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PhysRevC.93.024322.pdf | 1.06 MB | Adobe PDF | 見る/開く |
タイトル: | Isovector and isoscalar dipole excitations in [9]Be and [10]Be studied with antisymmetrized molecular dynamics |
著者: | Kanada-En'yo, Yoshiko |
著者名の別形: | 延與, 佳子 |
発行日: | 29-Feb-2016 |
出版者: | American Physical Society |
誌名: | Physical Review C - Nuclear Physics |
巻: | 93 |
号: | 2 |
論文番号: | 024322 |
抄録: | Isovector and isoscalar dipole excitations in [9]Be and [10]Be are investigated in the framework of antisymmetrized molecular dynamics, in which angular-momentum and parity projections are performed. In the present method, 1p-1h excitation modes built on the ground state and a large amplitude α-cluster mode are taken into account. The isovector giant dipole resonance (GDR) in E>20 MeV shows the two-peak structure, which is understood from the dipole excitation in the 2α core part with the prolate deformation. Because of valence neutron modes against the 2α core, low-energy E1 resonances appear in E<20 MeV, exhausting about 20% of the Thomas-Reiche-Kuhn sum rule and 10% of the calculated energy-weighted sum. The dipole resonance at E∼15 MeV in [10]Be can be interpreted as the parity partner of the ground state having a [6]He+α structure and has remarkable E1 strength because of the coherent contribution of two valence neutrons. The isoscalar dipole strength for some low-energy resonances is significantly enhanced by the coupling with the α-cluster mode. For the E1 strength of [9]Be, the calculation overestimates the energy-weighted sum (EWS) in the low-energy (E<20 MeV) and GDR (20<E<50 MeV) regions by a factor of 1.6 and underestimates the width of the GDR, whereas it reasonably describes the GDR energy and also the ratio of the EWS in the low-energy region to that of the GDR region. |
著作権等: | © 2016 American Physical Society. |
URI: | http://hdl.handle.net/2433/218373 |
DOI(出版社版): | 10.1103/PhysRevC.93.024322 |
出現コレクション: | 学術雑誌掲載論文等 |
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