Chapter 3 Alpha-Cluster Study of ^<40>Ca and ^<44>Ti bh the (^<6>Li, d) Reaction
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概要
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Alpha-cluster states in ^<40>Ca, ^<44>Ti and ^<94>Mo have been investigated by the ^<36>Ar(^<6>Li,d)^<40>Ca at E=50 MeV, the ^<40>Ca(^<6>Li,d)^<44>Ti reaction at E=50 and 37 MeV and the ^<90>Zr(^<6>Li,d)^<94>Mo reaction at E=37 MeV. Parity-doublet bands in ^<40>Ca and ^<44>Ti have been successfully established, while the trial to obtain the angular distributions of the ^<90>Zr(^<6>Li,d)^<94>Mo reaction was unsuccessful. This report reviews our experimental search for the α-clustering states in A-^^>40 nuclei. For the ^<44>Ti nucleus, the angular distributions of positive-parity members of the groundstate band (the K^π=0^+ band) in ^<44>Ti were well reproduced by the finite-range distortedwave Born approximation calculations up to the transferred angular momentum of L=8. The members of the negative-parity band (the K^π=0^- band) with the principal quantum number N=13 were fragmented into several levels. The summed spectroscopic factors for each spin give reasonable values as the α-clustering structure. The strongly excited state at E_x=10.86 MeV by the 37 MeV experiment was found to be a candidate for the head of the higher-nodal K^π=0^+ band with N=14. For the ^<40>Ca nucleus, the J^π=8^+ state was found at 10.34 MeV, and the 6.93 MeV level was confirmed as a J^π=6^+ state. These states are considered as the members of the K^π=0^+ band starting from the 0^+ state at E_x=3.35 MeV. The members of the negative-parity counterpart in the parity doublet bands were observed, in some fragments, from the 1^- state at 8.15 MeV to the 7^- state ar 13.83 MeV of excitation energy. Members of the K^π=2^+ band with excited ^<36>Ar core (2^+) and π-cluster, were also observed. The 0^+, 2^+,4^+ and 6^+ members of a higher-nodal K^π=0^+band with N = 14 were observed.They are also fragmented into strongly populated states in an excitation energy region from the 0^+ state at 11 MeV to the 6^+ state at 15 MeV. The large spectroscopic factors suggest a much stronger α-clustering character.The existence of a negative-parity band and the completion of the parity-doublet bands in ^<40>Ca and ^<44>Ti give considerable support to α-cluster models for nuclei heavier than A = 40.
- 理論物理学刊行会の論文
- 1999-03-26
著者
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大久保 茂男
高知女子大学生活科学部環境理学科
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FUJIWARA Mamoru
Research Center for Nuclear Physics, Osaka University
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Fujiwara Mamoru
Reseach Center For Nuclear Physics Osaka University
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Fujiwara Mamoru
Research Center For Nuclear Physics Osaka University : Advanced Science Research Center Jaeri
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OHKUBO Shigeo
Department of Applied Science and Environment, Kochi Women's University
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YAMAYA Takashi
Department of Physics, Tohoku University
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KATORI Kenji
Department of Physics, Osaka University
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KATO Seigo
Department of Physics, Yamagata University
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加藤 進
National Institute Of Advanced Industrial Science And Technology
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Katori K
Department Of Physics Osaka University
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Katori Kenji
Department Of Physics Faculty Of Science University Tokyo
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Ohkubo Shigeo
Department Of Applied Science And Environment Kochi Women's University
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Yamaya Takashi
Department Of Physics Faculty Of Science Tohoku University
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Yamaya Takashi
Department Of Physics Tohoku University
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大久保 茂男
県立高知女子大学環境理学科
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Kato S
National Institute Of Advanced Industrial Science And Technology
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OHKUBO Shigeo
Department of Applied Science and Environment, Kochi Women's University
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OHKUBO Shigeo
Department of Applied Science, Kochi Women's University
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OHKUBO Shigeo
Department of Physics, Kyoto University /Department of Physics and Atomic Energy Research Institute, Nihon University
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