Observability of Modified Threshold Behavior Near Unitarity

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Few-Body Systems Pub Date : 2025-09-06 DOI:10.1007/s00601-025-02007-6

Michael D. Higgins, J. Golak, R. Skibiński, K. Topolnicki, H. Witała, H. Kamada, Chris H. Greene

引用次数: 0

Abstract

A number of recent references have pointed out that an N-particle system having short-range interactions at S-wave and/or P-wave unitarity can exhibit modified threshold behavior for various reactive processes. But the question of how close to unitarity one must get in order to observe such modifications has not been addressed. The present study quantifies this question by treating cases involving 3- or 4-neutrons, at the physical value of the neutron-neutron singlet scattering length \(a_{s}\) and at artificially altered values. One major conclusion is that the neutron-neutron scattering length is not yet sufficiently large for the 3n or 4n systems to demonstrate the unitarity threshold exponent.

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修正阈值行为的近统一性观察性

最近的一些文献指出，在s波和/或p波统一处具有短程相互作用的n粒子系统可以在各种反应过程中表现出修改的阈值行为。但是，为了观察到这种变化，人们必须多接近于统一，这个问题还没有得到解决。本研究通过处理涉及3或4个中子的情况、中子-中子单重态散射长度\(a_{s}\)的物理值和人为改变的值来量化这个问题。一个主要的结论是，对于3n或4n系统，中子-中子散射长度还不够大，不足以证明统一阈值指数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Few-Body Systems 物理-物理：综合

CiteScore

2.90

自引率

18.80%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Few-Body Systems presents original research work – experimental, theoretical and computational – investigating the behavior of any classical or quantum system consisting of a small number of well-defined constituent structures. The focus is on the research methods, properties, and results characteristic of few-body systems. Examples of few-body systems range from few-quark states, light nuclear and hadronic systems; few-electron atomic systems and small molecules; and specific systems in condensed matter and surface physics (such as quantum dots and highly correlated trapped systems), up to and including large-scale celestial structures. Systems for which an equivalent one-body description is available or can be designed, and large systems for which specific many-body methods are needed are outside the scope of the journal. The journal is devoted to the publication of all aspects of few-body systems research and applications. While concentrating on few-body systems well-suited to rigorous solutions, the journal also encourages interdisciplinary contributions that foster common approaches and insights, introduce and benchmark the use of novel tools (e.g. machine learning) and develop relevant applications (e.g. few-body aspects in quantum technologies).