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Cluster states and isoscalar monopole transitions of Mg-24

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Title: Cluster states and isoscalar monopole transitions of Mg-24
Authors: Chiba, Y. Browse this author
Kimura, M. Browse this author →KAKEN DB
Issue Date: 4-Jun-2015
Publisher: American Physical Society
Journal Title: Physical review C
Volume: 91
Issue: 6
Start Page: 061302-1
Publisher DOI: 10.1103/PhysRevC.91.061302
Abstract: Background: Isoscalar monopole transition has been suggested as a key observable to search for exotic cluster states. Recently, excited 0(+) states with strong isoscalar monopole transition strengths were experimentally reported in Mg-24, but their structures were not revealed because of the lack of theoretical analysis. Purpose: We study the structure of the excited 0(+) states of Mg-24 populated by isoscalar monopole transition from the ground state, and identify their cluster configurations. Method: The 0(+) states of Mg-24 and their isoscalar monopole transition strengths from the ground state are calculated with antisymmetrized molecular dynamics combined with the generator coordinate method using the Gogny D1S interaction. Results: The calculated isoscalar monopole strength function shows reasonable agreement with experiment and is consistent with other theoretical calculations. The structures of the excited 0(+) states with pronounced isoscalar monopole transitions are analyzed. It is found that the 0(2)(+), 0(3)(+), and 0(5)(+) states have mixed nature of mean-field and cluster, and that the 0(8)(+) state is dominated by a C-12 + C-12 cluster configuration. In addition, it is predicted that 5 alpha-pentagon + alpha states appear around 23 MeV. Conclusions: The excited 0(+) states which appear as the prominent peaks in the calculated strength function are associated with Ne-20 + alpha, C-12 + C-12, and 5 alpha-pentagon+alpha cluster states.
Rights: ©2013 American Physical Society
Type: article
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)

Submitter: 木村 真明

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