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Sun, Bao Yuan; Toki, Hiroshi; Meng, Jie; Meng, J , Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
Relativistic description of BCS-BEC crossover in nuclear matter
发表期刊PHYSICS LETTERS B
关键词Mean-field Theory Neutron Drip-line State Properties Halo Li-11 Superconductivity Superfluidity He-6 Pair
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.
2010
ISSN0370-2693
卷号683期号:40942页码:134-139
学科领域Physics
收录类别SCI
项目资助者Major State Basic Research Development Program[2007CB815000]; National Natural Science Foundation of China[10975008 and 10775004] ; Major State Basic Research Development Program[2007CB815000]; National Natural Science Foundation of China[10975008 and 10775004] ; Major State Basic Research Development Program[2007CB815000]; National Natural Science Foundation of China[10975008 and 10775004] ; Major State Basic Research Development Program[2007CB815000]; National Natural Science Foundation of China[10975008 and 10775004]
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被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5178
专题理论物理所科研产出_SCI论文
通讯作者Meng, J , Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
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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.
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