Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81,82,83,84 Zn
Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81,82,83,84 Zn
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Z = 28 和 N = 50 之外的壳层演化：81,82,83,84 Zn 的光谱
DOI：
10.1016/j.physletb.2017.09.001
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发表时间：
2017
影响因子：
4.4
通讯作者：
C. M. Shand et. al.
中科院分区：
文献类型：
--
作者：
R. Nakajima;S. Koyama;M. Kurata-Nishimura;N.Chiga;H. Otsu and X. Sun;C. M. Shand et. al.
本文报道了用束内γ射线能谱法测量富中子81,82,83,84 Zn核的新低洼态。其中82 Zn为41 +→21 +跃迁，84 Zn为21 +→0 g s +和41 +→21 +跃迁，81、83 Zn为首次观察到低潮态。与80 Zn相比，N= 52,54的E（21 +）能量降低，E (41 +)/E（2+）比值增加，证明这种神奇作用仅限于中子数N= 50。将所推导的水平格式与三种最先进的壳模型计算结果进行了比较，结果与三种计算结果吻合较好。在Ni78-II和PFSDG-U模型中，考虑到上部sdg轨道，新观测到的2+和4+水平表明84 Zn开始向更重的Zn同位素变形。
We report on the measurement of new low-lying states in the neutron-rich 81, 82, 83, 84 Zn nuclei via in-beam γ-ray spectroscopy. These include the 4 1+→ 2 1+ transition in 82 Zn, the 2 1+→ 0 g. s.+ and 4 1+→ 2 1+ transitions in 84 Zn, and low-lying states in 81, 83 Zn were observed for the first time. The reduced E (2 1+) energies and increased E (4 1+)/E (2+ 1) ratios at N= 52, 54 compared to those in 80 Zn attest that the magicity is confined to the neutron number N= 50 only. The deduced level schemes are compared to three state-of-the-art shell model calculations and a good agreement is observed with all three calculations. The newly observed 2+ and 4+ levels in 84 Zn suggest the onset of deformation towards heavier Zn isotopes, which has been incorporated by taking into account the upper sdg orbitals in the Ni78-II and the PFSDG-U models.