论文标题
n = 81核中的中子孔强度
Neutron-hole strength in N = 81 nuclei
论文作者
论文摘要
报告了N = 81核137BA，139CE，141ND和143SM中中子孔强度的系统研究。分别以23和34 MEV的能量测量了单中性去除反应（P，D）和（3HE，4HE）。通过扭曲的波生近似分析从测得的横截面中提取光谱因子，并确定了单粒子强度的质心。这些质心能量随质子数的函数的变化与S1/2和H11/2轨道的单极移位的计算进行了比较，在该轨道上观察到了大多数强度。对于D和G7/2轨道，观察到强度的显着碎片，特别是对于深层结合的后者轨道，其强度的总和表明大量含量位于测得的激发能量范围之外。
A systematic study of neutron-hole strength in the N = 81 nuclei 137Ba, 139Ce, 141Nd and 143Sm is reported. The single-neutron removal reactions (p,d) and (3He,4He) were measured at energies of 23 and 34 MeV, respectively. Spectroscopic factors were extracted from measured cross sections through a distorted-wave Born approximation analysis and centroids of single-particle strength have been established. The change in these centroid energies as a function of proton number have been compared to calculations of the monopole shift for the s1/2 and h11/2 orbitals, where the majority of the strength has been observed. Significant fragmentation of strength was observed for the d and g7/2 orbitals, particularly for the latter orbital which is deeply bound, with summed strengths that indicate a significant amount lies outside of the measured excitation energy range.
