Nuclear spin features relevant to ab initio nucleon-nucleus elastic scattering
Nuclear spin features relevant to ab initio nucleon-nucleus elastic scattering
复制标题
与从头开始核子-核弹性散射相关的核自旋特征
DOI：
10.1103/physrevc.103.054314
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发表时间：
2021
影响因子：
3.1
通讯作者：
Weppner, S. P.
中科院分区：
文献类型：
--
作者：
Baker, R. B.;Burrows, M.;Elster, Ch.;Launey, K. D.;Maris, P.;Popa, G.;Weppner, S. P.
背景：有效的相互作用的弹性核子-核散射的第一性原理需要使用相同的核子-核子相互作用的结构和反应的计算，以及一致的治疗的相关运营商在每个order.Purpose：以前的工作使用这些相互作用已经显示出良好的协议与现有的数据。在这里，我们研究了这些算子之一的物理相关性，它涉及到被撞击的核子的自旋，并在核结构context.Methods：使用旁观者展开的框架和无核壳模型的基本框架，我们计算和研究自旋投影，核态中有效的核子-核相互作用所需的单体动量分布。计算的自旋投影，单体动量分布，并显示基于质子和中子在单粒子水平上占据的特征行为，其中一种类型的核子越多，产生的动量分布值越大。此外，我们发现这个量是强相关的激发态的磁矩在基态转动带为each nucleus considered.Conclusions：我们发现自旋投影，单体动量分布可以探测自旋内容的波函数。这一特征可能使未来的核子-核子散射研究能够为核子-核子相互作用的自旋性质提供信息。所观察到的激发态磁矩的相关性说明了反应观测值（如分析功率）与结构观测值（如磁矩）之间的先前未知联系。
Background:Effective interactions for elastic nucleon-nucleus scattering from first principles require the use of the same nucleon-nucleon interaction in the structure and reaction calculations, as well as a consistent treatment of the relevant operators at each order.Purpose:Previous work using these interactions has shown good agreement with available data. Here, we study the physical relevance of one of these operators, which involves the spin of the struck nucleon, and examine the interpretation of this quantity in a nuclear structure context.Methods:Using the framework of the spectator expansion and the underlying framework of the no-core shell model, we calculate and examine spin-projected, one-body momentum distributions required for effective nucleon-nucleus interactions innuclear states.Results:The calculated spin-projected, one-body momentum distributions for,, anddisplay characteristic behavior based on the occupation of protons and neutrons in single-particle levels, with more nucleons of one type yielding momentum distributions with larger values. Additionally, we find this quantity is strongly correlated to the magnetic moment of theexcited state in the ground state rotational band for each nucleus considered.Conclusions:We find that spin-projected, one-body momentum distributions can probe the spin content of awave function. This feature may allow futureab initionucleon-nucleus scattering studies to inform spin properties of the underlying nucleon-nucleon interactions. The observed correlation to the magnetic moment of excited states illustrates a previously unknown connection between reaction observables such as the analyzing power and structure observables like the magnetic moment.