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arXiv 2408.02173nucl-th
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对当前生成坐标法实现的批判性评估

A critical assessment of the current implementations of the Generator Coordinate Method

University of Washington(华盛顿大学)

Aurel Bulgac

AI总结:

本文提出增强GCM方法,以克服原有GCM的缺陷,用于重离子反应和核分裂的微观描述。

摘要:

生成坐标法(GCM)于1950年代由Wheeler及其同事独立提出,并已成为处理核大振幅集体运动(LACM)的主要近似方法之一。GCM受20世纪20年代后期分子和凝聚态物理中类似方法的启发,当时薛定谔方程成为描述量子现象的首选工具。1983年Reinhard、Cusson和Goeke提出的GCM扩展引发了近年来的兴趣。然而,这种新的时间依赖GCM(TDGCM)框架存在缺陷,阻碍了其正确描述许多预期特征,特别是干涉和纠缠,这些在核分裂和多核子转移反应中可能起重要作用。本文提出了一种替代方法,即增强GCM(eGCM),该方法避免了先前GCM实现中遇到的困难,并且适用于重离子反应中的核分裂和多核子转移,可用于静态或时间依赖的eGCM框架。在eGCM框架中,相应的多体波函数具有更复杂的结构,该框架等价于核反应中的连续配置相互作用(CI)方法。eGCM旨在用于重离子反应和核分裂的微观描述。

英文摘要:

The generator coordinate method (GCM) was introduced in nuclear physics by Wheeler and independently by Peierls and their collaborators in 1950s and it is still one of the most used approximations for treating nuclear large-amplitude collective motion. GCM was inspired by similar methods introduced in molecular and condensed-matter physics in the late 1920s, after the Schrödinger equation became the tool of choice to describe quantum phenomena. The interest in the 1983 extension of GCM suggested by Reinhard, Cusson, and Goeke, which includes the internal excitations (absent in the initial GCM formulation), was revived in recent years. Unfortunately, this newer version of the time-dependent GCM framework has flaws that prevent it from describing correctly many anticipated features, in particular interference and entanglement, which can play an important role in fission and many-nucleon transfer reactions. I present here an alternative formulation, the enhanced GCM (eGCM), which is free of the difficulties encountered in previous GCM implementations and which is relevant for fission and many-nucleon transfer in heavy-ion reactions, and which can be used in either static or time-dependent eGCM formulations. In the eGCM framework, the corresponding many-body wave functions have a much more complex structure, and this framework is equivalent to a configuration-interaction approach in the continuum for nuclear reactions. The eGCM is aimed at being used in the microscopic description of heavy-ion reactions and fission in particular. ....

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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