中子共振间距中跨壳层贡献的不可或缺性
Indispensability of cross-shell contributions in neutron resonance spacing
AI总结：
本研究利用谱分布方法计算了跨壳层激发下的核能级密度，并确定了s波中子共振间距，证明了跨壳层贡献对于解释实验数据不可或缺。
摘要：
利用一种数值高效的谱分布方法，为组态相互作用壳模型获得了依赖于自旋和宇称的核能级密度（NLDs）。使用包含从sd到pf壳层跨壳层激发的全sd-pf模型空间，对$^{24}$Na、$^{25,26,27}$Mg核进行了计算。所得的NLDs随后被用于确定s波中子共振间距（D$_0$），这是预测天体物理反应率的关键输入之一。尽管所考虑的核并非丰中子核，但来自到pf壳层的跨壳层激发的贡献对于解释D$_0$的实验数据是不可或缺的，否则会显著高估。
英文摘要：
Spin and parity dependent nuclear level densities (NLDs) are obtained for configuration interaction shell model using a numerically efficient spectral distribution method. The calculations are performed for $^{24}$Na, $^{25,26,27}$Mg nuclei using full $sd$-$pf$ model space that incorporates the cross-shell excitations from $sd$ to $pf$-shell. The NLDs so obtained are then employed to determine the s-wave neutron resonance spacing (D$_0$) which is one of the crucial inputs for the predictions of astrophysical reaction rates. Though the considered nuclei are not neutron-rich, the contributions from cross-shell excitations to $pf$-shell are indispensable to explain the experimental data for D$_0$ which otherwise are significantly overestimated.
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