Pairing Forces Govern Population of Doubly Magic 54Ca from Direct Reactions
Pairing Forces Govern Population of Doubly Magic 54Ca from Direct Reactions
复制标题
配对力通过直接反应控制双魔 54Ca 的数量
DOI：
10.1103/physrevlett.126.252501
复制
发表时间：
2021
影响因子：
8.6
通讯作者：
他
中科院分区：
文献类型：
--
作者：
Browne F.、Chen S.、Doornenbal P.、Obertelli A.、Ogata K.、Utsuno Y.、Yoshida K.、Achouri N.L.、Baba H.、Calvet D.、Chateau F.、Chiga N.、Corsi A.、Cortes M.L.、Delbart A.、Gheller J-M.、Kondo Y.;他
在RIKEN放射性同位素束工厂研究了直接质子敲除反应。通过射线和不变质量谱研究的布居态。从核壳层模型采用现象学的核子间相互作用计算能级能量。理论截面的状态计算从扭曲波脉冲近似估计乘以壳模型光谱因子，描述的波函数重叠的基态状态。尽管计算表明基态的激发中子组态有显著的振幅，但价质子的去除主要分布在基态。这种违反直觉的结果是由于配对效应导致的基态光谱因子的主导地位。由于配对相互作用的普遍性，这一论点应该普遍适用于从奇-偶到偶-偶核的直接敲除反应。
Direct proton-knockout reactions ofatwere studied at the RIKEN Radioactive Isotope Beam Factory. Populated states ofwere investigated through-ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological internucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors, which describe the wave function overlap of theground state with states in. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of, valence proton removals populated predominantly the ground state of. This counterintuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.