Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

P. J. Li; J. Lee; P. Doornenbal; S. Chen; S. Wang; A. Obertelli; Y. Chazono; J. D. Holt; B. S. Hu; K. Ogata; Y. Utsuno; K. Yoshida; N. L. Achouri; H. Baba; F. Browne; D. Calvet; F. Château; N. Chiga; A. Corsi; M. L. Cortés; A. Delbart; J. M. Gheller; A. Giganon; A. Gillibert; C. Hilaire; T. Isobe; T. Kobayashi; Y. Kubota; V. Lapoux; H. N. Liu; T. Motobayashi; I. Murray; H. Otsu; V. Panin; N. Paul; W. Rodriguez; H. Sakurai; M. Sasano; D. Steppenbeck; L. Stuhl; Y. L. Sun; Y. Togano; T. Uesaka; K. Wimmer; K. Yoneda; O. Aktas; T. Aumann; K. Boretzky; C. Caesar; L. X. Chung; F. Flavigny; S. Franchoo; I. Gasparic; R. B. Gerst; J. Gibelin; K. I. Hahn; J. Kahlbow; D. Kim; T. Koiwai; Y. Kondo; D. Körper; P. Koseoglou; C. Lehr; B. D. Linh; T. Lokotko; M. MacCormick; K. Miki; K. Moschner; T. Nakamura; S. Y. Park; D. Rossi; E. Sahin; F. Schindler; H. Simon; P. A. Söderström; D. Sohler; S. Takeuchi; H. Toernqvist; J. Tscheuschner; V. Vaquero; V. Wagner; V. Werner; X. Xu; H. Yamada; D. Yan; Z. Yang; M. Yasuda; L. Zanetti

doi:10.1016/j.physletb.2024.138828

Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

P. J. Li^*
, J. Lee^*
, P. Doornenbal
, S. Chen
, S. Wang
, A. Obertelli
, Y. Chazono
, J. D. Holt
, B. S. Hu
, K. Ogata
, Y. Utsuno
, K. Yoshida
, N. L. Achouri
, H. Baba
, F. Browne
, D. Calvet
, F. Château
, N. Chiga
, A. Corsi
, M. L. Cortés

A. Delbart, J. M. Gheller, A. Giganon, A. Gillibert, C. Hilaire, T. Isobe, T. Kobayashi, Y. Kubota, V. Lapoux, H. N. Liu, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl, Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, O. Aktas, T. Aumann, K. Boretzky, C. Caesar, L. X. Chung, F. Flavigny, S. Franchoo, I. Gasparic, R. B. Gerst, J. Gibelin, K. I. Hahn, J. Kahlbow, D. Kim, T. Koiwai, Y. Kondo, D. Körper, P. Koseoglou, C. Lehr, B. D. Linh, T. Lokotko, M. MacCormick, K. Miki, K. Moschner, T. Nakamura, S. Y. Park, D. Rossi, E. Sahin, F. Schindler, H. Simon, P. A. Söderström, D. Sohler, S. Takeuchi, H. Toernqvist, J. Tscheuschner, V. Vaquero, V. Wagner, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, L. Zanetti

^*此作品的通讯作者

CAS - Institute of Modern Physics
The University of Hong Kong
RIKEN
University of York
Technische Universität Darmstadt
Université Paris-Saclay
TRIUMF
McGill University
Oak Ridge National Laboratory
Oak Ridge National Laboratory
Kyushu University
The University of Osaka
Japan Atomic Energy Agency
The University of Tokyo
ISMRA et Université de Caen
Tohoku University
Beijing Normal University
Sorbonne Université
Universidad Javeriana
Universidad Nacional de Colombia
Institute for Nuclear Research
Institute for Basic Science
Rikkyo University
KTH Royal Institute of Technology
GSI Helmholtz Centre for Heavy Ion Research
Vietnam Atomic Energy Institute
Ruder Boskovic Institute
University of Cologne
Ewha Womans University
Institute of Science Tokyo
Vietnam Agency for Radiation and Nuclear Safety
Michigan State University
University of Oslo
Horia Hulubei National Institute of Physics and Nuclear Engineering
Consejo Superior de Investigaciones Científicas

科研成果: 期刊稿件 › 文章 › 同行评审

4 引用（Scopus）

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 ⁵³Ca and ⁵⁵Ca, populated from ^54,56Ca(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 l 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 ⁵³Ca and 6000(250) keV in ⁵⁵Ca indicate a significant l = 3 component, providing the first experimental evidence for the ν0f_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 ν0f_7/2 orbital in ⁵⁵Ca. 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.

源语言	英语
文章编号	138828
期刊	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
卷	855
DOI	https://doi.org/10.1016/j.physletb.2024.138828
出版状态	已出版 - 8月 2024
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Li, P. J., Lee, J., Doornenbal, P., Chen, S., Wang, S., Obertelli, A., Chazono, Y., Holt, J. D., Hu, B. S., Ogata, K., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Corsi, A., ... Zanetti, L. (2024). Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 855, 文章 138828. https://doi.org/10.1016/j.physletb.2024.138828

@article{c4e96e4692d54073bf368d6c2d421450,

title = "Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes",

abstract = "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 53Ca and 55Ca, populated from 54,56Ca(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 l 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 53Ca and 6000(250) keV in 55Ca indicate a significant l = 3 component, providing the first experimental evidence for the ν0f7/2 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 ν0f7/2 orbital in 55Ca. 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.",

keywords = "Knockout reaction, Shell evolution, Single-particle strength, Unbound states",

author = "Li, \{P. J.\} and J. Lee and P. Doornenbal and S. Chen and S. Wang and A. Obertelli and Y. Chazono and Holt, \{J. D.\} and Hu, \{B. S.\} and K. Ogata and Y. Utsuno and K. Yoshida and Achouri, \{N. L.\} and H. Baba and F. Browne and D. Calvet and F. Ch{\^a}teau and N. Chiga and A. Corsi and Cort{\'e}s, \{M. L.\} and A. Delbart and Gheller, \{J. M.\} and A. Giganon and A. Gillibert and C. Hilaire and T. Isobe and T. Kobayashi and Y. Kubota and V. Lapoux and Liu, \{H. N.\} and T. Motobayashi and I. Murray and H. Otsu and V. Panin and N. Paul and W. Rodriguez and H. Sakurai and M. Sasano and D. Steppenbeck and L. Stuhl and Sun, \{Y. L.\} and Y. Togano and T. Uesaka and K. Wimmer and K. Yoneda and O. Aktas and T. Aumann and K. Boretzky and C. Caesar and Chung, \{L. X.\} and F. Flavigny and S. Franchoo and I. Gasparic and Gerst, \{R. B.\} and J. Gibelin and Hahn, \{K. I.\} and J. Kahlbow and D. Kim and T. Koiwai and Y. Kondo and D. K{\"o}rper and P. Koseoglou and C. Lehr and Linh, \{B. D.\} and T. Lokotko and M. MacCormick and K. Miki and K. Moschner and T. Nakamura and Park, \{S. Y.\} and D. Rossi and E. Sahin and F. Schindler and H. Simon and S{\"o}derstr{\"o}m, \{P. A.\} and D. Sohler and S. Takeuchi and H. Toernqvist and J. Tscheuschner and V. Vaquero and V. Wagner and V. Werner and X. Xu and H. Yamada and D. Yan and Z. Yang and M. Yasuda and L. Zanetti",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s)",

year = "2024",

month = aug,

doi = "10.1016/j.physletb.2024.138828",

language = "英语",

volume = "855",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Li, PJ, Lee, J, Doornenbal, P, Chen, S, Wang, S, Obertelli, A, Chazono, Y, Holt, JD, Hu, BS, Ogata, K, Utsuno, Y, Yoshida, K, Achouri, NL, Baba, H, Browne, F, Calvet, D, Château, F, Chiga, N, Corsi, A, Cortés, ML, Delbart, A, Gheller, JM, Giganon, A, Gillibert, A, Hilaire, C, Isobe, T, Kobayashi, T, Kubota, Y, Lapoux, V, Liu, HN, Motobayashi, T, Murray, I, Otsu, H, Panin, V, Paul, N, Rodriguez, W, Sakurai, H, Sasano, M, Steppenbeck, D, Stuhl, L, Sun, YL, Togano, Y, Uesaka, T, Wimmer, K, Yoneda, K, Aktas, O, Aumann, T, Boretzky, K, Caesar, C, Chung, LX, Flavigny, F, Franchoo, S, Gasparic, I, Gerst, RB, Gibelin, J, Hahn, KI, Kahlbow, J, Kim, D, Koiwai, T, Kondo, Y, Körper, D, Koseoglou, P, Lehr, C, Linh, BD, Lokotko, T, MacCormick, M, Miki, K, Moschner, K, Nakamura, T, Park, SY, Rossi, D, Sahin, E, Schindler, F, Simon, H, Söderström, PA, Sohler, D, Takeuchi, S, Toernqvist, H, Tscheuschner, J, Vaquero, V, Wagner, V, Werner, V, Xu, X, Yamada, H, Yan, D, Yang, Z, Yasuda, M & Zanetti, L 2024, 'Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷 855, 138828. https://doi.org/10.1016/j.physletb.2024.138828

TY - JOUR

T1 - Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

AU - Li, P. J.

AU - Lee, J.

AU - Doornenbal, P.

AU - Chen, S.

AU - Wang, S.

AU - Obertelli, A.

AU - Chazono, Y.

AU - Holt, J. D.

AU - Hu, B. S.

AU - Ogata, K.

AU - Utsuno, Y.

AU - Yoshida, K.

AU - Achouri, N. L.

AU - Baba, H.

AU - Browne, F.

AU - Calvet, D.

AU - Château, F.

AU - Chiga, N.

AU - Corsi, A.

AU - Cortés, M. L.

AU - Delbart, A.

AU - Gheller, J. M.

AU - Giganon, A.

AU - Gillibert, A.

AU - Hilaire, C.

AU - Isobe, T.

AU - Kobayashi, T.

AU - Kubota, Y.

AU - Lapoux, V.

AU - Liu, H. N.

AU - Motobayashi, T.

AU - Murray, I.

AU - Otsu, H.

AU - Panin, V.

AU - Paul, N.

AU - Rodriguez, W.

AU - Sakurai, H.

AU - Sasano, M.

AU - Steppenbeck, D.

AU - Stuhl, L.

AU - Sun, Y. L.

AU - Togano, Y.

AU - Uesaka, T.

AU - Wimmer, K.

AU - Yoneda, K.

AU - Aktas, O.

AU - Aumann, T.

AU - Boretzky, K.

AU - Caesar, C.

AU - Chung, L. X.

AU - Flavigny, F.

AU - Franchoo, S.

AU - Gasparic, I.

AU - Gerst, R. B.

AU - Gibelin, J.

AU - Hahn, K. I.

AU - Kahlbow, J.

AU - Kim, D.

AU - Koiwai, T.

AU - Kondo, Y.

AU - Körper, D.

AU - Koseoglou, P.

AU - Lehr, C.

AU - Linh, B. D.

AU - Lokotko, T.

AU - MacCormick, M.

AU - Miki, K.

AU - Moschner, K.

AU - Nakamura, T.

AU - Park, S. Y.

AU - Rossi, D.

AU - Sahin, E.

AU - Schindler, F.

AU - Simon, H.

AU - Söderström, P. A.

AU - Sohler, D.

AU - Takeuchi, S.

AU - Toernqvist, H.

AU - Tscheuschner, J.

AU - Vaquero, V.

AU - Wagner, V.

AU - Werner, V.

AU - Xu, X.

AU - Yamada, H.

AU - Yan, D.

AU - Yang, Z.

AU - Yasuda, M.

AU - Zanetti, L.

PY - 2024/8

Y1 - 2024/8

N2 - 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 53Ca and 55Ca, populated from 54,56Ca(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 l 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 53Ca and 6000(250) keV in 55Ca indicate a significant l = 3 component, providing the first experimental evidence for the ν0f7/2 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 ν0f7/2 orbital in 55Ca. 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.

AB - 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 53Ca and 55Ca, populated from 54,56Ca(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 l 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 53Ca and 6000(250) keV in 55Ca indicate a significant l = 3 component, providing the first experimental evidence for the ν0f7/2 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 ν0f7/2 orbital in 55Ca. 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.

KW - Knockout reaction

KW - Shell evolution

KW - Single-particle strength

KW - Unbound states

UR - https://www.scopus.com/pages/publications/85197177196

U2 - 10.1016/j.physletb.2024.138828

DO - 10.1016/j.physletb.2024.138828

M3 - 文章

AN - SCOPUS:85197177196

SN - 0370-2693

VL - 855

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138828

ER -

Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

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