In-beam γ -ray spectroscopy of Cr62,64
In-beam
γ
-ray spectroscopy of
Cr62,64
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DOI：
10.1103/physrevc.103.014314
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发表时间：
2021
影响因子：
3.1
通讯作者：
D. Weisshaar
中科院分区：
文献类型：
--
作者：
A. Gade;R. Janssens;Dominique Bazin;P. Farris;A. Hill;S. Lenzi;J. Li;D. Little;B. Longfellow;F. Nowacki;A. Poves;D. Rhodes;J. Tostevin;D. Weisshaar
近年来，由于在中子数 $N=40$ 附近快速聚集，富中子 Cr 同位素区域引起了广泛关注。我们在这里报告了第一个超越 $^{62,64}\mathrm{Cr}$ 中 $({4}_{1}^{+})$ 状态的 $\ensuremath{\gamma}$ 射线光谱，使用稀有同位素束鸡尾酒中的几个射弹的核子去除反应。给出了 $^{64}\mathrm{Cr}$ 中 ${6}^{+}$ 状态的候选状态，以及 $^{62}\mathrm{Cr}$ 中可能的第二激发 ${0}^{+}$ 状态的候选状态。将结果与 LNPS 壳模型预测进行比较进行讨论，LNPS 壳模型预测允许中子激发穿过 $N=40$ 谐振子间隙进入 ${g}_{9/2}$ 和 ${d}_{5/2}$ 轨道。 $^{62,64}\mathrm{Cr}$ 的计算水平方案揭示了有趣的集体结构。根据这些 Cr 同位素中低位态的预测中子粒子空穴特征，$^{62}\mathrm{Cr}$ 作为通往 $N=40$ 反演岛中心的路径上的过渡系统出现。
The region of neutron-rich Cr isotopes has garnered much attention in recent years due to a rapid onset of collectivity near neutron number $N=40$. We report here on the first $\ensuremath{\gamma}$-ray spectroscopy beyond the $({4}_{1}^{+})$ state in $^{62,64}\mathrm{Cr}$, using nucleon removal reactions from several projectiles within a rare-isotope beam cocktail. A candidate for the ${6}^{+}$ state in $^{64}\mathrm{Cr}$ is presented as well as one for, possibly, the second excited ${0}^{+}$ state in $^{62}\mathrm{Cr}$. The results are discussed in comparison to the LNPS shell-model predictions that allow for neutron excitations across the $N=40$ harmonic oscillator gap into the ${g}_{9/2}$ and ${d}_{5/2}$ orbitals. The calculated level schemes for $^{62,64}\mathrm{Cr}$ reveal intriguing collective structures. From the predicted neutron particle-hole character of the low-lying states in these Cr isotopes, $^{62}\mathrm{Cr}$ emerges as a transitional system on the path to the center of the $N=40$ island of inversion.
63 Ni 中的单粒子和集体激发
影响因子：
3.1
作者：
Albers M
通讯作者：
Albers M