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题名: Relativistic description of BCS-BEC crossover in nuclear matter
作者: Sun, Bao Yuan ;  Toki, Hiroshi ;  Meng, Jie
刊名: PHYSICS LETTERS B
出版日期: 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
学科分类: Physics
通讯作者: Meng, J , Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
部门归属: [Meng, J] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China; [Sun, BY; Toki, H; Meng, J] Peking Univ, Sch Phys, Beijing 100871, Peoples R China; [Sun, BY; Toki, H; Meng, J] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China; [Sun, BY; Toki, H] Osaka Univ, RCNP, Osaka 5670047, Japan; [Meng, J] Univ Stellenbosch, Dept Phys, ZA-7600 Stellenbosch, South Africa; [Meng, J] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; [Meng, J] Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China
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.
资助者: Major State Basic Research Development Program[2007CB815000]; National Natural Science Foundation of China[10975008 and 10775004]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000274421100010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5178
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Sun, Bao Yuan,Toki, Hiroshi,Meng, Jie. Relativistic description of BCS-BEC crossover in nuclear matter[J]. PHYSICS LETTERS B,2010,683(40942):134-139.
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