Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg
Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg
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DOI：
10.1016/j.physletb.2018.05.064
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发表时间：
2017-09
影响因子：
4.4
通讯作者：
J. Henderson;G. Hackman;P. Ruotsalainen;Steven Ragnar Stroberg;K. Launey;F. A. Ali;N. Bernier;
中科院分区：
文献类型：
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作者：
J. Henderson;G. Hackman;P. Ruotsalainen;Steven Ragnar Stroberg;K. Launey;F. A. Ali;N. Bernier;
[zh]利用微观或手性势的多体核理论已经发展到可以在微观或从头算框架内研究集体性而无需使用有效电荷的程度；例如，通过 E2 算子的正确演化，或者通过使用适当且可管理的粒子空穴激发子集。我们通过库仑激发精确测定 22 Mg 及其镜像 22 Ne 中的 E2 强度，从而可以与理论进行严格比较。进行了无核辛壳模型计算并与新的 B (E 2) 值一致，而介质内相似性重正化组计算始终低估了绝对强度，发现缺失的强度同时具有等标量和等矢量分量。两个微观模型之间的差异证明了 E2 强度对所采用的多体近似选择的敏感性。
[en] Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be studied within a microscopic or ab initio framework without the use of effective charges; for example with the proper evolution of the E2 operator, or alternatively, through the use of an appropriate and manageable subset of particle–hole excitations. We present a precise determination of E2 strength in 22 Mg and its mirror 22 Ne by Coulomb excitation, allowing for rigorous comparisons with theory. No-core symplectic shell-model calculations were performed and agree with the new B (E 2) values while in-medium similarity-renormalization-group calculations consistently underpredict the absolute strength, with the missing strength found to have both isoscalar and isovector components. The discrepancy between two microscopic models demonstrates the sensitivity of E2 strength to the choice of many-body approximation employed.