Proton Shell Evolution below Sn 132: First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125

Z. Q. Chen; Z. H. Li; H. Hua; H. Watanabe; C. X. Yuan; S. Q. Zhang; G. Lorusso; S. Nishimura; H. Baba; F. Browne; G. Benzoni; K. Y. Chae; F. C.L. Crespi; P. Doornenbal; N. Fukuda; G. Gey; R. Gernhäuser; N. Inabe; T. Isobe; D. X. Jiang; A. Jungclaus; H. S. Jung; Y. Jin; D. Kameda; G. D. Kim; Y. K. Kim; I. Kojouharov; F. G. Kondev; T. Kubo; N. Kurz; Y. K. Kwon; X. Q. Li; J. L. Lou; G. J. Lane; C. G. Li; D. W. Luo; A. Montaner-Pizá; K. Moschner; C. Y. Niu; F. Naqvi; M. Niikura; H. Nishibata; A. Odahara; R. Orlandi; Z. Patel; Zs Podolyák; T. Sumikama; P. A. Söderström; H. Sakurai; H. Schaffner; G. S. Simpson; K. Steiger; H. Suzuki; J. Taprogge; H. Takeda; Zs Vajta; H. K. Wang; J. Wu; A. Wendt; C. G. Wang; H. Y. Wu; X. Wang; C. G. Wu; C. Xu; Z. Y. Xu; A. Yagi; Y. L. Ye; K. Yoshinaga

doi:10.1103/PhysRevLett.122.212502

Proton Shell Evolution below Sn 132: First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125

Z. Q. Chen, Z. H. Li, H. Hua, H. Watanabe, C. X. Yuan, S. Q. Zhang, G. Lorusso, S. Nishimura, H. Baba, F. Browne, G. Benzoni, K. Y. Chae, F. C.L. Crespi, P. Doornenbal, N. Fukuda, G. Gey, R. Gernhäuser, N. Inabe, T. Isobe, D. X. JiangA. Jungclaus, H. S. Jung, Y. Jin, D. Kameda, G. D. Kim, Y. K. Kim, I. Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, X. Q. Li, J. L. Lou, G. J. Lane, C. G. Li, D. W. Luo, A. Montaner-Pizá, K. Moschner, C. Y. Niu, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, T. Sumikama, P. A. Söderström, H. Sakurai, H. Schaffner, G. S. Simpson, K. Steiger, H. Suzuki, J. Taprogge, H. Takeda, Zs Vajta, H. K. Wang, J. Wu, A. Wendt, C. G. Wang, H. Y. Wu, X. Wang, C. G. Wu, C. Xu, Z. Y. Xu, A. Yagi, Y. L. Ye, K. Yoshinaga

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Abstract

The β-delayed γ-ray spectroscopy of neutron-rich Ag123,125 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2- β-emitting isomers in Ag123,125 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2- levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag123,125. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around Ag123 can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ν1h11/2 orbitals.

Original language	English
Article number	212502
Journal	Physical Review Letters
Volume	122
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.122.212502
Publication status	Published - 28 May 2019

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Chen, Z. Q., Li, Z. H., Hua, H., Watanabe, H., Yuan, C. X., Zhang, S. Q., Lorusso, G., Nishimura, S., Baba, H., Browne, F., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Doornenbal, P., Fukuda, N., Gey, G., Gernhäuser, R., Inabe, N., Isobe, T., ... Yoshinaga, K. (2019). Proton Shell Evolution below Sn 132: First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125. Physical Review Letters, 122(21), Article 212502. https://doi.org/10.1103/PhysRevLett.122.212502

@article{2d4d6a68c23c4871abbb34623d9fcfea,

title = "Proton Shell Evolution below Sn 132: First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125",

abstract = "The β-delayed γ-ray spectroscopy of neutron-rich Ag123,125 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2- β-emitting isomers in Ag123,125 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2- levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag123,125. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around Ag123 can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ν1h11/2 orbitals.",

author = "Chen, {Z. Q.} and Li, {Z. H.} and H. Hua and H. Watanabe and Yuan, {C. X.} and Zhang, {S. Q.} and G. Lorusso and S. Nishimura and H. Baba and F. Browne and G. Benzoni and Chae, {K. Y.} and Crespi, {F. C.L.} and P. Doornenbal and N. Fukuda and G. Gey and R. Gernh{\"a}user and N. Inabe and T. Isobe and Jiang, {D. X.} and A. Jungclaus and Jung, {H. S.} and Y. Jin and D. Kameda and Kim, {G. D.} and Kim, {Y. K.} and I. Kojouharov and Kondev, {F. G.} and T. Kubo and N. Kurz and Kwon, {Y. K.} and Li, {X. Q.} and Lou, {J. L.} and Lane, {G. J.} and Li, {C. G.} and Luo, {D. W.} and A. Montaner-Piz{\'a} and K. Moschner and Niu, {C. Y.} and F. Naqvi and M. Niikura and H. Nishibata and A. Odahara and R. Orlandi and Z. Patel and Zs Podoly{\'a}k and T. Sumikama and S{\"o}derstr{\"o}m, {P. A.} and H. Sakurai and H. Schaffner and Simpson, {G. S.} and K. Steiger and H. Suzuki and J. Taprogge and H. Takeda and Zs Vajta and Wang, {H. K.} and J. Wu and A. Wendt and Wang, {C. G.} and Wu, {H. Y.} and X. Wang and Wu, {C. G.} and C. Xu and Xu, {Z. Y.} and A. Yagi and Ye, {Y. L.} and K. Yoshinaga",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = may,

day = "28",

doi = "10.1103/PhysRevLett.122.212502",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "21",

}

Chen, ZQ, Li, ZH, Hua, H, Watanabe, H, Yuan, CX, Zhang, SQ, Lorusso, G, Nishimura, S, Baba, H, Browne, F, Benzoni, G, Chae, KY, Crespi, FCL, Doornenbal, P, Fukuda, N, Gey, G, Gernhäuser, R, Inabe, N, Isobe, T, Jiang, DX, Jungclaus, A, Jung, HS, Jin, Y, Kameda, D, Kim, GD, Kim, YK, Kojouharov, I, Kondev, FG, Kubo, T, Kurz, N, Kwon, YK, Li, XQ, Lou, JL, Lane, GJ, Li, CG, Luo, DW, Montaner-Pizá, A, Moschner, K, Niu, CY, Naqvi, F, Niikura, M, Nishibata, H, Odahara, A, Orlandi, R, Patel, Z, Podolyák, Z, Sumikama, T, Söderström, PA, Sakurai, H, Schaffner, H, Simpson, GS, Steiger, K, Suzuki, H, Taprogge, J, Takeda, H, Vajta, Z, Wang, HK, Wu, J, Wendt, A, Wang, CG, Wu, HY, Wang, X, Wu, CG, Xu, C, Xu, ZY, Yagi, A, Ye, YL & Yoshinaga, K 2019, 'Proton Shell Evolution below Sn 132: First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125', Physical Review Letters, vol. 122, no. 21, 212502. https://doi.org/10.1103/PhysRevLett.122.212502

TY - JOUR

T1 - Proton Shell Evolution below Sn 132

T2 - First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125

AU - Chen, Z. Q.

AU - Li, Z. H.

AU - Hua, H.

AU - Watanabe, H.

AU - Yuan, C. X.

AU - Zhang, S. Q.

AU - Lorusso, G.

AU - Nishimura, S.

AU - Baba, H.

AU - Browne, F.

AU - Benzoni, G.

AU - Chae, K. Y.

AU - Crespi, F. C.L.

AU - Doornenbal, P.

AU - Fukuda, N.

AU - Gey, G.

AU - Gernhäuser, R.

AU - Inabe, N.

AU - Isobe, T.

AU - Jiang, D. X.

AU - Jungclaus, A.

AU - Jung, H. S.

AU - Jin, Y.

AU - Kameda, D.

AU - Kim, G. D.

AU - Kim, Y. K.

AU - Kojouharov, I.

AU - Kondev, F. G.

AU - Kubo, T.

AU - Kurz, N.

AU - Kwon, Y. K.

AU - Li, X. Q.

AU - Lou, J. L.

AU - Lane, G. J.

AU - Li, C. G.

AU - Luo, D. W.

AU - Montaner-Pizá, A.

AU - Moschner, K.

AU - Niu, C. Y.

AU - Naqvi, F.

AU - Niikura, M.

AU - Nishibata, H.

AU - Odahara, A.

AU - Orlandi, R.

AU - Patel, Z.

AU - Podolyák, Zs

AU - Sumikama, T.

AU - Söderström, P. A.

AU - Sakurai, H.

AU - Schaffner, H.

AU - Simpson, G. S.

AU - Steiger, K.

AU - Suzuki, H.

AU - Taprogge, J.

AU - Takeda, H.

AU - Vajta, Zs

AU - Wang, H. K.

AU - Wu, J.

AU - Wendt, A.

AU - Wang, C. G.

AU - Wu, H. Y.

AU - Wang, X.

AU - Wu, C. G.

AU - Xu, C.

AU - Xu, Z. Y.

AU - Yagi, A.

AU - Ye, Y. L.

AU - Yoshinaga, K.

PY - 2019/5/28

Y1 - 2019/5/28

N2 - The β-delayed γ-ray spectroscopy of neutron-rich Ag123,125 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2- β-emitting isomers in Ag123,125 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2- levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag123,125. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around Ag123 can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ν1h11/2 orbitals.

AB - The β-delayed γ-ray spectroscopy of neutron-rich Ag123,125 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2- β-emitting isomers in Ag123,125 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2- levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag123,125. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around Ag123 can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ν1h11/2 orbitals.

UR - http://www.scopus.com/inward/record.url?scp=85066436956&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.122.212502

DO - 10.1103/PhysRevLett.122.212502

M3 - Article

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 21

M1 - 212502

ER -

Proton Shell Evolution below Sn 132: First Measurement of Low-Lying β -Emitting Isomers in Ag 123,125

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