher in the superdeformed state than in the normal state, despite the lower Coulomb barrier and lower total binding energy. This unexpected result provides a critical test for nuclear models.
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Affiliation(s)
- A N Wilson
- Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200 Australia.
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18
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Derkx X, Rejmund F, Caamaño M, Schmidt KH, Audouin L, Bacri CO, Barreau G, Benlliure J, Casarejos E, Fernández-Domínguez B, Gaudefroy L, Golabek C, Jurado B, Lemasson A, Navin A, Rejmund M, Roger T, Shrivastava A, Schmitt C, Taieb J. Minor actinide fission induced by multi-nucleon transfer reaction in inverse kinematics. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100207001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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19
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Lemasson A, Shrivastava A, Navin A, Rejmund M, Keeley N, Zelevinsky V, Bhattacharyya S, Chatterjee A, de France G, Jacquot B, Nanal V, Pillay RG, Raabe R, Schmitt C. Modern Rutherford experiment: tunneling of the most neutron-rich nucleus. Phys Rev Lett 2009; 103:232701. [PMID: 20366144 DOI: 10.1103/physrevlett.103.232701] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Indexed: 05/29/2023]
Abstract
A modern variation of the Rutherford experiment to probe the tunneling of exotic nuclear matter from the measurement of the residues formed in the bombardment of (197)Au by extremely neutron-rich (8)He nuclei is presented. Using a novel off-beam technique the most precise and accurate measurements of fusion and neutron transfer involving reaccelerated unstable beams are reported. The results show unusual behavior of the tunneling of (8)He compared to that for lighter helium isotopes, highlighting the role of the intrinsic structure of composite many-body quantum systems and pairing correlations.
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Affiliation(s)
- A Lemasson
- GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
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20
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Shrivastava A, Navin A, Lemasson A, Ramachandran K, Nanal V, Rejmund M, Hagino K, Ichikawa T, Bhattacharyya S, Chatterjee A, Kailas S, Mahata K, Parkar VV, Pillay RG, Rout PC. Exploring fusion at extreme sub-barrier energies with weakly bound nuclei. Phys Rev Lett 2009; 103:232702. [PMID: 20366145 DOI: 10.1103/physrevlett.103.232702] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Indexed: 05/29/2023]
Abstract
Results of measurement of residues formed in fusion of (6)Li with (198)Pt in the energy range of 0.68 < E/V(b) < 1.3 using a new sensitive off-beam technique are reported. The fusion excitation function and the derived average angular momenta do not indicate a change of slope at deep sub-barrier energies, contrary to recent observations. The present results for a system with weakly bound projectile confront the current understanding of the fusion hindrance at these low energies, underlying the role of internal reorganization on the dynamical path towards fusion.
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Affiliation(s)
- A Shrivastava
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
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21
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Chatterjee A, Navin A, Shrivastava A, Bhattacharyya S, Rejmund M, Keeley N, Nanal V, Nyberg J, Pillay RG, Ramachandran K, Stefan I, Bazin D, Beaumel D, Blumenfeld Y, de France G, Gupta D, Labiche M, Lemasson A, Lemmon R, Raabe R, Scarpaci JA, Simenel C, Timis C. 1n and 2n transfer with the Borromean nucleus 6He near the Coulomb barrier. Phys Rev Lett 2008; 101:032701. [PMID: 18764247 DOI: 10.1103/physrevlett.101.032701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2008] [Indexed: 05/26/2023]
Abstract
Angular distributions for 1n and 2n transfer are reported for the 6He+65Cu system at E_{lab}=22.6 MeV. For the first time, triple coincidences between alpha particles, neutrons, and characteristic gamma rays from the targetlike residues were used to separate the contributions arising from 1n and 2n transfer. The differential cross sections for these channels, elastic scattering, and fusion were analyzed using a coupled reaction channels approach. The large measured ratio of the 2n-to-1n cross section and the strong influence of 2n transfer on other channels indicate that the dineutron configuration of 6He plays a dominant role in the reaction mechanism.
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Affiliation(s)
- A Chatterjee
- GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
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22
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Bhattacharyya S, Rejmund M, Navin A, Caurier E, Nowacki F, Poves A, Chapman R, O'Donnell D, Gelin M, Hodsdon A, Liang X, Mittig W, Mukherjee G, Rejmund F, Rousseau M, Roussel-Chomaz P, Spohr KM, Theisen C. Structure of neutron-rich Ar isotopes beyond N = 28. Phys Rev Lett 2008; 101:032501. [PMID: 18764246 DOI: 10.1103/physrevlett.101.032501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 03/14/2008] [Indexed: 05/26/2023]
Abstract
Results from the gamma-ray spectroscopy of {47,48}Ar exemplifying new limits of sensitivity for characterizing neutron-rich nuclei at energies around the Coulomb barrier are presented. The present results, along with interacting shell model calculations, highlight the role of cross-shell excitations and indicate the presence of a nonaxial deformation in 48Ar.
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Affiliation(s)
- S Bhattacharyya
- GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
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23
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Caamaño M, Cortina-Gil D, Mittig W, Savajols H, Chartier M, Demonchy CE, Fernández B, Gómez Hornillos MB, Gillibert A, Jurado B, Kiselev O, Lemmon R, Obertelli A, Rejmund F, Rejmund M, Roussel-Chomaz P, Wolski R. Resonance state in 7H. Phys Rev Lett 2007; 99:062502. [PMID: 17930818 DOI: 10.1103/physrevlett.99.062502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2007] [Indexed: 05/25/2023]
Abstract
The existence of the 7H nuclear system was investigated via a one-proton transfer reaction with a 8He beam at 15.4A MeV and a 12C gas target. The experimental setup was based on the active-target MAYA which allowed a complete reconstruction of the reaction kinematics. The existence of the 7H was confirmed with the identification of seven events where the system was formed with a resonance energy of 0.57(-0.21)(+0.42) MeV above the 3H+4n threshold and a resonance width of 0.09(-0.06)(+0.94) MeV. This study represents an unambiguous proof of the existence of the most neutron-proton unbalanced system presently found.
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Affiliation(s)
- M Caamaño
- Department of Particle Physics, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain.
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24
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Bouchez E, Matea I, Korten W, Becker F, Blank B, Borcea C, Buta A, Emsallem A, de France G, Genevey J, Hannachi F, Hauschild K, Hürstel A, Le Coz Y, Lewitowicz M, Lucas R, Negoita F, de Oliveira Santos F, Pantelica D, Pinston J, Rahkila P, Rejmund M, Stanoiu M, Theisen C. New shape isomer in the self-conjugate nucleus 72Kr. Phys Rev Lett 2003; 90:082502. [PMID: 12633421 DOI: 10.1103/physrevlett.90.082502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2002] [Indexed: 05/24/2023]
Abstract
A new isomeric 0(+) state was identified as the first excited state in the self-conjugate (N=Z) nucleus 72Kr. By combining for the first time conversion-electron and gamma-ray spectroscopy with the production of metastable states in high-energy fragmentation, the electric-monopole decay of the new isomer to the ground state was established. The new 0(+) state is understood as the band head of the known prolate rotational structure, which strongly supports the interpretation that 72Kr is one of the rare nuclei having an oblate-deformed ground state. This observation gives in fact the first evidence for a shape isomer in a N=Z nucleus.
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Affiliation(s)
- E Bouchez
- CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France
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25
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Fornal B, Broda R, Maier KH, Wrzesiński J, Lane GJ, Cromaz M, Macchiavelli AO, Clark RM, Vetter K, Byrne AP, Dracoulis GD, Carpenter MP, Janssens RV, Wiedenhoever I, Rejmund M, Blomqvist J. Effective charge of the (pi)h(11/2) orbital and the electric field gradient of Hg from the Yrast structure of 206Hg. Phys Rev Lett 2001; 87:212501. [PMID: 11736335 DOI: 10.1103/physrevlett.87.212501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2001] [Indexed: 05/23/2023]
Abstract
The gamma-ray decay of excited states of the two-proton hole nucleus, 206Hg, has been identified using Gammasphere and 208Pb+238U collisions. The yrast states found include a T(1/2) = 92(8) ns 10(+) isomer located above the known 5(-) isomer. The B(E2;10(+)-->8(+)) strength is used to derive the quadrupole polarization charge induced by the h(11/2) proton hole. Also, the implied quadrupole moment has been used to provide an absolute scale for the electric field gradient of Hg in Hg metal.
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Affiliation(s)
- B Fornal
- Niewodniczanski Institute of Nuclear Physics, PL-31342 Cracow, Poland
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26
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Hauschild K, Rejmund M, Grawe H, Caurier E, Nowacki F, Becker F, Le Coz Y, Korten W, Döring J, Górska M, Schmidt K, Dorvaux O, Helariutta K, Jones P, Julin R, Juutinen S, Kettunen H, Leino M, Muikku M, Nieminen P, Rahkila P, Uusitalo J, Azaiez F, Belleguic M. Isomer spectroscopy in (216)(90)Th(126) and the magicity of (218)(92)U(126). Phys Rev Lett 2001; 87:072501. [PMID: 11497885 DOI: 10.1103/physrevlett.87.072501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2001] [Indexed: 05/23/2023]
Abstract
Excited states in (216)Th were investigated via prompt and delayed gamma decays and the recoil-decay tagging method. The decay schemes of the I(pi) = (8+), t(1/2) = 128(8) micros, the I(pi) = (11-), t(1/2) = 615(55) ns, and the I(pi) = (14+), t(1/2) > or = 130 ns isomers were established. The configuration pi h(9/2)f(7/2) is assigned to the I(pi) = (8+) isomer, which implies that the h(9/2) and f(7/2) states are nearly degenerate. This is ascribed to increased binding of the f(7/2) orbital by its coupling to a low-lying I(pi) = (3-) state at E(x) = 1687 keV. The role of octupole and pairing correlations for a Z = 92 shell closure prediction is discussed on the basis of shell model calculations.
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Affiliation(s)
- K Hauschild
- DAPNIA/SPhN CEA Saclay, F-91191 Gif-sur-Yvette, France
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27
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Leistenschneider A, Aumann T, Boretzky K, Cortina D, Cub J, Datta Pramanik U, Dostal W, Elze TW, Emling H, Geissel H, Grünschloss A, Hellstr M, Holzmann R, Ilievski S, Iwasa N, Kaspar M, Kleinböhl A, Kratz JV, Kulessa R, Leifels Y, Lubkiewicz E, Münzenberg G, Reiter P, Rejmund M, Scheidenberger C, Schlegel C, Simon H, Stroth J, Sümmerer K, Wajda E, Walús W, Wan S. Photoneutron cross sections for unstable neutron-rich oxygen isotopes. Phys Rev Lett 2001; 86:5442-5445. [PMID: 11415271 DOI: 10.1103/physrevlett.86.5442] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2000] [Indexed: 05/23/2023]
Abstract
The dipole response of stable and unstable neutron-rich oxygen nuclei of masses A = 17 to A = 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. A kinematically complete measurement of the neutron decay channel in inelastic scattering of the secondary beam projectiles from a Pb target was performed. Differential electromagnetic excitation cross sections d sigma/dE were derived up to 30 MeV excitation energy. In contrast to stable nuclei, the deduced dipole strength distribution appears to be strongly fragmented and systematically exhibits a considerable fraction of low-lying strength.
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Affiliation(s)
- A Leistenschneider
- Institut für Kernphysik, Johann Wolfgang Goethe-Universität, D-60486 Frankfurt, Germany
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Korichi A, Wilson AN, Hannachi F, Lopez-Martens A, Rejmund M, Schück C, Vieu C, Chmel G, Görgen A, Hübel H, Rossbach D, Schönwasser S, Bergström M, Nyakó BM, Timár J, Bazzacco D, Lunardi S, Rossi-Alvarez C, Bednarczyk P, Kintz N, Naguleswaran S, Astier A, Cullen DM, Sharpey-Schafer JF, Lauritsen T, Wadsworth R. Linear polarization measurement of interband transitions in superdeformed 190hg: model-independent evidence for octupole vibrational structures. Phys Rev Lett 2001; 86:2746-2749. [PMID: 11290029 DOI: 10.1103/physrevlett.86.2746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2000] [Indexed: 05/23/2023]
Abstract
The linear polarization of gamma rays between excited and yrast superdeformed (SD) states in 190Hg was measured using the four-element CLOVER detectors of the EUROBALL IV gamma-ray spectrometer. This measurement shows in a model-independent way that the interband transitions which compete with the highly collective in-band quadrupole transitions are largely enhanced electric dipoles. Not only do these results represent the first measurement of the multipolarity of transitions between different SD states, but they also provide strong evidence for the interpretation of the structures in the SD minimum of the A approximately 190 region in terms of octupole excitations.
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Affiliation(s)
- A Korichi
- Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS et université Paris XI, F-91405 Orsay cedex, France
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