Single-neutron knockout from 20C and the structure of 19C

被引：17

作者：

Hwang, J. W. ^{[1
]}

Kim, S. ^{[1
]}

Satou, Y. ^{[1
]}

Orr, N. A. ^{[2
,3
]}

Kondo, Y. ^{[4
]}

Nakamura, T. ^{[4
]}

Gibelin, J. ^{[2
,3
]}

Achouri, N. L. ^{[2
,3
]}

Aumann, T. ^{[5
,6
,7
]}

Baba, H. ^{[8
]}

Delaunay, F. ^{[2
,3
]}

Doornenbal, P. ^{[8
]}

Fukuda, N. ^{[8
]}

Inabe, N. ^{[8
]}

Isobe, T. ^{[8
]}

Kameda, D. ^{[8
]}

Kanno, D. ^{[4
]}

Kobayashi, N. ^{[4
]}

Kobayashi, T. ^{[9
]}

Kubo, T. ^{[8
]}

Leblond, S. ^{[2
,3
]}

Lee, J. ^{[8
,14
]}

Marques, F. M. ^{[2
,3
]}

Minakata, R. ^{[4
]}

Motobayashi, T. ^{[8
]}

Murai, D.

Murakami, T. ^{[10
]}

Muto, K. ^{[9
]}

Nakashima, T. ^{[4
]}

Nakatsuka, N. ^{[10
]}

Navin, A. ^{[11
]}

Nishi, S. ^{[4
]}

Ogoshi, S. ^{[4
]}

Otsu, H. ^{[8
]}

Sato, H. ^{[8
]}

Shimizu, Y. ^{[8
]}

Suzuki, H. ^{[8
]}

Takahashi, K. ^{[9
]}

Takeda, H. ^{[8
]}

Takeuchi, S. ^{[8
]}

Tanaka, R. ^{[4
]}

Togano, Y. ^{[6
,7
]}

Tuff, A. G. ^{[12
]}

Vandebrouck, M. ^{[13
]}

Yoneda, K. ^{[8
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, 1 Gwanak Ro, Seoul 08826, South Korea

[2] UNICAEN, ENSICAEN, LAC Caen, IN2P3,CNRS, F-14050 Caen, France

[3] Normandie Univ, F-14050 Caen, France

[4] Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-10 Okayama, Tokyo 1528551, Japan

[5] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[6] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[7] GSI Helmholtzzentrum Schwerionenforsch GmbH, Res Div, D-64291 Darmstadt, Germany

[8] RIKEN, Nishina Ctr, Hirosawa 2-1, Wako, Saitama 3510198, Japan

[9] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[10] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[11] CEA, IN2P3, CNRS, GANIL,DRF, F-14076 Caen 5, France

[12] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[13] Univ Paris Sud, Inst Phys Nucl, IN2P3, CNRS, F-91406 Orsay, France

[14] Univ Hong Kong, Dept Phys, Pokfulam Rd, 15 Hong Kong, Hong Kong, Peoples R China

来源：

PHYSICS LETTERS B | 2017年 / 769卷

关键词：

Heavy-ion knockout; Invariant mass spectroscopy; Shell evolution; ENERGY-LEVELS; LIGHT-NUCLEI; SHELL-MODEL; EXCITED-STATES; HALO; MASS; RIKEN; CODE;

D O I：

10.1016/j.physletb.2017.04.019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The low-lying unbound level structure of the halo nucleus C-19 has been investigated using single-neutron knockout from C-20 on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the forward going beam velocity C-18 fragment and neutrons, was found to be dominated by a very narrow near threshold (E-rel = 0.036(1) MeV) peak. Two less strongly populated resonance like features were also observed at E-rel = 0.84(4) and 2.31(3) MeV, both of which exhibit characteristics consistent with neutron p-shell hole states. Comparisons of the energies, measured cross sections and parallel momentum distributions to the results of shell-model and eikonal reaction calculations lead to spin-parity assignments of 5/2(1)(+) and 1/2(1)(-) for the levels at E-x = 0.62(9) and 2.89(10) MeV with S-n = 0.58(9) MeV. Spectroscopic factors were also deduced and found to be in reasonable accord with shell-model calculations. The valence neutron configuration of the C-20 ground state is thus seen to include, in addition to the known 1s(1/2)(2) component, a significant 0d(5/2)(2) contribution. The level scheme of C-19, including significantly the 1/2(1)(-) cross-shell state, is well accounted for by the YSOX shell-model interaction developed from the monopole-based universal interaction. (C) 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.

引用

页码：503 / 508

页数：6

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