Evidence for an l=0 ground state in 9He

被引：78

作者：

Chen, L ^{[1
]}

Blank, B

Brown, BA

Chartier, M

Galonsky, A

Hansen, PG

Thoennessen, M

机构：

[1] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[4] CEN Bordeaux Gradignan, F-33175 Gradignan, France

来源：

PHYSICS LETTERS B | 2001年 / 505卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

stripping reactions with radioactive nuclear beams; He-9 ground state;

D O I：

10.1016/S0370-2693(01)00313-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The unbound nuclear systems Li-10 and He-9 were produced in direct reactions of 28 MeV/u Be-11 incident on a Be-9 target, The distributions of the observed velocity differences between the neutron and the charged fragment show a strong influence of final-state interactions. Since the neutron originates in a dominant I = 0 initial state, a selection-rule argument allows a firm 1 = 0 assignment for the lowest odd-neutron state in Li-10. We report the results suggesting a very similar unbound state in He-9. characterized by an s-wave scattering length more negative than -10 fm corresponding to an energy of the virtual state of less than 0.2 MeV. Shell-model calculations cast light on the reasons for the disappearance of the magic shell gap near the drip line. (C) 2001 Published by Elsevier Science B.V.

引用

页码：21 / 26

页数：6

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