Identification of deformed intruder states in semi-magic 70Ni
Identification of deformed intruder states in semi-magic 70Ni
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DOI：
10.1103/physrevc.91.044309
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发表时间：
2015-04-13
影响因子：
3.1
通讯作者：
Zhu, S.
中科院分区：
文献类型：
--
作者：
Chiara, C. J.;Weisshaar, D.;Zhu, S.
通过互补多核转移反应和二次碎裂反应研究了半魔Ni-70（28）42的结构。根据观测到的伽马射线符合关系，将自旋更高的假定负宇称态改变为中子f（5/2）pg（9/2）模型空间中使用有效相互作用的壳模型计算结果更好地吻合。然而，第二个2（+）和（4（+））状态，只能成功地描述时，质子激发跨越Z = 28壳层间隙包括在内。蒙特卡罗壳模型计算表明，后两个状态是一个长形变入侵序列的一部分，建立一个实例的形状共存在低激发能量类似于最近在相邻的Ni-68。
The structure of semi-magic Ni-70(28)42 was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed gamma-ray coincidence relationships result in better agreement with shell-model calculations using effective interactions in the neutron f(5/2)pg(9/2) model space. The second 2(+) and (4(+)) states, however, can only be successfully described when proton excitations across the Z = 28 shell gap are included. Monte Carlo shell-model calculations suggest that the latter two states are part of a prolate-deformed intruder sequence, establishing an instance of shape coexistence at low excitation energies similar to that observed recently in neighboring Ni-68.