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. ChigaA. 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

Departamento de Física

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5 Citas (Scopus)

Resumen

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.

Idioma original	Inglés
Número de artículo	138025
Número de páginas	7
Publicación	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volumen	843
DOI	https://doi.org/10.1016/j.physletb.2023.138025 https://doi.org/10.1016/j.physletb.2023.138025
Estado	Publicada - 10 ago. 2023

Palabras clave

Shell evolution
Gamma Ray spectroscopy

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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, Artículo 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 -