Low-lying level structure of the neutron-unbound N=7 isotones

被引：6

作者：

Votaw, D. ^{[1
,2
,16
]}

DeYoung, P. A. ^{[3
]}

Baumann, T. ^{[1
]}

Blake, A. ^{[4
]}

Boone, J. ^{[5
]}

Brown, J. ^{[6
]}

Chrisman, D. ^{[1
,2
]}

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

Frank, N. ^{[8
]}

Gombas, J. ^{[3
]}

Gueye, P. ^{[1
,4
]}

Hinnefeld, J. ^{[9
]}

Karrick, H. ^{[8
,17
]}

Kuchera, A. N. ^{[10
]}

Liu, H. ^{[1
,2
]}

Luther, B. ^{[11
]}

Ndayisabye, F. ^{[1
,2
]}

Neal, M. ^{[4
]}

Owens-Fryar, J. ^{[12
]}

Pereira, J. ^{[1
]}

Persch, C. ^{[3
]}

Phan, T. ^{[10
]}

Redpath, T. ^{[1
,2
]}

Rogers, W. F. ^{[13
]}

Stephenson, S. ^{[14
]}

Stiefel, K. ^{[1
,15
]}

Sword, C. ^{[3
]}

Wantz, A. ^{[5
]}

Thoennessen, M. ^{[1
,2
,18
]}

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] Hope Coll, Dept Phys, Holland, MI 49422 USA

[4] Hampton Univ, Dept Phys, Hampton, VA 23668 USA

[5] Indiana Wesleyan Univ, Div Nat Sci, Marion, IN 46953 USA

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

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

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

[9] Indiana Univ, Dept Phys & Astron, South Bend, IN 46615 USA

[10] Davidson Coll, Dept Phys, Davidson, NC 28035 USA

[11] St Johns Coll, Dept Phys, Annapolis, MD 21401 USA

[12] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA

[13] Indiana Wesleyan Univ, Phys Dept, Marion, IN 46953 USA

[14] Gettysburg Coll, Dept Phys, Gettysburg, PA 17325 USA

[15] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

[16] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[17] Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA

[18] Amer Phys Soc, Ridge, NY 11961 USA

来源：

PHYSICAL REVIEW C | 2020年 / 102卷 / 01期

基金：

美国国家科学基金会;

关键词：

EXOTIC NUCLEI; LI-10; SPECTROSCOPY; ISOTOPES; STATES; MASS; POPULATION; KNOCKOUT; SYSTEM;

D O I：

10.1103/PhysRevC.102.014325

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：

This article reports on results of an experimental search for ground state shell inversion in the neutron-unbound N = 7 isotones He-9 and Li-10. Two different radioactive ion beams (Be-11, E-lab = 44 MeV/u and B-12, E-lab = 45 MeV/u) impinging on a beryllium target were used to directly and selectively populate unbound states of a given l in the nuclides of interest. Be(Be-11, He-8 +n) and Be(B-12, He-8 +n) reactions populated unbound states in He-9. Fragments and neutrons were detected in coincidence to reconstruct the decay energy of He-9 using invariant mass spectroscopy. Similarly, Be(Be-11, Li-9 +n) and Be(B-12, Li-9 +n) reactions were used to populate unbound states in Li-10, and the time-of-flight method was used to determine the relative velocity of the Li-9 fragments and neutrons in coincidence. Various states in both He-9 and Li-10 were observed and characterized. The data indicate possible ground state shell inversion in both cases.

引用

页数：8

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