Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

被引：1

作者：

Li, P. J. ^{[1
,2
]}

Lee, J. ^{[2
]}

Doornenbal, P. ^{[3
]}

Chen, S. ^{[2
,3
,4
]}

Wang, S. ^{[1
]}

Obertelli, A. ^{[3
,5
,6
]}

Chazono, Y. ^{[3
]}

Holt, J. D. ^{[7
,8
]}

Hu, B. S. ^{[7
,9
,10
]}

Ogata, K. ^{[11
,12
]}

Utsuno, Y. ^{[13
,14
]}

Yoshida, K. ^{[13
]}

Achouri, N. L. ^{[15
]}

Baba, H. ^{[3
]}

Browne, F. ^{[3
]}

Calvet, D. ^{[6
]}

Chateau, F. ^{[6
]}

Chiga, N. ^{[3
]}

Corsi, A. ^{[6
]}

Cortes, M. L. ^{[3
]}

Delbart, A. ^{[6
]}

Gheller, J. -M. ^{[6
]}

Giganon, A. ^{[6
]}

Gillibert, A. ^{[6
]}

Hilaire, C. ^{[6
]}

Isobe, T. ^{[3
]}

Kobayashi, T. ^{[16
]}

Kubota, Y. ^{[3
,14
]}

Lapoux, V. ^{[6
]}

Liu, H. N. ^{[5
,17
]}

Motobayashi, T. ^{[3
]}

Murray, I. ^{[3
,19
]}

Otsu, H. ^{[3
]}

Panin, V. ^{[3
]}

Paul, N. ^{[6
,20
]}

Rodriguez, W. ^{[3
,21
,22
]}

Sakurai, H. ^{[3
,23
]}

Sasano, M. ^{[3
]}

Steppenbeck, D. ^{[3
]}

Stuhl, L. ^{[24
,25
]}

Sun, Y. L. ^{[5
,6
]}

Togano, Y. ^{[3
,26
]}

Uesaka, T. ^{[3
]}

Wimmer, K. ^{[3
,23
]}

Yoneda, K. ^{[3
]}

Aktas, O. ^{[18
]}

Aumann, T. ^{[5
,27
]}

Boretzky, K. ^{[27
]}

Caesar, C. ^{[3
,5
,27
]}

Chung, L. X. ^{[28
]}

机构：

[1] Chinese Acad Sci, Inst Modern Phys, CAS Key Lab High Precis Nucl Spect, Lanzhou 730000, Peoples R China

[2] Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong, Peoples R China

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

[4] Univ York, Sch Phys Engn & Technol, York YO10 5DD, N Yorkshire, England

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

[6] Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France

[7] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

[8] McGill Univ, Dept Phys, Quebec City, PQ H3A 2T8, Canada

[9] Oak Ridge Natl Lab, Natl Ctr Computat Sci, Oak Ridge, TN 37831 USA

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

[11] Kyushu Univ, Dept Phys, Fukuoka 8190395, Japan

[12] Osaka Univ, RCNP, Ibaraki, Japan

[13] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[14] Univ Tokyo, Ctr Nucl Study, RIKEN Campus, Wako, Saitama 3510198, Japan

[15] Univ Caen Normandie, ENSICAEN, LPC Caen UMR6534, CNRS,IN2P3, F-14000 Caen, France

[16] Tohoku Univ, Dept Phys, Sendai 9808578, Japan

[17] Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Beam Technol, Minist Educ, Beijing 100875, Peoples R China

[18] Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden

[19] Univ Paris Saclay, IJCLab, CNRS, IN2P3, F-91405 Orsay, France

[20] Sorbonne Univ, PSL Res Univ, Coll France, Lab Kastler Brossel,CNRS,ENS, Case 74,4 Pl Jussieu, F-75005 Paris, France

[21] Pontificia Univ Javeriana, Fac Ciencias, Dept Fis, Bogota, Colombia

[22] Univ Nacl Colombia, Sede Bogota, Fac Ciencias, Dept Fis, Bogota 111321, Colombia

[23] Univ Tokyo, Dept Phys, 7-3-1 Hongo,Bunkyo, Tokyo 1130033, Japan

[24] Inst Nucl Res, POB 51, H-4001 Debrecen, Hungary

[25] Inst for Basic Sci Korea, Daejeon 34126, South Korea

[26] Rikkyo Univ, Dept Phys, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan

[27] GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, F-64291 Darmstadt, Germany

[28] VINATOM, Inst Nucl Sci & Technol, 179 Hoang Quoc Viet, Hanoi, Vietnam

[29] Rudjer Boskovic Inst, Bijenicka Cesta 54, Zagreb 10000, Croatia

[30] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[31] Ewha Womans Univ, Seoul 03760, South Korea

[32] Tokyo Inst Technol, Dept Phys, 2-12-1 O-Okayama, Tokyo, 1528551, Japan

[33] Vietnam Agcy Radiat & Nucl Safety, 113 Tran Duy Hung, Hanoi, Vietnam

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

[35] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[36] Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH, Extreme Light Infrastruct Nucl Phys ELI NP, Str Reactorulu, Magurele 077125, Romania

[37] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

来源：

PHYSICS LETTERS B | 2024年 / 855卷

基金：

日本学术振兴会; 中国博士后科学基金; 加拿大自然科学与工程研究理事会;

关键词：

Unbound states; Knockout reaction; Single-particle strength; Shell evolution; SHELL-MODEL; KNOCKOUT;

D O I：

10.1016/j.physletb.2024.138828

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well studied, probing the structure of deeply bound nucleons remains a challenge. Here, we report on the first measurement of unbound states in Ca-53 and (55) Ca, populated from (54,56) Ca( p, pn) reactions at a beam energy of around 216 MeV/nucleon at the RIKEN Radioactive Isotopes Beam Factory. The resonance properties, partial cross sections, and momentum distributions of these unbound states were analyzed. Orbital angular momentum I assignments were extracted from momentum distributions based on calculations using the distorted wave impulse approximation (DWIA) reaction model. The resonances at excitation energies of 5516(41) keV in (53) Ca and 6000(250) keV in (55) Ca indicate a significant l = 3 component, providing the first experimental evidence for the v(0) f (7/2) single-particle strength of unbound hole states in the neutron-rich Ca isotopes. The observed excitation energies and cross-sections point towards extremely localized and well separated strength distributions, with some fragmentation for the v(0) f (7/2) orbital in (55) Ca. These results are in good agreement with predictions from shell-model calculations using the effective GXPF1Bs interaction and ab initio calculations and diverge markedly from the experimental distributions in the nickel isotones at Z = 28.

引用

页数：11

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