Level structures of 56,58Ca cast doubt on a doubly magic 60Ca

S. Chen; F. Browne; P. Doornenbal; J. Lee; A. Obertelli; Y. Tsunoda; T. Otsuka; Y. Chazono; G. Hagen; J. D. Holt; G. R. Jansen; K. Ogata; N. Shimizu; Y. Utsuno; K. Yoshida; N. L. Achouri; H. Baba; 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; L. X. Chung; F. Flavigny; S. Franchoo; I. Gasparic; R. B. Gerst; J. Gibelin; K. I. Hahn; D. Kim; T. Koiwai; Y. Kondo; P. Koseoglou; C. Lehr; B. D. Linh; T. Lokotko; M. MacCormick; K. Moschner; T. Nakamura; S. Y. Park; D. Rossi; E. Sahin; P. A. Söderström; D. Sohler; S. Takeuchi; H. Törnqvist; V. Vaquero; V. Wagner; S. Wang; V. Werner; X. Xu; H. Yamada; D. Yan; Z. Yang; M. Yasuda; L. Zanetti

doi:10.1016/j.physletb.2023.138025

Level structures of ^56,58Ca cast doubt on a doubly magic ⁶⁰Ca

S. Chen
, F. Browne
, P. Doornenbal
, J. Lee
, A. Obertelli
, Y. Tsunoda
, T. Otsuka
, Y. Chazono
, G. Hagen
, J. D. Holt
, G. R. Jansen
, K. Ogata
, N. Shimizu
, Y. Utsuno
, K. Yoshida
, N. L. Achouri
, H. Baba
, 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, L. X. Chung, F. Flavigny, S. Franchoo, I. Gasparic, R. B. Gerst, J. Gibelin, K. I. Hahn, D. Kim, T. Koiwai, Y. Kondo, P. Koseoglou, C. Lehr, B. D. Linh, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. Y. Park, D. Rossi, E. Sahin, P. A. Söderström, D. Sohler, S. Takeuchi, H. Törnqvist, V. Vaquero, V. Wagner, S. Wang, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, L. Zanetti

Department of Physics

The University of Hong Kong
RIKEN Nishina Center
State Key Laboratory of Nuclear Physics and Technology
Technische Universität Darmstadt
APHP – Paris Saclay University
The University of Tokyo
Japan Atomic Energy Agency
The University of Osaka
University of Tennessee, Knoxville
Oak Ridge National Laboratory
TRIUMF
McGill University
Osaka Prefecture University
Université de Caen
Tohoku University
KTH Royal Institute of Technology
Sorbonne Université
Universidad Nacional de Colombia
MTA Atomki
Institute for Basic Science, Daejeon
Rikkyo University
GSI Helmholtz Centre for Heavy Ion Research
Vietnam Atomic Energy Institute
Ruder Boskovic Institute
University of Cologne
Ewha Womans University
Tokyo Institute of Technology
Vietnam Agency for Radiation and Nuclear Safety
University of Oslo
CSIC - Instituto de Estructura de la Materia (IEM)
CAS - Institute of Modern Physics

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Gamma decays were observed in ⁵⁶Ca and ⁵⁸Ca following quasi-free one-proton knockout reactions from ^57,59Sc beams at ≈200 MeV/nucleon. For ⁵⁶Ca, a γ ray transition was measured to be 1456(12) keV, while for ⁵⁸Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 2₁⁺→0_gs⁺ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 2₁⁺ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f_5/2 and 0g_9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic ⁶⁰Ca and potentially drives the dripline of Ca isotopes to ⁷⁰Ca or even beyond.

Original language	English
Article number	138025
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	843
DOIs	https://doi.org/10.1016/j.physletb.2023.138025 https://doi.org/10.1016/j.physletb.2023.138025
State	Published - 10 Aug 2023

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Chen, S., Browne, F., Doornenbal, P., Lee, J., Obertelli, A., Tsunoda, Y., Otsuka, T., Chazono, Y., Hagen, G., Holt, J. D., Jansen, G. R., Ogata, K., Shimizu, N., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Calvet, D., Château, F., ... Zanetti, L. (2023). Level structures of ^56,58Ca cast doubt on a doubly magic ⁶⁰Ca. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 843, Article 138025. https://doi.org/10.1016/j.physletb.2023.138025, https://doi.org/10.1016/j.physletb.2023.138025

@article{3bb9fe1e363c4476b41dac20d7c40af2,

title = "Level structures of 56,58Ca cast doubt on a doubly magic 60Ca",

abstract = "Gamma decays were observed in 56Ca and 58Ca following quasi-free one-proton knockout reactions from 57,59Sc beams at ≈200 MeV/nucleon. For 56Ca, a γ ray transition was measured to be 1456(12) keV, while for 58Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 21+→0gs+ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 21+ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f5/2 and 0g9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic 60Ca and potentially drives the dripline of Ca isotopes to 70Ca or even beyond.",

keywords = "Shell evolution, Gamma Ray spectroscopy",

author = "S. Chen and F. Browne and P. Doornenbal and J. Lee and A. Obertelli and Y. Tsunoda and T. Otsuka and Y. Chazono and G. Hagen and Holt, \{J. D.\} and Jansen, \{G. R.\} and K. Ogata and N. Shimizu and Y. Utsuno and K. Yoshida and Achouri, \{N. L.\} and H. Baba 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 Chung, \{L. X.\} and F. Flavigny and S. Franchoo and I. Gasparic and Gerst, \{R. B.\} and J. Gibelin and Hahn, \{K. I.\} and D. Kim and T. Koiwai and Y. Kondo and P. Koseoglou and C. Lehr and Linh, \{B. D.\} and T. Lokotko and M. MacCormick and K. Moschner and T. Nakamura and Park, \{S. Y.\} and D. Rossi and E. Sahin and S{\"o}derstr{\"o}m, \{P. A.\} and D. Sohler and S. Takeuchi and H. T{\"o}rnqvist and V. Vaquero and V. Wagner and S. Wang 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} 2023 The Author(s)",

year = "2023",

month = aug,

day = "10",

doi = "10.1016/j.physletb.2023.138025",

language = "English",

volume = "843",

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

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Chen, S, Browne, F, Doornenbal, P, Lee, J, Obertelli, A, Tsunoda, Y, Otsuka, T, Chazono, Y, Hagen, G, Holt, JD, Jansen, GR, Ogata, K, Shimizu, N, Utsuno, Y, Yoshida, K, Achouri, NL, Baba, H, 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, Chung, LX, Flavigny, F, Franchoo, S, Gasparic, I, Gerst, RB, Gibelin, J, Hahn, KI, Kim, D, Koiwai, T, Kondo, Y, Koseoglou, P, Lehr, C, Linh, BD, Lokotko, T, MacCormick, M, Moschner, K, Nakamura, T, Park, SY, Rossi, D, Sahin, E, Söderström, PA, Sohler, D, Takeuchi, S, Törnqvist, H, Vaquero, V, Wagner, V, Wang, S, Werner, V, Xu, X, Yamada, H, Yan, D, Yang, Z, Yasuda, M & Zanetti, L 2023, 'Level structures of ^56,58Ca cast doubt on a doubly magic ⁶⁰Ca', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 843, 138025. https://doi.org/10.1016/j.physletb.2023.138025, https://doi.org/10.1016/j.physletb.2023.138025

TY - JOUR

T1 - Level structures of 56,58Ca cast doubt on a doubly magic 60Ca

AU - Chen, S.

AU - Browne, F.

AU - Doornenbal, P.

AU - Lee, J.

AU - Obertelli, A.

AU - Tsunoda, Y.

AU - Otsuka, T.

AU - Chazono, Y.

AU - Hagen, G.

AU - Holt, J. D.

AU - Jansen, G. R.

AU - Ogata, K.

AU - Shimizu, N.

AU - Utsuno, Y.

AU - Yoshida, K.

AU - Achouri, N. L.

AU - Baba, H.

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 - Chung, L. X.

AU - Flavigny, F.

AU - Franchoo, S.

AU - Gasparic, I.

AU - Gerst, R. B.

AU - Gibelin, J.

AU - Hahn, K. I.

AU - Kim, D.

AU - Koiwai, T.

AU - Kondo, Y.

AU - Koseoglou, P.

AU - Lehr, C.

AU - Linh, B. D.

AU - Lokotko, T.

AU - MacCormick, M.

AU - Moschner, K.

AU - Nakamura, T.

AU - Park, S. Y.

AU - Rossi, D.

AU - Sahin, E.

AU - Söderström, P. A.

AU - Sohler, D.

AU - Takeuchi, S.

AU - Törnqvist, H.

AU - Vaquero, V.

AU - Wagner, V.

AU - Wang, S.

AU - Werner, V.

AU - Xu, X.

AU - Yamada, H.

AU - Yan, D.

AU - Yang, Z.

AU - Yasuda, M.

AU - Zanetti, L.

PY - 2023/8/10

Y1 - 2023/8/10

N2 - Gamma decays were observed in 56Ca and 58Ca following quasi-free one-proton knockout reactions from 57,59Sc beams at ≈200 MeV/nucleon. For 56Ca, a γ ray transition was measured to be 1456(12) keV, while for 58Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 21+→0gs+ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 21+ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f5/2 and 0g9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic 60Ca and potentially drives the dripline of Ca isotopes to 70Ca or even beyond.

AB - Gamma decays were observed in 56Ca and 58Ca following quasi-free one-proton knockout reactions from 57,59Sc beams at ≈200 MeV/nucleon. For 56Ca, a γ ray transition was measured to be 1456(12) keV, while for 58Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 21+→0gs+ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 21+ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f5/2 and 0g9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic 60Ca and potentially drives the dripline of Ca isotopes to 70Ca or even beyond.

KW - Shell evolution

KW - Gamma Ray spectroscopy

UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=pure_puj3&SrcAuth=WosAPI&KeyUT=WOS:001057178900001&DestLinkType=FullRecord&DestApp=WOS

U2 - 10.1016/j.physletb.2023.138025

DO - 10.1016/j.physletb.2023.138025

M3 - Article

AN - SCOPUS:85163193865

SN - 0370-2693

VL - 843

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 - 138025

ER -

Level structures of ^56,58Ca cast doubt on a doubly magic ⁶⁰Ca

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