Excitation of dipole resonances in He-4 and in the alpha clusters of Li-6 and Li-7
Excitation of dipole resonances in He-4 and in the alpha clusters of Li-6 and Li-7
复制标题
He-4 以及 Li-6 和 Li-7 的 α 簇中偶极子共振的激发
DOI：
10.1103/physrevc.74.014309
复制
发表时间：
2006
影响因子：
3.1
通讯作者：
M. Yosoi
中科院分区：
文献类型：
--
作者：
T. Yamagata;N. Warashina;H. Akimune;S. Asaji;M. Fujiwara;M. Greenfield;H. Hashimoto;R. Hayami;T. Ishida;K. Kawase;M. Kinoshita;T. Kudoh;K. Nakanishi;S. Nakayama;S. Okumura;K. Sagara;Momoko Tanaka;H. Utsunomiya;M. Yosoi
通过使用入射能量为 300 MeV 的 () 反应，研究了由巨偶极共振和自旋偶极共振 (SDR) 组成的等矢量偶极共振 (DR's)。我们将 DR in 的激发能、宽度、共振形状和微分横截面与 DR 的 in 和 进行了比较，后者在早期工作中被观察到并解释为 α 簇中的 DR。 α簇中的 DR 和 中的 DR 分别在 和 MeV 处观察到，宽度分别为 和 MeV。 α 簇中对应于 2SDR 的峰并不像在 atMeV 中观察到的那样占主导地位。 α 簇的共振形状可以用 DR 形状很好地再现，但不包括 2SDR。α 簇中 DR 的激发能随着周围核子数量的增加而略有增加。的 α 团簇中 DR 的激发横截面（标准化为 α 粒子 中的光谱因子）与 中 DR 的激发横截面相当。
The isovector dipole resonances (DR's) consisting of the giant dipole resonance and spin dipole resonance (SDR) inwere investigated by using the () reaction at an incident energy of 300 MeV. We compared the excitation energy, width, resonance shape and the differential cross sections for the DR inwith those for the DR's inandwhich had been observed and interpreted in earlier work as the DR's in the α clusters ofand. The DR's inand in the α clusters ofwere observed at, andMeV with the widths of, andMeV, respectively. The peaks corresponding to the 2SDR in the α cluster were not as dominant as that observed inatMeV. The resonance shapes for the α cluster inwere reproduced well with the DR shape without including the 2SDR in. The excitation energies for the DR's in the α clusters slightly increase with the number of the surrounding nucleons. The cross sections for the excitation of the DR's in the α clusters of, normalized to the spectroscopic factors for the α particle in, are comparable to the cross section for the excitation of the DR in.