Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

H. Watanabe; G. X. Zhang; K. Yoshida; P. M. Walker; J. J. Liu; J. Wu; P. H. Regan; P. A. Söderström; H. Kanaoka; Z. Korkulu; P. S. Lee; S. Nishimura; A. Yagi; D. S. Ahn; T. Alharbi; H. Baba; F. Browne; A. M. Bruce; R. J. Carroll; K. Y. Chae; Zs Dombradi; P. Doornenbal; A. Estrade; N. Fukuda; C. Griffin; E. Ideguchi; N. Inabe; T. Isobe; S. Kanaya; I. Kojouharov; F. G. Kondev; T. Kubo; S. Kubono; N. Kurz; I. Kuti; S. Lalkovski; G. J. Lane; C. S. Lee; E. J. Lee; G. Lorusso; G. Lotay; C. B. Moon; I. Nishizuka; C. R. Nita; A. Odahara; Z. Patel; V. H. Phong; Zs Podolyák; O. J. Roberts; H. Sakurai; H. Schaffner; C. M. Shand; Y. Shimizu; T. Sumikama; H. Suzuki; H. Takeda; S. Terashima; Zs Vajta; J. J. Valiente-Dóbon; Z. Y. Xu

doi:10.1016/j.physletb.2016.07.057

Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus ¹⁷²Dy: Collectivity beyond double midshell

H. Watanabe^*, G. X. Zhang, K. Yoshida, P. M. Walker, J. J. Liu, J. Wu, P. H. Regan, P. A. Söderström, H. Kanaoka, Z. Korkulu, P. S. Lee, S. Nishimura, A. Yagi, D. S. Ahn, T. Alharbi, H. Baba, F. Browne, A. M. Bruce, R. J. Carroll, K. Y. ChaeZs Dombradi, P. Doornenbal, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi, N. Inabe, T. Isobe, S. Kanaya, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, C. S. Lee, E. J. Lee, G. Lorusso, G. Lotay, C. B. Moon, I. Nishizuka, C. R. Nita, A. Odahara, Z. Patel, V. H. Phong, Zs Podolyák, O. J. Roberts, H. Sakurai, H. Schaffner, C. M. Shand, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, S. Terashima, Zs Vajta, J. J. Valiente-Dóbon, Z. Y. Xu

^*Corresponding author for this work

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Abstract

The level structure of ¹⁷²Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a ²³⁸U beam. A long-lived isomeric state with T_1/2=0.71(5) s and K^π=8⁻ has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus ¹⁷²Ho via allowed β decays. The robust nature of the K^π=8⁻ isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

Original language	English
Pages (from-to)	641-646
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	760
DOIs	https://doi.org/10.1016/j.physletb.2016.07.057
Publication status	Published - 10 Sept 2016

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Watanabe, H., Zhang, G. X., Yoshida, K., Walker, P. M., Liu, J. J., Wu, J., Regan, P. H., Söderström, P. A., Kanaoka, H., Korkulu, Z., Lee, P. S., Nishimura, S., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carroll, R. J., ... Xu, Z. Y. (2016). Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus ¹⁷²Dy: Collectivity beyond double midshell. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 760, 641-646. https://doi.org/10.1016/j.physletb.2016.07.057

@article{b2d076eaa0ab47a98daf72d0e695677f,

title = "Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell",

abstract = "The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8− has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ=8− isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.",

keywords = "Axial symmetry, Decay spectroscopy, Dy, K isomer, γ vibration",

author = "H. Watanabe and Zhang, {G. X.} and K. Yoshida and Walker, {P. M.} and Liu, {J. J.} and J. Wu and Regan, {P. H.} and S{\"o}derstr{\"o}m, {P. A.} and H. Kanaoka and Z. Korkulu and Lee, {P. S.} and S. Nishimura and A. Yagi and Ahn, {D. S.} and T. Alharbi and H. Baba and F. Browne and Bruce, {A. M.} and Carroll, {R. J.} and Chae, {K. Y.} and Zs Dombradi and P. Doornenbal and A. Estrade and N. Fukuda and C. Griffin and E. Ideguchi and N. Inabe and T. Isobe and S. Kanaya and I. Kojouharov and Kondev, {F. G.} and T. Kubo and S. Kubono and N. Kurz and I. Kuti and S. Lalkovski and Lane, {G. J.} and Lee, {C. S.} and Lee, {E. J.} and G. Lorusso and G. Lotay and Moon, {C. B.} and I. Nishizuka and Nita, {C. R.} and A. Odahara and Z. Patel and Phong, {V. H.} and Zs Podoly{\'a}k and Roberts, {O. J.} and H. Sakurai and H. Schaffner and Shand, {C. M.} and Y. Shimizu and T. Sumikama and H. Suzuki and H. Takeda and S. Terashima and Zs Vajta and Valiente-D{\'o}bon, {J. J.} and Xu, {Z. Y.}",

note = "Publisher Copyright: {\textcopyright} 2016 The Author(s)",

year = "2016",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2016.07.057",

language = "English",

volume = "760",

pages = "641--646",

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

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Watanabe, H, Zhang, GX, Yoshida, K, Walker, PM, Liu, JJ, Wu, J, Regan, PH, Söderström, PA, Kanaoka, H, Korkulu, Z, Lee, PS, Nishimura, S, Yagi, A, Ahn, DS, Alharbi, T, Baba, H, Browne, F, Bruce, AM, Carroll, RJ, Chae, KY, Dombradi, Z, Doornenbal, P, Estrade, A, Fukuda, N, Griffin, C, Ideguchi, E, Inabe, N, Isobe, T, Kanaya, S, Kojouharov, I, Kondev, FG, Kubo, T, Kubono, S, Kurz, N, Kuti, I, Lalkovski, S, Lane, GJ, Lee, CS, Lee, EJ, Lorusso, G, Lotay, G, Moon, CB, Nishizuka, I, Nita, CR, Odahara, A, Patel, Z, Phong, VH, Podolyák, Z, Roberts, OJ, Sakurai, H, Schaffner, H, Shand, CM, Shimizu, Y, Sumikama, T, Suzuki, H, Takeda, H, Terashima, S, Vajta, Z, Valiente-Dóbon, JJ & Xu, ZY 2016, 'Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus ¹⁷²Dy: Collectivity beyond double midshell', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 760, pp. 641-646. https://doi.org/10.1016/j.physletb.2016.07.057

TY - JOUR

T1 - Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy

T2 - Collectivity beyond double midshell

AU - Watanabe, H.

AU - Zhang, G. X.

AU - Yoshida, K.

AU - Walker, P. M.

AU - Liu, J. J.

AU - Wu, J.

AU - Regan, P. H.

AU - Söderström, P. A.

AU - Kanaoka, H.

AU - Korkulu, Z.

AU - Lee, P. S.

AU - Nishimura, S.

AU - Yagi, A.

AU - Ahn, D. S.

AU - Alharbi, T.

AU - Baba, H.

AU - Browne, F.

AU - Bruce, A. M.

AU - Carroll, R. J.

AU - Chae, K. Y.

AU - Dombradi, Zs

AU - Doornenbal, P.

AU - Estrade, A.

AU - Fukuda, N.

AU - Griffin, C.

AU - Ideguchi, E.

AU - Inabe, N.

AU - Isobe, T.

AU - Kanaya, S.

AU - Kojouharov, I.

AU - Kondev, F. G.

AU - Kubo, T.

AU - Kubono, S.

AU - Kurz, N.

AU - Kuti, I.

AU - Lalkovski, S.

AU - Lane, G. J.

AU - Lee, C. S.

AU - Lee, E. J.

AU - Lorusso, G.

AU - Lotay, G.

AU - Moon, C. B.

AU - Nishizuka, I.

AU - Nita, C. R.

AU - Odahara, A.

AU - Patel, Z.

AU - Phong, V. H.

AU - Podolyák, Zs

AU - Roberts, O. J.

AU - Sakurai, H.

AU - Schaffner, H.

AU - Shand, C. M.

AU - Shimizu, Y.

AU - Sumikama, T.

AU - Suzuki, H.

AU - Takeda, H.

AU - Terashima, S.

AU - Vajta, Zs

AU - Valiente-Dóbon, J. J.

AU - Xu, Z. Y.

PY - 2016/9/10

Y1 - 2016/9/10

N2 - The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8− has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ=8− isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

AB - The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8− has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ=8− isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

KW - Axial symmetry

KW - Decay spectroscopy

KW - Dy

KW - K isomer

KW - γ vibration

UR - http://www.scopus.com/inward/record.url?scp=84994524502&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.07.057

DO - 10.1016/j.physletb.2016.07.057

M3 - Article

SN - 0370-2693

VL - 760

SP - 641

EP - 646

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

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

ER -

Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus ¹⁷²Dy: Collectivity beyond double midshell

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