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

Watanabe, H, Zhang, G, Yoshida, K, Walker, PM, Liu, J, Wu, J, Regan, PH, Soderstrom, PA, Kanaoka, H, Korkulu, Z, Lee, PS, Nishimura, S, Yagi, A, Ahn, DS, Alharbi, T, Baba, H, Browne, F, Bruce, AM, Fukuda, RJ, 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, Podolyak, Z, Roberts, OJ, Sakurai, H, Schaffner, H, Shand, CM, Shimizu, Y, Sumikama, T, Suzuki, H, Takeda, H, Terashima, S, Vajta;, Z, Valiente-Dobon, JJ and Xu, ZY (2016) Long-lived K isomer and enhanced gamma vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell Physics Letters B, 760 (Sept). pp. 641-646.

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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 T1/2 = 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.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Watanabe, HUNSPECIFIEDUNSPECIFIED
Zhang, GUNSPECIFIEDUNSPECIFIED
Yoshida, KUNSPECIFIEDUNSPECIFIED
Walker, PMUNSPECIFIEDUNSPECIFIED
Liu, JUNSPECIFIEDUNSPECIFIED
Wu, JUNSPECIFIEDUNSPECIFIED
Regan, PHUNSPECIFIEDUNSPECIFIED
Soderstrom, PAUNSPECIFIEDUNSPECIFIED
Kanaoka, HUNSPECIFIEDUNSPECIFIED
Korkulu, ZUNSPECIFIEDUNSPECIFIED
Lee, PSUNSPECIFIEDUNSPECIFIED
Nishimura, SUNSPECIFIEDUNSPECIFIED
Yagi, AUNSPECIFIEDUNSPECIFIED
Ahn, DSUNSPECIFIEDUNSPECIFIED
Alharbi, TUNSPECIFIEDUNSPECIFIED
Baba, HUNSPECIFIEDUNSPECIFIED
Browne, FUNSPECIFIEDUNSPECIFIED
Bruce, AMUNSPECIFIEDUNSPECIFIED
Fukuda, RJUNSPECIFIEDUNSPECIFIED
Griffin, CUNSPECIFIEDUNSPECIFIED
Ideguchi, EUNSPECIFIEDUNSPECIFIED
Inabe, NUNSPECIFIEDUNSPECIFIED
Isobe, TUNSPECIFIEDUNSPECIFIED
Kanaya, SUNSPECIFIEDUNSPECIFIED
Kojouharov, IUNSPECIFIEDUNSPECIFIED
Kondev, FGUNSPECIFIEDUNSPECIFIED
Kubo, TUNSPECIFIEDUNSPECIFIED
Kubono, SUNSPECIFIEDUNSPECIFIED
Kurz, NUNSPECIFIEDUNSPECIFIED
Kuti, IUNSPECIFIEDUNSPECIFIED
Lalkovski, SUNSPECIFIEDUNSPECIFIED
Lane;, GJUNSPECIFIEDUNSPECIFIED
Lee, CSUNSPECIFIEDUNSPECIFIED
Lee, EJUNSPECIFIEDUNSPECIFIED
Lorusso, GUNSPECIFIEDUNSPECIFIED
Lotay, GUNSPECIFIEDUNSPECIFIED
Moon, CBUNSPECIFIEDUNSPECIFIED
Nishizuka, IUNSPECIFIEDUNSPECIFIED
Nita, CRUNSPECIFIEDUNSPECIFIED
Odahara, AUNSPECIFIEDUNSPECIFIED
Patel, ZUNSPECIFIEDUNSPECIFIED
Phong, VHUNSPECIFIEDUNSPECIFIED
Podolyak, ZUNSPECIFIEDUNSPECIFIED
Roberts, OJUNSPECIFIEDUNSPECIFIED
Sakurai, HUNSPECIFIEDUNSPECIFIED
Schaffner, HUNSPECIFIEDUNSPECIFIED
Shand, CMUNSPECIFIEDUNSPECIFIED
Shimizu, YUNSPECIFIEDUNSPECIFIED
Sumikama, TUNSPECIFIEDUNSPECIFIED
Suzuki, HUNSPECIFIEDUNSPECIFIED
Takeda, HUNSPECIFIEDUNSPECIFIED
Terashima, SUNSPECIFIEDUNSPECIFIED
Vajta;, ZUNSPECIFIEDUNSPECIFIED
Valiente-Dobon, JJUNSPECIFIEDUNSPECIFIED
Xu, ZYUNSPECIFIEDUNSPECIFIED
Date : 25 July 2016
Identification Number : 10.1016/j.physletb.2016.07.057
Copyright Disclaimer : © 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Uncontrolled Keywords : Dy, K isomer, Decay spectroscopy, Axial symmetry, γ vibration
Depositing User : Symplectic Elements
Date Deposited : 22 Jul 2016 17:20
Last Modified : 25 Nov 2016 16:05
URI: http://epubs.surrey.ac.uk/id/eprint/811340

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