$^{52}$ Ti中$α$ + $^{48}$ Ca团簇结构高节带态的存在
Existence of higher nodal band states with $α$+$^{48}$Ca cluster structure in $^{52}$Ti
摘要：
它表明，最近观察到的$α$集团状态的几个MeV以上的$α$阈值能量在$^{52}$ Ti对应于更高的节带态的$α$ + $^{48}$ Ca集团结构，即振动模式，其中集团间的相对运动被激发。除了在$^{20}$ Ne和$^{44}$ Ti中的已知的较高节点态之外，在$^{48}$ Ca核心区域中的较高节点态的存在加强了即使在具有$jj$ -壳层闭合核心的中等质量核中由于成团而引起的振动运动概念的重要性。根据Pauli原理，用Luneburg透镜状深局域势统一描述了$^{52}$ Ti中的高节带和壳状基态带，解释了$α$ + $^{48}$ Ca散射中低能后向角反常（反常大角度散射）、中能前彩虹和高能核彩虹的出现.不可避免地预测到，在地带和高节带之间的中间存在类似于$^{44}$ Ti的$K=0^-$ $α$簇带。
英文摘要：
It is shown that recently observed $α$ cluster states a few MeV above the $α$ threshold energy in $^{52}$Ti correspond to the higher nodal band states with the $α$+$^{48}$Ca cluster structure, i.e. a vibrational mode in which the intercluster relative motion is excited. The existence of the higher nodal states in the $^{48}$Ca core region in addition to the well-known higher nodal states in $^{20}$Ne and $^{44}$Ti reinforces the importance of the concept of vibrational motion due to clustering even in medium-weight nuclei with a $jj$-shell closed core. The higher nodal band and the shell-like ground band in $^{52}$Ti are described in a unified way by a Luneburg lens-like deep local potential due to the Pauli principle, which explains the emergence of backward angle anomaly (anomalous large angle scattering (ALAS)) at low energies, prerainbows at intermediate energies and nuclear rainbows at high energies in $α$+$^{48}$Ca scattering. The existence of a $K=0^-$ $α$ cluster band analog to $^{44}$Ti midway between the ground band and the higher nodal band is inevitably predicted.
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