1
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Heine M, Fruet G, Courtin S, Jenkins D, Adsley P, Brown A, Canavan R, Catford W, Charon E, Curien D, Della Negra S, Duprat J, Hammache F, Lesrel J, Lotay G, Meyer A, Monpribat E, Montanari D, Morris L, Moukaddam M, Nippert J, Podolyák Z, Regan P, Ribaud I, Richer M, Rudigier M, Shearman R, de Séréville N, Stodel C. Direct Measurement of Carbon Fusion at Astrophysical Energies with Gamma-Particle Coincidences. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202226001004] [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
We present 12C+12C direct fusion measurements with STELLA UKFATIMA, that reach into the region of astrophysics interest relevant to massive stars (M⊙ ≈ 25) using self-supporting thin rotating carbon foils [1]. We demonstrate that detecting gammas and light charged particles in coincidence with nanosecond timing is key for effective background reduction achieving reliable measurements in the sub-nanobarn range. We give details about core developments of the detection apparatus as well as the coincidence-analysis procedure of low count statistics. The present data largely follows the phenomenological hindrance interpolation and shows indication for resonant behaviour at the lowest energy explored.
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2
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Schmitt C, Lemasson A, Schmidt KH, Jhingan A, Biswas S, Kim YH, Ramos D, Andreyev AN, Curien D, Ciemala M, Clément E, Dorvaux O, De Canditiis B, Didierjean F, Duchêne G, Dudouet J, Frankland J, Jacquot B, Raison C, Ralet D, Retailleau BM, Stuttgé L, Tsekhanovich I. Experimental Evidence for Common Driving Effects in Low-Energy Fission from Sublead to Actinides. Phys Rev Lett 2021; 126:132502. [PMID: 33861122 DOI: 10.1103/physrevlett.126.132502] [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: 07/19/2020] [Revised: 10/22/2020] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Isotopic distributions of fragments from fission of the neutron-deficient ^{178}Hg nuclide are reported. This experimental observable is obtained for the first time in the region around lead using an innovative approach based on inverse kinematics and the coincidence between the large acceptance magnetic spectrometer VAMOS++ and a new detection arm close to the target. The average fragment N/Z ratio and prompt neutron M_{n} multiplicity are derived and compared with current knowledge from actinide fission. A striking consistency emerges, revealing the unexpected dominant role of the proton subsystem with atomic number between the Z=28 and 50 magic numbers. The origin of nuclear charge polarization in fission and fragment deformation at scission are discussed.
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Affiliation(s)
- C Schmitt
- Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3-UDS, 67037 Strasbourg Cedex 2, France
| | - A Lemasson
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | | | - A Jhingan
- Inter University Accelerator Centre, Aruna Asaf Ali Marg, Post Box 10502, New Delhi 110067, India
| | - S Biswas
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - Y H Kim
- Institut Laue-Langevin, 38042 Grenoble Cedex 9, France
| | - D Ramos
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - A N Andreyev
- Department of Physics, University of York, York YO10 5DD, United Kingdom
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
- ISOLDE, CERN, CH-1211 Geneve 23, Switzerland
| | - D Curien
- Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3-UDS, 67037 Strasbourg Cedex 2, France
| | - M Ciemala
- The Niewodniczanski Institute of Nuclear Physics-PAN, 31-342 Kraków, Poland
| | - E Clément
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - O Dorvaux
- Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3-UDS, 67037 Strasbourg Cedex 2, France
| | - B De Canditiis
- Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3-UDS, 67037 Strasbourg Cedex 2, France
| | - F Didierjean
- Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3-UDS, 67037 Strasbourg Cedex 2, France
| | - G Duchêne
- Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3-UDS, 67037 Strasbourg Cedex 2, France
| | - J Dudouet
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
- Université Lyon, Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, F-69622 Villeurbanne, France
| | - J Frankland
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - B Jacquot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - C Raison
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - D Ralet
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - B-M Retailleau
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
| | - L Stuttgé
- Université Lyon, Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, F-69622 Villeurbanne, France
| | - I Tsekhanovich
- Université Bordeaux, CNRS, CENBG, UMR 5797, F-33170 Gradignan, France
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3
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Fruet G, Courtin S, Heine M, Jenkins DG, Adsley P, Brown A, Canavan R, Catford WN, Charon E, Curien D, Della Negra S, Duprat J, Hammache F, Lesrel J, Lotay G, Meyer A, Montanari D, Morris L, Moukaddam M, Nippert J, Podolyák Z, Regan PH, Ribaud I, Richer M, Rudigier M, Shearman R, de Séréville N, Stodel C. Advances in the Direct Study of Carbon Burning in Massive Stars. Phys Rev Lett 2020; 124:192701. [PMID: 32469543 DOI: 10.1103/physrevlett.124.192701] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/27/2019] [Accepted: 02/21/2020] [Indexed: 06/11/2023]
Abstract
The ^{12}C+^{12}C fusion reaction plays a critical role in the evolution of massive stars and also strongly impacts various explosive astrophysical scenarios. The presence of resonances in this reaction at energies around and below the Coulomb barrier makes it impossible to carry out a simple extrapolation down to the Gamow window-the energy regime relevant to carbon burning in massive stars. The ^{12}C+^{12}C system forms a unique laboratory for challenging the contemporary picture of deep sub-barrier fusion (possible sub-barrier hindrance) and its interplay with nuclear structure (sub-barrier resonances). Here, we show that direct measurements of the ^{12}C+^{12}C fusion cross section may be made into the Gamow window using an advanced particle-gamma coincidence technique. The sensitivity of this technique effectively removes ambiguities in existing measurements made with gamma ray or charged-particle detection alone. The present cross-section data span over 8 orders of magnitude and support the fusion-hindrance model at deep sub-barrier energies.
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Affiliation(s)
- G Fruet
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
| | - S Courtin
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
- USIAS/Université de Strasbourg, Strasbourg F-67083, France
| | - M Heine
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
| | - D G Jenkins
- University of York, York YO10 5DD, United Kingdom
| | - P Adsley
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - A Brown
- University of York, York YO10 5DD, United Kingdom
| | - R Canavan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- National Physical Laboratory, Teddington, Middlesex TW110 LW, United Kingdom
| | - W N Catford
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - E Charon
- NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay F-91191 Gif sur Yvette, France
| | - D Curien
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
| | - S Della Negra
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - J Duprat
- Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris Sud, UMR 8609-CNRS/IN2P3, 91405 Orsay, France
| | - F Hammache
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - J Lesrel
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - G Lotay
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - A Meyer
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - D Montanari
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
- USIAS/Université de Strasbourg, Strasbourg F-67083, France
| | - L Morris
- University of York, York YO10 5DD, United Kingdom
| | - M Moukaddam
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J Nippert
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - P H Regan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- National Physical Laboratory, Teddington, Middlesex TW110 LW, United Kingdom
| | - I Ribaud
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - M Richer
- IPHC, Université de Strasbourg, Strasbourg F-67037, France
- CNRS, UMR7178, Strasbourg F-67037, France
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - R Shearman
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- National Physical Laboratory, Teddington, Middlesex TW110 LW, United Kingdom
| | - N de Séréville
- Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - C Stodel
- GANIL, CEA/DSM-CNRS/IN2P3, Caen F-14076, France
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4
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Timár J, Chen QB, Kruzsicz B, Sohler D, Kuti I, Zhang SQ, Meng J, Joshi P, Wadsworth R, Starosta K, Algora A, Bednarczyk P, Curien D, Dombrádi Z, Duchêne G, Gizon A, Gizon J, Jenkins DG, Koike T, Krasznahorkay A, Molnár J, Nyakó BM, Paul ES, Rainovski G, Scheurer JN, Simons AJ, Vaman C, Zolnai L. Experimental Evidence for Transverse Wobbling in ^{105}Pd. Phys Rev Lett 2019; 122:062501. [PMID: 30822069 DOI: 10.1103/physrevlett.122.062501] [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: 10/04/2018] [Revised: 12/12/2018] [Indexed: 06/09/2023]
Abstract
New rotational bands built on the ν(h_{11/2}) configuration have been identified in ^{105}Pd. Two bands built on this configuration show the characteristics of transverse wobbling: the ΔI=1 transitions between them have a predominant E2 component and the wobbling energy decreases with increasing spin. The properties of the observed wobbling bands are in good agreement with theoretical results obtained using constrained triaxial covariant density functional theory and quantum particle rotor model calculations. This provides the first experimental evidence for transverse wobbling bands based on a one-neutron configuration, and also represents the first observation of wobbling motion in the A∼100 mass region.
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Affiliation(s)
- J Timár
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - Q B Chen
- Physik-Department, Technische Universität München, D-85747 Garching, Germany
| | - B Kruzsicz
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - D Sohler
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - I Kuti
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - S Q Zhang
- State Key Laboratory of Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J Meng
- State Key Laboratory of Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - P Joshi
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - R Wadsworth
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - K Starosta
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - A Algora
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
- Instituto de Fisica Corpuscular, CSIC-University of Valencia, E-46071 Valencia, Spain
| | - P Bednarczyk
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - D Curien
- Université de Strasbourg, CNRS, IPHC UMR7178, 67037 Strasbourg, France
| | - Zs Dombrádi
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - G Duchêne
- Université de Strasbourg, CNRS, IPHC UMR7178, 67037 Strasbourg, France
| | - A Gizon
- LPSC, IN2P3-CNRS/UJF, F-38026 Grenoble-Cedex, France
| | - J Gizon
- LPSC, IN2P3-CNRS/UJF, F-38026 Grenoble-Cedex, France
| | - D G Jenkins
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - T Koike
- Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - A Krasznahorkay
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - J Molnár
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - B M Nyakó
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
| | - E S Paul
- Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - G Rainovski
- Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
| | - J N Scheurer
- Université Bordeaux 1, IN2P3-CENBG-Le Haut-Vigneau BP120 33175, Gradignan Cedex, France
| | - A J Simons
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - C Vaman
- Department of Physics and Astronomy, SUNY, Stony Brook, New York 11794-3800, USA
| | - L Zolnai
- Institute for Nuclear Research, Hungarian Academy of Sciences, Pf. 51, 4001 Debrecen, Hungary
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5
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Tonev D, Yavahchova MS, de Angelis G, Brant S, Frauendorf S, Petkov P, Dewald A, Zhong Q, Curien D, Goutev N, Bhowmik R, Singh R, Muralithar S, Madhavan N, Kumar R, Kumar Raju M, Kaur J, Mahanto G, Singh A, Kaur N, Garg R, Sukla A, Geleva E, Marinov TK. Lifetime measurements in mass regions A=100 and A=130 as a test for chirality in nuclear systems. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201610703006] [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: 11/15/2022] Open
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6
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Jolie J, Régis JM, Wilmsen D, Ahmed S, Pfeiffer M, Saed-Samii N, Warr N, Blanc A, Jentschel M, Köster U, Mutti P, Soldner T, Simpson G, De France G, Urban W, Drouet F, Vancraeyenest A, Baczyk P, Czerwinski M, Korgul A, Mazzocchi C, Rzaca-Urban T, Bruce A, Roberts O, Fraile L, Mach H, Paziy V, Ignatov A, Ilieva S, Kröll T, Scheck M, Thürauf M, Ivanova D, Kisyov S, Lalkovski S, Podolyák Z, Regan P, Korten W, Zielinska M, Salsac M, Habs D, Thirolf P, Ur CA, Bernards C, Casten R, Cooper N, Werner V, Cakirli R, Leoni S, Benzoni G, Bocchi G, Bottoni S, Crespi F, Fornal B, Cieplicka N, Szpak B, Petrache C, Leguillon R, John R, Lorenz C, Massarczyk R, Schwengner R, Curien D, Lozeva R, Sengele L, Marginean N, Lica R. The (n,γ) campaigns at EXILL. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159301014] [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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7
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Jentschel M, Urban W, Krempel J, Tonev D, Dudek J, Curien D, Lauss B, de Angelis G, Petkov P. Ultrahigh-resolution γ-ray spectroscopy of 156Gd: a test of tetrahedral symmetry. Phys Rev Lett 2010; 104:222502. [PMID: 20867162 DOI: 10.1103/physrevlett.104.222502] [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: 02/26/2010] [Indexed: 05/29/2023]
Abstract
Tetrahedral symmetry in strongly interacting systems would establish a new class of quantum effects at subatomic scale. Excited states in 156Gd that could carry the information about the tetrahedral symmetry were populated in the 155Gd(n,γ)156Gd reaction and studied using the GAMS4/5 Bragg spectrometers at the Institut Laue-Langevin. We have identified the 5(1)- → 3(1)- transition of 131.983(12) keV in 156Gd and determined its intensity to be 1.9(3)x10(-6) per neutron capture. The lifetime τ=220(-30)(+180) fs of the 5(1)- state in 156Gd has been measured using the GRID technique. The resulting B(E2)=293(-134)(+6) Weisskopf unit rate of the 131.983 keV transition provides the intrinsic quadrupole moment of the 5(1)- state in 156Gd to be Q0=7.1(-1.6)(+0.7) b. This large value, comparable to the quadrupole moment of the ground state in 156Gd, gives strong evidence against tetrahedral symmetry in the lowest odd-spin, negative-parity band of 156Gd.
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Affiliation(s)
- M Jentschel
- Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, F-38042 Grenoble, France
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8
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Leoni S, Benzoni G, Blasi N, Bracco A, Brambilla S, Camera F, Corsi A, Crespi FCL, Mason P, Million B, Montanari D, Pignanelli M, Vigezzi E, Wieland O, Matsuo M, Shimizu YR, Curien D, Duchêne G, Robin J, Bednarczyk P, Castoldi M, Herskind B, Kmiecik M, Maj A, Meczynski W, Styczen J, Zieblinski M, Zuber K, Zucchiatti A. Probing the order-to-chaos region in superdeformed 151Tb and 196Pb nuclei with continuum gamma transitions. Phys Rev Lett 2008; 101:142502. [PMID: 18851522 DOI: 10.1103/physrevlett.101.142502] [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: 06/27/2008] [Indexed: 05/26/2023]
Abstract
The gamma decay associated with the warm rotation of the superdeformed nuclei 151Tb and 196Pb has been measured with the EUROBALL IV array. Several independent quantities provide a stringent test of the population and decay dynamics in the superdeformed well. A Monte Carlo simulation of the gamma decay based on microscopic calculations gives remarkable agreement with the data only assuming a large enhancement of the B(E1) strength for 1-2 MeV gamma rays, which may be related to the evidence for octupole vibrations in both mass regions.
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Affiliation(s)
- S Leoni
- Dipartimento di Fisica and INFN, Sezione di Milano,Via Celoria 16, 20133 Milano, Italy
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9
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Gadea A, Lenzi SM, Lunardi S, Mărginean N, Zuker AP, de Angelis G, Axiotis M, Martínez T, Napoli DR, Farnea E, Menegazzo R, Pavan P, Ur CA, Bazzacco D, Venturelli R, Kleinheinz P, Bednarczyk P, Curien D, Dorvaux O, Nyberg J, Grawe H, Górska M, Palacz M, Lagergren K, Milechina L, Ekman J, Rudolph D, Andreoiu C, Bentley MA, Gelletly W, Rubio B, Algora A, Nacher E, Caballero L, Trotta M, Moszyński M. Observation of 54Ni: cross-conjugate symmetry in f7/2 mirror energy differences. Phys Rev Lett 2006; 97:152501. [PMID: 17155324 DOI: 10.1103/physrevlett.97.152501] [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: 06/01/2006] [Indexed: 05/12/2023]
Abstract
Gamma decays from excited states up to Jpi=6+ in the N=Z-2 nucleus 54Ni have been identified for the first time. Level energies are compared with those of the isobars 54Co and 54Fe and of the cross-conjugate nuclei of mass A=42. The good but puzzling f7/ cross-conjugate symmetry in mirror and triplet energy differences is analyzed. Shell model calculations reproduce the new data but the necessary nuclear charge-dependent phenomenology is not fully explained by modern nucleon-nucleon potentials.
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Affiliation(s)
- A Gadea
- INFN Laboratori Nazionali di Legnaro, Italy
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10
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Dudek J, Curien D, Dubray N, Dobaczewski J, Pangon V, Olbratowski P, Schunck N. Island of rare Earth nuclei with tetrahedral and octahedral symmetries: possible experimental evidence. Phys Rev Lett 2006; 97:072501. [PMID: 17026223 DOI: 10.1103/physrevlett.97.072501] [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: 03/13/2006] [Indexed: 05/12/2023]
Abstract
Calculations using realistic mean-field methods suggest the existence of nuclear shapes with tetrahedral Td and/or octahedral Oh symmetries sometimes at only a few hundreds of keV above the ground states in some rare earth nuclei around 156Gd and 160Yb. The underlying single-particle spectra manifest exotic fourfold rather than Kramers's twofold degeneracies. The associated shell gaps are very strong, leading to a new form of shape coexistence in many rare earth nuclei. We present possible experimental evidence of the new symmetries based on the published experimental results--although an unambiguous confirmation will require dedicated experiments.
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Affiliation(s)
- J Dudek
- Institut Pluridisciplinaire Hubert Curien IN2P3-CNRS/Université Louis Pasteur, F-67037 Strasbourg Cedex 2, France
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11
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Tonev D, de Angelis G, Petkov P, Dewald A, Brant S, Frauendorf S, Balabanski DL, Pejovic P, Bazzacco D, Bednarczyk P, Camera F, Fitzler A, Gadea A, Lenzi S, Lunardi S, Marginean N, Möller O, Napoli DR, Paleni A, Petrache CM, Prete G, Zell KO, Zhang YH, Zhang JY, Zhong Q, Curien D. Transition probabilities in 134Pr: a test for chirality in nuclear systems. Phys Rev Lett 2006; 96:052501. [PMID: 16486924 DOI: 10.1103/physrevlett.96.052501] [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: 07/04/2005] [Indexed: 05/06/2023]
Abstract
Exited states in 134Pr were populated in the fusion-evaporation reaction 119Sn(19F,4n)134Pr. Recoil distance Doppler-shift and Doppler-shift attenuation measurements using the Euroball spectrometer, in conjunction with the inner Bismuth Germanate ball and the Cologne plunger, were performed at beam energies of 87 MeV and 83 MeV, respectively. Reduced transition probabilities in 134Pr are compared to the predictions of the two quasiparticle + triaxial rotor and interacting boson fermion-fermion models. The experimental results do not support the presence of static chirality in 134Pr underlying the importance of shape fluctuations. Only within a dynamical context the presence of intrinsic chirality in 134Pr can be supported.
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Affiliation(s)
- D Tonev
- Laboratori Nazionali di Legnaro, INFN, I-35020 Legnaro, Italy
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12
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Leoni S, Matsuo M, Bracco A, Benzoni G, Blasi N, Camera F, Grassi C, Million B, Paleni A, Pignanelli M, Vigezzi E, Wieland O, Døssing T, Herskind B, Hagemann GB, Wilson J, Maj A, Kmiecik M, Lo Bianco G, Petrache CM, Castoldi M, Zucchiati A, De Angelis G, Napoli D, Bednarczyk P, Curien D. Compound and rotational damping in warm deformed rare-earth nuclei. Phys Rev Lett 2004; 93:022501. [PMID: 15323907 DOI: 10.1103/physrevlett.93.022501] [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: 12/17/2003] [Indexed: 05/24/2023]
Abstract
The gamma decay in the quasicontinuum from selected configurations of the rotational nucleus 163Er has been measured with the EUROBALL array. A new analysis technique has allowed for the first time to directly measure the compound and rotational damping widths Gamma (micro) and Gamma (rot). Values of Gamma (micro) approximately 20 keV and Gamma (rot) approximately 200 keV are obtained in the spin region I approximately 30-40 variant Planck's over 2pi, in good agreement with microscopic cranked shell model calculations. A dependence of Gamma (micro) and Gamma (rot) on the K-quantum number of the nuclear states is also presented.
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Affiliation(s)
- S Leoni
- Dipartimento di Fisica, Universitá di Milano, INFN sezione di Milano, Via Celoria 16, 20133 Milano, Italy
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13
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Jensen DR, Hagemann GB, Hamamoto I, Ødegård SW, Herskind B, Sletten G, Wilson JN, Spohr K, Hübel H, Bringel P, Neusser A, Schönwasser G, Singh AK, Ma WC, Amro H, Bracco A, Leoni S, Benzoni G, Maj A, Petrache CM, Bianco GL, Bednarczyk P, Curien D. Evidence for second-phonon nuclear wobbling. Phys Rev Lett 2002; 89:142503. [PMID: 12366039 DOI: 10.1103/physrevlett.89.142503] [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: 05/17/2002] [Indexed: 05/23/2023]
Abstract
The nucleus 163Lu has been populated through the reaction 139La(29Si,5n) with a beam energy of 157 MeV. Three triaxial, strongly deformed (TSD) bands have been observed with very similar rotational properties. The first excited TSD band has earlier been assigned as a one-phonon wobbling excitation built on the lowest-lying (yrast) TSD band. The large B(E2)(out)/B(E2)(in) value obtainable for one of four observed transitions between the second and first excited TSD bands is in good agreement with particle-rotor calculations for a two-phonon wobbling excitation.
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Affiliation(s)
- D R Jensen
- The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
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14
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Odegård SW, Hagemann GB, Jensen DR, Bergström M, Herskind B, Sletten G, Törmänen S, Wilson JN, Tjøm PO, Hamamoto I, Spohr K, Hübel H, Görgen A, Schönwasser G, Bracco A, Leoni S, Maj A, Petrache CM, Bednarczyk P, Curien D. Evidence for the wobbling mode in nuclei. Phys Rev Lett 2001; 86:5866-5869. [PMID: 11415381 DOI: 10.1103/physrevlett.86.5866] [Citation(s) in RCA: 6] [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: 01/26/2001] [Indexed: 05/23/2023]
Abstract
The nucleus (163)Lu has been populated through the fusion-evaporation reaction (139)La((29)Si,5n)(163)Lu with a beam energy of 152 MeV. The electromagnetic properties of several connecting transitions between two presumably triaxial, strongly deformed (TSD) bands have been studied. Evidence is presented for the assignment of the excited TSD band as a wobbling mode built on the yrast TSD band, based on comparisons to new calculations in which an aligned particle is coupled to a strongly deformed triaxial rotor. The wobbling mode is uniquely related to triaxiality in nuclei.
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Affiliation(s)
- S W Odegård
- The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
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15
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Theisen C, Khadiri N, Vivien JP, Ragnarsson I, Beausang CW, Beck FA, Belier G, Byrski T, Curien D, Disdier D, Duchêne G, Finck C, Flibotte S, Gall B, Haas B, Hanine H, Herskind B, Kharraja B, Merdinger JC, Nourreddine A, Nyakó BM, Perez GE, Prévost D, Stezowski O, Rauch V, Rigollet C, Savajols H, Sharpey-Schafer J, Twin PJ, Wei L, Zuber K. Favored neutron excitations in superdeformed 147Gd. Phys Rev C Nucl Phys 1996; 54:2910-2915. [PMID: 9971662 DOI: 10.1103/physrevc.54.2910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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16
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Savajols H, Korichi A, Ward D, Appelbe D, Ball GC, Beausang C, Beck FA, Byrski T, Curien D, Dagnall P, Disdier D, Duchêne G, Erturk S, Finck C, Flibotte S, Gall B, Galindo-Uribarri A, Haas B, Hackman G, Janzen VP, Kharraja B, Lisle JC, Merdinger JC, Mullins SM, Pilotte S, Prévost D, Radford DC, Rauch V, Rigollet C, Smalley D, Smith MB, Stezowski O, Styczen J, Theisen C, Twin PJ, Vivien JP, Waddington JC, Zuber K, Ragnarsson I. Lifetime measurements of superdeformed bands in 148-149Gd and 152Dy: Evidence for structure-dependent elongations. Phys Rev Lett 1996; 76:4480-4483. [PMID: 10061302 DOI: 10.1103/physrevlett.76.4480] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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17
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Fallon P, Beausang CW, Clarke S, Twin PJ, Beck FA, Byrski T, Curien D, Dagnall PJ, deFrance G, Duchêne G, Forsyth PD, Haas B, Joyce MJ, Macchiavelli AO, Paul ES, Sharpey-Schafer JF, Simpson J, Vivien JP, Åberg S, Nazarewicz W. Pair excitations and a proton band crossing in superdeformed 150Gd. Phys Rev Lett 1994; 73:782-785. [PMID: 10057538 DOI: 10.1103/physrevlett.73.782] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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18
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Flibotte S, Andrews HR, Ball GC, Beausang CW, Beck FA, Belier G, Byrski T, Curien D, Dagnall PJ, Disdier D, Duchêne G, Finck C, Haas B, Hackman G, Haslip DS, Janzen VP, Kharraja B, Lisle JC, Merdinger JC, Mullins SM, Nazarewicz W, Radford DC, Rauch V, Savajols H, Styczen J, Theisen C, Twin PJ, Vivien JP, Waddington JC, Ward D, Zuber K, Åberg S. Delta I=4 bifurcation in a superdeformed band: Evidence for a C4 symmetry. Phys Rev Lett 1993; 71:4299-4302. [PMID: 10055211 DOI: 10.1103/physrevlett.71.4299] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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19
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Curien D, Beausang CW, Beck FA, Byrski T, Clarke S, Dagnall P, Duchêne G, Flibotte S, Forbes S, Forsyth PD, Haas B, Joyce MA, Kharraja B, Nyakó BM, Schück C, Simpson J, Theisen C, Twin PJ, Vivien JP, Zolnai L. Deexcitation from superdeformed bands in 151Tb and neighboring A~150 nuclei. Phys Rev Lett 1993; 71:2559-2562. [PMID: 10054712 DOI: 10.1103/physrevlett.71.2559] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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20
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Beausang CW, Fallon P, Clarke S, Beck FA, Byrski T, Curien D, Dagnall PJ, deFrance G, Duchêne G, Forsyth PD, Haas B, Joyce MJ, Macchiavelli AO, Paul ES, Sharpey-Schafer JF, Simpson J, Twin PJ, Vivien JP. Degenerate superdeformed states in 150Gd. Phys Rev Lett 1993; 71:1800-1803. [PMID: 10054503 DOI: 10.1103/physrevlett.71.1800] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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21
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Flibotte S, Hackman G, Theisen C, Andrews HR, Ball GC, Beausang CW, Beck FA, Belier G, Bentley MA, Byrski T, Curien D, Disdier D, Duchêne G, Fallon P, Haas B, Janzen VP, Jones PM, Kharraja B, Kuehner JA, Lisle JC, Merdinger JC, Mullins SM, Paul ES, Prévost D, Radford DC, Rauch V, Smith JF, Styczen J, Twin PJ, Vivien JP, Waddington JC, Ward D, Zuber K. Multiparticle excitations and identical bands in the superdeformed 149Gd nucleus. Phys Rev Lett 1993; 71:688-691. [PMID: 10055341 DOI: 10.1103/physrevlett.71.688] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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22
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Mullins SM, Wyss RA, Fallon P, Byrski T, Curien D, Forbes SA, He YJ, Metcalfe MS, Nolan PJ, Paul ES, Poynter RJ, Regan PH, Wadsworth R. Superdeformation and double blocking in 142Eu. Phys Rev Lett 1991; 66:1677-1680. [PMID: 10043279 DOI: 10.1103/physrevlett.66.1677] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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23
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Byrski T, Beck FA, Curien D, Schuck C, Fallon P, Alderson A, Ali I, Bentley MA, Bruce AM, Forsyth PD, Howe D, Roberts JW, Sharpey-Schafer JF, Smith G, Twin PJ. Observation of identical superdeformed bands in N=86 nuclei. Phys Rev Lett 1990; 64:1650-1653. [PMID: 10041452 DOI: 10.1103/physrevlett.64.1650] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Kreiner AJ, Vanin VR, Beck FA, Bourgeois C, Byrski T, Curien D, Duchne G, Haas B, Merdinger JC, Porquet MG, Romain P, Rouabah S, Santos D, Vivien JP. Double blocking in doubly odd deformed nuclei: The case of 178Re. Phys Rev C Nucl Phys 1989; 40:487-490. [PMID: 9966006 DOI: 10.1103/physrevc.40.r487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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25
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Ollivier JP, Julien J, Curien D, Gaillard JF, Brion R, Quatre JM, Droniou J. [24-hour efficacy of a system of transcutaneous administration of nitroglycerin. Evaluation by the exercise test and gamma angiography]. Ann Cardiol Angeiol (Paris) 1987; 36:467-72. [PMID: 3122628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effects of a nitroglycerin transdermal therapeutic system (TTS NG 10 mg/24 h) 24 hours after application were evaluated by exercise left ventricular radionuclide cineangiography. 20 patients with ischemic heart disease were included in a double-blind, within patient, acute study comparing TTS NG to placebo. Were measured: exercise-test parameters and global (EF) and regional (rEF) ejection fractions at rest and during exercise. At maximum load, the double product rose from 18,680 +/- 4,118 with placebo to 21,538 +/- 3,988 with TTs NG (p less than 0.01) and ST-segment depression at same load decreased from 2.6 +/- 0.7 mm with placebo to 1.0 +/- 0.7 mm with TTS NG (p less than 0.001). Exercise EF increased from 0.57 +/- 0.15 with placebo to 0.63 +/- 0.12 with TTS NG (p less than 0.001) and was higher at exercise than at rest. Two hypokinetic territories improved during exercise with TTS NG: basal rEF increased to 0.45 +/- 0.07 with TTS NG versus 0.31 +/- 0.13 with placebo (p less than 0.01); anteroseptal rEF increased to 0.49 +/- 0.14 versus 0.43 +/- 0.14 with placebo (p 0.05); no significant improvement was observed in anterolateral and inferior territories were previous myocardial infarction occurred predominantly. These data demonstrate the 24 hours efficacy of this new galenic form of TTS NG in ischemic heart disease on exercise test parameters. TTS NG improving predominantly regional kinetics of ischemic but non infarcted territories and thus improving EF at exercise.
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Affiliation(s)
- J P Ollivier
- Clinique Cardiologique, Hôpital du Val-de-Grâce, Paris
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