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Isoscalar dipole transition as a probe for asymmetric clustering
| Title: | Isoscalar dipole transition as a probe for asymmetric clustering |
| Authors: | Chiba, Y. Browse this author | | Kimura, M. Browse this author →KAKEN DB | | Taniguchi, Y. Browse this author |
| Issue Date: | 18-Mar-2016 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical review C |
| Volume: | 93 |
| Issue: | 3 |
| Start Page: | 034319 |
| Publisher DOI: | 10.1103/PhysRevC.93.034319 |
| Abstract: | 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. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/61498 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 木村 真明
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