Relativistic description of BCS-BEC crossover in nuclear matter

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	Relativistic description of BCS-BEC crossover in nuclear matter
	Sun, Bao Yuan; Toki, Hiroshi; Meng, Jie; Meng, J , Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
刊名	PHYSICS LETTERS B
	2010
卷号	683 期号:40942 页码:134-139
关键词	Mean-field Theory Neutron Drip-line State Properties Halo Li-11 Superconductivity Superfluidity He-6 Pair
ISSN号	0370-2693
英文摘要	We study theoretically the di-neutron spatial correlations and the crossover from superfluidity of neutron Cooper pairs in the (1)S(0) pairing channel to Bose-Einstein condensation (BEC) of di-neutron pairs for both symmetric and neutron matter in the microscopic relativistic pairing theory. We take the bare nucleon-nucleon interaction Bonn-B in the particle-particle channel and the effective interaction PK1 of the relativistic mean-field approach in the particle-hole channel. It is found that the spatial structure of neutron Cooper pair wave function evolves continuously from BCS-type to BEC-type as density decreases. We see a strong concentration of the probability density revealed for the neutron pairs in the fairly small relative distance around 1.5 fm and the neutron Fermi momentum k(Fn) is an element of [0.6, 1.0] fm(-1). However, from the effective chemical potential and the quasiparticle excitation spectrum, there is no evidence for the appearance of a true BEC state of neutron pairs at any density. The most BEC-like state may appear at k(Fn) - 0.2 fm(-1) by examining the density correlation function. From the coherence length and the probability distribution of neutron Cooper pairs as well as the ratio between the neutron pairing gap and the kinetic energy at the Fermi surface, some features of the BCS-BEC crossover are seen in the density regions, 0.05 fm(-1) < k(Fn) < 0.7 (0.75) fm(-1), for the symmetric nuclear (pure neutron) matter. (C) 2009 Elsevier B.V. All rights reserved.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000274421100010
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5178]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Meng, J , Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
推荐引用方式 GB/T 7714	Sun, Bao Yuan,Toki, Hiroshi,Meng, Jie,et al. Relativistic description of BCS-BEC crossover in nuclear matter[J]. PHYSICS LETTERS B,2010,683(40942):134-139.
APA	Sun, Bao Yuan,Toki, Hiroshi,Meng, Jie,&Meng, J , Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China.(2010).Relativistic description of BCS-BEC crossover in nuclear matter.PHYSICS LETTERS B,683(40942),134-139.
MLA	Sun, Bao Yuan,et al."Relativistic description of BCS-BEC crossover in nuclear matter".PHYSICS LETTERS B 683.40942(2010):134-139.