ß - -delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes
ß - -delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes
复制标题
- 富中子钽核的延迟光谱：富中子钨同位素的形状演化
DOI：
10.1103/physrevc.80.064308
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发表时间：
2009
影响因子：
3.1
通讯作者：
Alkhomashi N
中科院分区：
文献类型：
--
作者：
Alkhomashi N
在 GSI 碎片分离器的天然铍靶上，每核子 1 GeV 的主束射弹破碎后产生的富中子母核衰变后，对 的低位结构进行了研究。使用重离子关联和位置敏感硅探测器装置，测量了 、 和 的衰变半衰期，以及它们各自 W 子核中低位态的射线衰变。这些数据提供了 、 和 中低位激发态的信息，突出显示了与较轻的 W 同位素相比核形状的变化。沿着W同位素链的基态结构的这种演变被讨论作为190区域可能的质子亚壳层效应的证据，并且与周围核势的软度最大化一致。
The low-lying structure ofhas been studied followingdecays of the neutron-rich mother nucleiproduced following the projectile fragmentation of a 1-GeV-per-nucleonprimary beam on a natural beryllium target at the GSI Fragment Separator. The-decay half-lives of,, andhave been measured, with-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ioncorrelations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in,, and, which highlight a change in nuclear shape atcompared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the190 region and is consistent with maximization of the-softness of the nuclear potential around.