Extending the Southern Shore of the Island of Inversion to 28F
Extending the Southern Shore of the Island of Inversion to 28F
复制标题
将逆之岛南岸延伸至28F
DOI：
10.1103/physrevlett.124.152502
复制
发表时间：
2020
影响因子：
8.6
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
A. Revel;O. Sorlin;F. M. Marques;Y. Kondo; et al.
在质子/中子从能量约为0的光束中去除后，首次对中子非束缚核进行了详细的光谱分析。重构了非巧合和巧合的不变质谱，发现了一系列定义良好的共振。在两个反应中都观察到一个接近阈值的状态，并被确定为基态，而对衰变通道的分析允许推导出一个相当大的改进。通过与壳层模型预测和eikonal模型反应计算的比较，可以对一些较低能级的。重要的是，在基态的情况下，中子移除后的重建动量分布表明它主要来自中子侵入体构型。这证明了反转岛包括，很可能，并表明它不是双重魔法。
Detailed spectroscopy of the neutron-unbound nucleushas been performed for the first time following proton/neutron removal frombeams at energies around. The invariant-mass spectra were reconstructed for both theandcoincidences and revealed a series of well-defined resonances. A near-threshold state was observed in both reactions and is identified as theground state, with, while analysis of thedecay channel allowed a considerably improvedto be deduced. Comparison with shell-model predictions and eikonal-model reaction calculations have allowed spin-parity assignments to be proposed for some of the lower-lying levels of. Importantly, in the case of the ground state, the reconstructedmomentum distribution following neutron removal fromindicates that it arises mainly from theneutron intruder configuration. This demonstrates that the island of inversion aroundincludes, and most probably, and suggests thatis not doubly magic.