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Gray TJ, Allmond JM, Stuchbery AE, Yu CH, Baktash C, Gargano A, Galindo-Uribarri A, Radford DC, Batchelder JC, Beene JR, Bingham CR, Coraggio L, Covello A, Danchev M, Gross CJ, Hausladen PA, Itaco N, Krolas W, Liang JF, Padilla-Rodal E, Pavan J, Stracener DW, Varner RL. Early Signal of Emerging Nuclear Collectivity in Neutron-Rich ^{129}Sb. Phys Rev Lett 2020; 124:032502. [PMID: 32031845 DOI: 10.1103/physrevlett.124.032502] [Citation(s) in RCA: 2] [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: 07/17/2019] [Revised: 11/05/2019] [Indexed: 06/10/2023]
Abstract
Radioactive ^{129}Sb, which can be treated as a proton plus semimagic ^{128}Sn core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2^{+}⊗πg_{7/2} multiplet members and candidate πd_{5/2} state were measured. The results indicate that the total electric quadrupole strength of ^{129}Sb is a factor of 1.39(11) larger than the ^{128}Sn core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.
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Affiliation(s)
- T J Gray
- Department of Nuclear Physics, Australian National University, Canberra ACT 2601, Australia
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A E Stuchbery
- Department of Nuclear Physics, Australian National University, Canberra ACT 2601, Australia
| | - C-H Yu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Baktash
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Gargano
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | - A Galindo-Uribarri
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D C Radford
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J C Batchelder
- Department of Nuclear Engineering, University of California, Berkeley, Berkeley, California 94720, USA
| | - J R Beene
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C R Bingham
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - L Coraggio
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | - A Covello
- Dipartimento di Fisica "Ettore Pancini", Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | - M Danchev
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
| | - C J Gross
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P A Hausladen
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Itaco
- Istituto Nazionale di Fisica Nucleare, 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
| | - W Krolas
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), PL-31342 Kraków, Poland
| | - J F Liang
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Padilla-Rodal
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Instituto de Ciencias Nucleares, UNAM, AP 70-543, 04510 Mexico City, Mexico
| | - J Pavan
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Allmond JM, Stuchbery AE, Baktash C, Gargano A, Galindo-Uribarri A, Radford DC, Bingham CR, Brown BA, Coraggio L, Covello A, Danchev M, Gross CJ, Hausladen PA, Itaco N, Lagergren K, Padilla-Rodal E, Pavan J, Riley MA, Stone NJ, Stracener DW, Varner RL, Yu CH. Electromagnetic Moments of Radioactive ^{136}Te and the Emergence of Collectivity 2p⊕2n Outside of Double-Magic ^{132}Sn. Phys Rev Lett 2017; 118:092503. [PMID: 28306272 DOI: 10.1103/physrevlett.118.092503] [Citation(s) in RCA: 3] [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: 12/05/2016] [Indexed: 06/06/2023]
Abstract
Radioactive ^{136}Te has two valence protons and two valence neutrons outside of the ^{132}Sn double shell closure, providing a simple laboratory for exploring the emergence of collectivity and nucleon-nucleon interactions. Coulomb excitation of ^{136}Te on a titanium target was utilized to determine an extensive set of electromagnetic moments for the three lowest-lying states, including B(E2;0_{1}^{+}→2_{1}^{+}), Q(2_{1}^{+}), and g(2_{1}^{+}). The results indicate that the first-excited state, 2_{1}^{+}, composed of the simple 2p⊕2n system, is prolate deformed, and its wave function is dominated by excited valence neutron configurations, but not to the extent previously suggested. It is demonstrated that extreme sensitivity of g(2_{1}^{+}) to the proton and neutron contributions to the wave function provides unique insight into the nature of emerging collectivity, and g(2_{1}^{+}) was used to differentiate among several state-of-the-art theoretical calculations. Our results are best described by the most recent shell model calculations.
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Affiliation(s)
- J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A E Stuchbery
- Department of Nuclear Physics, Australian National University, Canberra ACT 0200, Australia
| | - C Baktash
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Gargano
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | - A Galindo-Uribarri
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D C Radford
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C R Bingham
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - L Coraggio
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | - A Covello
- Dipartimento di Fisica "Ettore Pancini", Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy
| | - M Danchev
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
| | - C J Gross
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P A Hausladen
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Itaco
- Istituto Nazionale di Fisica Nucleare, 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
| | - K Lagergren
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Padilla-Rodal
- Instituto de Ciencias Nucleares, UNAM, AP 70-543, 04510 Mexico City, Mexico
| | - J Pavan
- Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M A Riley
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - N J Stone
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C-H Yu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Kusoglu A, Stuchbery AE, Georgiev G, Brown BA, Goasduff A, Atanasova L, Balabanski DL, Bostan M, Danchev M, Detistov P, Gladnishki KA, Ljungvall J, Matea I, Radeck D, Sotty C, Stefan I, Verney D, Yordanov DT. Magnetism of an excited self-conjugate nucleus: precise measurement of the g factor of the 2(1)(+) state in (24)Mg. Phys Rev Lett 2015; 114:062501. [PMID: 25723214 DOI: 10.1103/physrevlett.114.062501] [Citation(s) in RCA: 2] [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: 11/04/2014] [Indexed: 06/04/2023]
Abstract
A precise measurement of the g factor of the first-excited state in the self-conjugate (N=Z) nucleus (24)Mg is performed by a new time-differential recoil-in-vacuum method based on the hyperfine field of hydrogenlike ions. Theory predicts that the g factors of such states, in which protons and neutrons occupy the same orbits, should depart from 0.5 by a few percent due to configuration mixing and meson-exchange effects. The experimental result, g=0.538±0.013, is in excellent agreement with recent shell-model calculations and shows a departure from 0.5 by almost 3 standard deviations, thus achieving, for the first time, the precision and accuracy needed to test theory. Proof of the new method opens the way for wide applications including measurements of the magnetism of excited states of exotic nuclei produced as radioactive beams.
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Affiliation(s)
- A Kusoglu
- CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France and Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey
| | - A E Stuchbery
- Department of Nuclear Physics, RSPE, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - G Georgiev
- CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Goasduff
- CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France
| | - L Atanasova
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
| | - D L Balabanski
- ELI-NP, Horia Hulubei National Institute of Physics and Nuclear Engineering, 077125 Magurele, Romania
| | - M Bostan
- Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey
| | - M Danchev
- Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
| | - P Detistov
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
| | - K A Gladnishki
- Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
| | - J Ljungvall
- CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France
| | - I Matea
- IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France
| | - D Radeck
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Köln, Germany
| | - C Sotty
- CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France
| | - I Stefan
- IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France
| | - D Verney
- IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France
| | - D T Yordanov
- IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France and Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany and CERN European Organization for Nuclear Research, Physics Department, CH-1211 Geneva 23, Switzerland
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Pietralla N, Möller T, Ahn T, Bauer C, Coquard L, Danchev M, Gladnishki K, Krugmann A, Leske J, Möller O, Neumann-Cosel PV, Ponomarev V, Rainovski G, Scheikh Obeid A, Scheck M, Walz C, Wambach J. Progress on the study of nuclear states with mixed proton-neutron symmetry. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123810001] [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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5
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Stone NJ, Stuchbery AE, Danchev M, Pavan J, Timlin CL, Baktash C, Barton C, Beene J, Benczer-Koller N, Bingham CR, Dupak J, Galindo-Uribarri A, Gross CJ, Kumbartzki G, Radford DC, Stone JR, Zamfir NV. First nuclear moment measurement with radioactive beams by the recoil-in-vacuum technique: the g factor of the 2+1 state in 132Te. Phys Rev Lett 2005; 94:192501. [PMID: 16090167 DOI: 10.1103/physrevlett.94.192501] [Citation(s) in RCA: 5] [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: 11/16/2004] [Indexed: 05/03/2023]
Abstract
Following Coulomb excitation of the radioactive ion beam (RIB) 132Te at HRIBF we report the first use of the recoil-in-vacuum (RIV) method to determine the g factor of the 2(+)(1) state: g(973.9 keV 2(+) 132Te) = (+)0.35(5). The advantages offered by the RIV method in the context of RIBs and modern detector arrays are discussed.
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Affiliation(s)
- N J Stone
- Department of Physics, University of Oxford, UK
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Balabanski DL, Minkova A, Rainovski GI, Danchev M, Erduran N, Akkus B, Bostan M, Gurdal G, Yalcinkaya M, Beetge R, Fearick RW, Mabala G, Roux D, Whittaker W, Babu BRS, Lawrie JJ, Naguleswaran S, Newman RT, Pilcher JV, Smit FD, Sharpey-Schafer JF. Study of Mass A=130 Fission Fragments in the 14n + 238U Reaction at 10 MeV/A. The Nucleus 2000. [DOI: 10.1007/978-1-4615-4257-5_9] [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: 11/29/2022] Open
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