Shell structure from 100Sn to 78Ni: Implications for nuclear astrophysics
Shell structure from 100Sn to 78Ni: Implications for nuclear astrophysics
复制标题
从 100Sn 到 78Ni 的壳结构：对核天体物理学的影响
DOI：
10.1140/epjad/i2005-06-025-1
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Sawicka
中科院分区：
文献类型：
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作者：
H. Grawe;A. Blazhev;M. Górska;I. Mukha;C. Plettner;E. Roeckl;F. Nowacki;R. Grzywacz;M. Sawicka
摘要：100 Sn的单粒子结构和壳层间隙是从资历和自旋间隙异构体的即时在束和延迟γ射线光谱推断出来的。最近的结果在94，95银和98镉应力的重要性，大规模的壳模型计算采用现实的相互作用的异构性，np-nh激发和E2极化的100锡核心。在100 Sn以下的N = 51同位素中，Δl = 0自旋翻转伙伴πg9/2- νg7/2的强相互作用在Δl = 1 πf5/2- νg9/2核子对中得到了回应，这对78 Ni中N = 50壳层能隙的持续性是决定性的。这一点得到了最近有关70，76 Ni，78 Zn的实验数据的证实。讨论了中子驱动壳演化对丰中子核中新壳层闭合的重要性以及对N = 82壳层附近r过程丰度的影响。
Abstract.The single-particle structure and shell gap of 100Sn is inferred from prompt in-beam and delayed γ-ray spectroscopy of seniority and spin-gap isomers. Recent results in 94, 95Ag and 98Cd stress the importance of large-scale shell model calculations employing realistic interactions for the isomerism, np-nh excitations and E2 polarisation of the 100Sn core. The strong monopole interaction of the Δl = 0 spin-flip partners πg9/2- νg7/2 in N = 51 isotones below 100Sn is echoed in the Δl = 1 πf5/2- νg9/2 pair of nucleons, which is decisive for the persistence of the N = 50 shell gap in 78Ni. This is corroborated by recent experimental data on 70, 76Ni, 78Zn. The importance of monopole driven shell evolution for the appearance of new shell closures in neutron-rich nuclei and implications for r-process abundances near the N = 82 shell is discussed.