Shell evolution in neutron-rich carbon isotopes: Unexpected enhanced role of neutron-neutron correlation

被引：18
|
作者：
Yuan, C. X. [1 ]
Qi, C. [1 ,2 ]
Xu, F. R. [1 ,3 ]
机构：
[1] Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China
[2] AlbaNova Univ Ctr, KTH Royal Inst Technol, SE-10691 Stockholm, Sweden
[3] Natl Lab Heavy Ion Phys, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China
来源：
NUCLEAR PHYSICS A | 2012年 / 883卷
基金：
瑞典研究理事会; 中国国家自然科学基金;
关键词：
Shell model; Shell evolution; N=14 shell; Carbon isotopes; MODEL; NUCLEI; TRANSITIONS; STABILITY; STATES;
D O I：
10.1016/j.nuclphysa.2012.04.003
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Full shell-model diagonalization has been performed to study the structure of neutron-rich nuclei around C-20. We investigate in detail the roles played by the different monopole components of the effective interaction in the evolution of the N = 14 shell in C, N and O isotopes. It is found that the relevant neutron neutron monopole terms, V-d5/2d5/2(nn) and V-s1/2s1/2(nn) contribute significantly to the reduction of the N = 14 shell gap in C and N isotopes in comparison with that in O isotopes. The origin of this unexpectedly large effect, which is comparable with (sometimes even larger than) that caused by the proton neutron interaction, is related to the enhanced configuration mixing in those nuclei due to many-body correlations. Such a scheme is also supported by the large B(E2) value in the nucleus C-20 which has been measured recently. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：25 / 34
页数：10
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