Collective multipole excitations of exotic nuclei in relativistic continuum random phase approximation

Collective multipole excitations of exotic nuclei in relativistic continuum random phase approximation
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相对论连续随机相位近似中奇异核的集体多极激发

DOI:
10.1088/1674-1137/37/12/124102
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发表时间:
2013-09
期刊:
影响因子:
3.6
通讯作者:
Ma Zhongyu
Ma Zhongyu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
YANG Ding;Cao Ligang;Ma Zhongyu

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在完全自洽的相对论连续谱无规相近似(RCRPA)框架下,研究了奇异核的等幅和等矢量集体多极激发。该方法用单粒子绿色函数精确地处理了连续谱对核激发的贡献。与稳定核不同,丰中子核和丰质子核中存在较强的低能激发。中子或质子过剩将强度函数的质心推向较低的能量,并增加强度分布的破碎。文中还讨论了正确处理连续介质贡献的效果。
The isoscalar and isovector collective multipole excitations in exotic nuclei are studied in the framework of a fully self-consistent relativistic continuum random phase approximation (RCRPA). In this method the contribution of the continuum spectrum to nuclear excitations is treated exactly by the single particle Green's function. Different from the cases in stable nuclei, there are strong low-energy excitations in neutron-rich nuclei and proton-rich nuclei. The neutron or proton excess pushes the centroid of the strength function to lower energies and increases the fragmentation of the strength distribution. The effect of treating the contribution of continuum exactly is also discussed.
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