First evidence for a virtual 18B ground state

被引：38

作者：

Spyrou, A. ^{[1
,2
]}

Baumann, T. ^{[1
]}

Bazin, D. ^{[1
]}

Blanchon, G. ^{[3
]}

Bonaccorso, A. ^{[4
]}

Breitbach, E. ^{[5
]}

Brown, J. ^{[6
]}

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

DeLine, A. ^{[7
]}

DeYoung, P. A. ^{[8
]}

Finck, J. E. ^{[7
]}

Frank, N. ^{[9
]}

Mosby, S. ^{[1
,2
]}

Peters, W. A. ^{[10
]}

Russel, A. ^{[7
]}

Schiller, A. ^{[11
]}

Strongman, M. J. ^{[1
,2
]}

Thoennessen, M. ^{[1
,2
]}

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] DIF, DAM, CEA, F-91297 Arpajon, France

[4] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[5] Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA

[6] Wabash Coll, Dept Phys, Crawfordsville, IN 47933 USA

[7] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

[8] Hope Coll, Dept Phys, Holland, MI 49423 USA

[9] Augustana Coll, Dept Phys & Astron, Rock Isl, IL 61201 USA

[10] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[11] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

来源：

PHYSICS LETTERS B | 2010年 / 683卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

Neutron Spectroscopy; Neutron Drip Line; Virtual State; Exotic Nuclei; ATOMIC MASS EVALUATION; EXCITED-STATES; MULTINUCLEON TRANSFER; EXOTIC NUCLEI; LIGHT-NUCLEI; FRAGMENTATION; C-17; C-19; HALO; PROJECTILES; ISOTOPES;

D O I：

10.1016/j.physletb.2009.12.016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decay of the neutron unbound ground state of B-18 was studied for the first time through a single-proton knockout reaction from a 62 MeV/u C-19 beam. The decay energy spectrum was reconstructed from coincidence measurements between the emitted neutron and the B-17 fragment using the MoNA/Sweeper setup. An s-wave line shape was used to describe the experimental spectrum resulting in an upper limit for the scattering length of -50 fm which corresponds to a decay energy <10 keV. Observing an s-wave decay of B-18 provides an experimental verification that the ground state of C-19 includes a large s-wave component. The presence of this s-wave component shows that s-d mixing is still present in B-18 and that the s(1/2) orbital has not moved significantly below the d(5/2) orbital. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：129 / 133

页数：5

共 18 条

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