Observation of low- and high-energy Gamow-Teller phonon excitations in nuclei.
Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 "f-shell" nuclei in ((3)He, t) charge-exchange reactions. In the (42)Ca → (42)Sc reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the (54)Fe → (54)Co reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan and Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
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Fujita
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Fujita
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Adachi
Department of Physics, Sichuan University, Chengdu 610065, China.
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Bai
Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain and Institute for Nuclear Research (MTA-Atomki), H-4001 Debrecen, Post Office Box 51, Hungary.
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Algora
Department of Physics and JINA, University of Notre Dame, Notre Dame, Indiana 46556, USA.
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Berg
Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.
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von Brentano
Dipartimento di Fisica, Università degli Studi di Milano, and INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy.
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Colò
Institute for Nuclear Research (MTA-Atomki), H-4001 Debrecen, Post Office Box 51, Hungary.
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Csatlós
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
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Deaven
Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain.
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Estevez-Aguado
Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.
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Fransen
Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, B-9000 Gent, Belgium.
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De Frenne
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Fujita
Department of Physics, Istanbul University, Istanbul 34134, Turkey.
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Ganioğlu
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
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Guess
Institute for Nuclear Research (MTA-Atomki), H-4001 Debrecen, Post Office Box 51, Hungary.
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Gulyás
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Hatanaka
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Hirota
Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan.
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Honma
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Ishikawa
Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, B-9000 Gent, Belgium.
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Jacobs
Institute for Nuclear Research (MTA-Atomki), H-4001 Debrecen, Post Office Box 51, Hungary.
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Krasznahorkay
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Matsubara
RIKEN, Nishina Center, Wako Saitama 351-0198, Japan and Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.
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Matsuyanagi
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
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Meharchand
Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain.
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Molina
Department of Physics, Tokyo Institute of Technology, Ohokayama, Meguro, Tokyo 152-8551, Japan.
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Muto
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Nakanishi
Horia Hulubei National Institute for Physics and Nuclear Engineering, 077125 Bucharest-Magurele, Romania.
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Negret
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Okamura
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Ong
Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan.
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Otsuka
Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.
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Pietralla
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA and Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA.
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Perdikakis
SCK-CEN, Belgian Nuclear Research Center, B-2400 Mol, Belgium.
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Popescu
Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain.
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Rubio
Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan and RIKEN, Nishina Center, Wako Saitama 351-0198, Japan.
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Sagawa
Instituto de Estructura de la Materia, IEM-CSIC, Serrano 123, E-28006 Madrid, Spain.
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Sarriguren
Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.
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Scholl
Graduate School of Science and Technology, Niigata University, Nishi, Niigata 950-2181, Japan.
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Shimbara
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Shimizu
Department of Physics, Istanbul University, Istanbul 34134, Turkey.
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Susoy
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Suzuki
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Tameshige
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Tamii
Institut für Kernphysik, Westfälische Wilhelms-Universität, D-48149 Münster, Germany.
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Thies
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Uchida
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Wakasa
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Yosoi
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
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Zegers
Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.
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Zell
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Zenihiro