Charge radii and neutron correlations in helium halo nuclei

被引：55

作者：

Papadimitriou, G. ^{[1
,2
]}

Kruppa, A. T. ^{[1
,3
]}

Michel, N. ^{[4
]}

Nazarewicz, W. ^{[1
,2
,5
]}

Ploszajczak, M. ^{[6
]}

Rotureau, J. ^{[7
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

[3] Inst Nucl Res, H-4001 Debrecen, Hungary

[4] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

[5] Univ Warsaw, Inst Theoret Phys, PL-00681 Warsaw, Poland

[6] CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France

[7] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

来源：

PHYSICAL REVIEW C | 2011年 / 84卷 / 05期

基金：

芬兰科学院;

关键词：

MONTE-CARLO CALCULATIONS; QUANTUM; SCATTERING; HE-6;

D O I：

10.1103/PhysRevC.84.051304

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：

Within the complex-energy configuration-interaction framework, we study correlations of valence neutrons to explain the behavior of charge radii in neutron halo nuclei He-6,He-8. We find that the experimentally observed decrease of the charge radius between He-6 and He-8 is caused by a subtle interplay between three effects: dineutron correlations, a spin-orbit contribution to the charge radius, and a core swelling effect. We demonstrate that two-neutron angular correlations in the 2(1)(+) resonance of He-6 differ markedly from the ground-state correlations in He-6,He-8. Finally, we discuss the impact of the neutron threshold position and valence neutron correlation energy on the neutron radius, i.e., the pairing-antihalo effect.

引用

页数：5

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