Study of the Gamow-Teller resonance in 90Nb and 208Bi |
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| Affiliation: | 1. Cyclotron Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-01, Japan;2. Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156, Japan;1. Physics Department, University of Pretoria, P Bag X20, Pretoria, 0002, South Africa;2. iThemba LABS TAMS, National Research Foundation, P Bag 11, WITS, 2050, Johannesburg, South Africa;3. Physics Department, Tshwane University of Technology, P Bag X680, Pretoria, 0001, South Africa;1. Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan;2. Institute of Environmental Engineering, National Yang Ming Chiao Tung University, Hsinchu, 300, Taiwan;3. Focused Photonics (Hangzhou), Inc., Hangzhou, 310052, China;4. Mechanical Engineering Department, University of Minnesota, Minneapolis, MN, 55455, USA;5. School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China;1. Department of Electrical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran;2. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran;1. Friedrich Schiller University, Institute of Inorganic and Analytical Chemistry, Lessingstrasse 8, 07743 Jena, Germany;2. Jena University Hospital, Department of Anesthesiology and Intensive Care Medicine/Center for Sepsis Control and Care, Friedrich Schiller University, Erlanger Allee 101, 07747 Jena, Germany;3. Friedrich Schiller University, Institute of Inorganic and Analytical Chemistry, Humboldtstrasse 8, 07743 Jena, Germany;4. Pharmaceutical Chemistry I, Institute of Pharmacy, Rheinische Friedrich Wilhelms University, Brühler Strasse 7, 53119 Bonn, Germany |
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| Abstract: | An approach is proposed for studying the spreading properties of the Gamow-Teller resonance (GTR) in heavy nuclei including the coupling to 2p2h configurations and the ground-state correlations beyond RPA. The GTR is generated by a proton p-neutron h (πp-νh) phonon within the renormalized RPA. The second-order configuration mixing beyond RPA is realized by constructing two-phonon configurations, in which one of two intermediate phonon states is a πp-νh phonon. The numerical calculations are performed in the parent nuclei 90Zr and 208Pb making use of M3Y nucleon-nucleon interaction and the single-particle wave functions obtained in the standard harmonic oscillator potential. The single-particle energies around the Fermi surface are substituted with the empirical values or those given by a Woods-Saxon potential. The results obtained provide a reasonable account for recent experimental findings on the GTR in these nuclei. The extension of the present approach to highly excited (hot) nuclei is also provided. The GTR is found to be stable against temperatures up to T = 6 MeV. |
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