论文标题
$^{43} $ s的外壳结构和$ n = 28 $ shell关闭的崩溃
Shell structure of $^{43}$S and collapse of the $N=28$ shell closure
论文作者
论文摘要
$ n = 27 $的单粒子结构从双重魔术$^{48} $ ca向滴水线中提供了富含中子核的壳演变的见解。 $^{43} $ s通过放射性$^{44} $ s beam的单中性敲除反应进行了研究。使用迅速和延迟$γ$ -Ray光谱的组合，阐明了$^{43} $ s的级别结构。分析动量分布并允许进行旋转和平等分配。推导的光谱因子表明，$^{44} $ s地面配置具有强大的入侵者组件。结果使用两个有效的相互作用面对壳模型计算。在计算之间发现了一般协议，但是在实验中从$ 2p_ {3/2} $轨道中取出中子的国家人口的大量人数表明，$ n = 28 $魔术数的崩溃比理论计算的速度快。
The single-particle structure of the $N=27$ isotones provides insights into the shell evolution of neutron-rich nuclei from the doubly-magic $^{48}$Ca toward the drip line. $^{43}$S was studied employing the one-neutron knockout reaction from a radioactive $^{44}$S beam. Using a combination of prompt and delayed $γ$-ray spectroscopy the level structure of $^{43}$S was clarified. Momentum distributions were analyzed and allowed for spin and parity assignments. The deduced spectroscopic factors show that the $^{44}$S ground-state configuration has a strong intruder component. The results were confronted with shell model calculations using two effective interactions. General agreement was found between the calculations, but strong population of states originating from the removal of neutrons from the $2p_{3/2}$ orbital in the experiment indicates that the breakdown of the $N=28$ magic number is more rapid than the theoretical calculations suggest.
