α团簇形成与衰变：四体关联与组态混合
Alpha-cluster Formation and Decay: Four-Body Correlation and Configuration Mixing
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中文总结 AI 辅助
本研究通过粒子数投影BCS方法改进四重态波函数方法，纳入配对诱导的组态混合，发现配对增强开壳层核的α团簇形成，闭壳层则抑制该过程。
中文摘要 AI 辅助
α衰变为核结构和底层核子-核子相互作用提供了重要探针，然而从第一性原理出发对其进行的严格微观描述仍然具有挑战性。对于α+幻数核芯系统，通过同时考虑核芯之上的四体关联和泡利阻塞，已经实现了对α团簇形成与衰变的微观处理。将这种微观描述扩展到开壳层核时，需要考虑费米面附近价核子间剩余相互作用引起的组态混合。在本工作中，我们通过使用粒子数投影的巴丁-库珀-施里弗（PBCS）方法纳入配对诱导的组态混合，改进了四重态波函数方法（QWFA）。我们发现，配对增强了开壳层核中α团簇的形成振幅，而闭壳层则抑制了α团簇化。
英文摘要
Alpha-decay provides an important probe of nuclear structure and the underlying nucleon-nucleon interaction, while its rigorous microscopic description from first principles remains challenging. For $α$+magic core systems, a microscopic treatment of $α$-cluster formation and decay has been achieved by considering both the four-body correlation on top of the core and Pauli blocking. Extending this microscopic description to open-shell nuclei should account for the configuration mixing caused by the residual interactions between valence nucleons near the Fermi surface. In this work, we improve the quartetting wave function approach (QWFA) by incorporating the pairing-induced configuration mixing using the particle-number-projected Bardeen-Cooper-Schrieffer (PBCS) method. We find that the pairing enhance the formation amplitudes of the $α$-cluster in open-shell nuclei while the closed shells suppress the $α$-clustering.
发表机构
- School of Physics, Nanjing University（南京大学物理学院）
- China Institute of Atomic Energy（中国原子能科学研究院）
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