Relativistic description of BCS-BEC crossover in nuclear matter
文献类型：期刊论文
| 作者 | 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
 |
| 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 |
| 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 |
| 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. |
入库方式： OAI收割
来源：理论物理研究所
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