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Isoscalar dipole transition as a probe for asymmetric clustering

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PhysRevC.93.034319.pdf534.6 kBPDF見る/開く
この文献へのリンクには次のURLを使用してください:http://hdl.handle.net/2115/61498

タイトル: Isoscalar dipole transition as a probe for asymmetric clustering
著者: Chiba, Y. 著作を一覧する
Kimura, M. 著作を一覧する
Taniguchi, Y. 著作を一覧する
発行日: 2016年 3月18日
出版者: American Physical Society (APS)
誌名: Physical review C
巻: 93
号: 3
開始ページ: 034319
出版社 DOI: 10.1103/PhysRevC.93.034319
抄録: Background: The sharp 1(-) resonances with enhanced isoscalar dipole transition strengths are observed in many light nuclei at relatively small excitation energies, but their nature has been unclear. Purpose: We show those resonances can be attributed to the cluster states with asymmetric configurations such as alpha + O-16. We explain why asymmetric cluster states are strongly excited by the isoscalar dipole transition. We also provide a theoretical prediction of the isoscalar dipole transitions in Ne-20 and Ti-44. Method: The transition matrix is analytically derived to clarify the excitation mechanism. The nuclear model calculations by Brink-Bloch wave function and antisymmetrized molecular dynamics are also performed to provide a theoretical prediction for Ne-20 and Ti-44. Results: It is shown that the transition matrix is as large as the Weisskopf estimate even though the ground state is an ideal shell-model state. Furthermore, it is considerably amplified if the ground state has cluster correlation. The nuclear model calculations predict large transition matrix to the a + O-16 and a + Ca-40 cluster states comparable with or larger than the Weisskopf estimate. Conclusions: We conclude that the asymmetric cluster states are strongly excited by the isoscalar dipole transition. Combined with the isoscalar monopole transition that populates the 0(+) cluster states, the isoscalar transitions are promising probes for asymmetric clusters.
資料タイプ: article
URI: http://hdl.handle.net/2115/61498
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 木村 真明

 

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