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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, Philip, Liu, J, Wu, J, Regan, Patrick, 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, Gavin, Moon, CB, Nishizuka, I, Nita, CR, Odahara, A, Patel, Z, Phong, VH, Podolyak, Zsolt, Roberts, OJ, Sakurai, H, Schaffner, H, Shand, Callum, 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 :
NameEmailORCID
Watanabe, H
Zhang, G
Yoshida, K
Walker, PhilipP.Walker@surrey.ac.uk
Liu, J
Wu, J
Regan, PatrickP.Regan@surrey.ac.uk
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, Gaving.lotay@surrey.ac.uk
Moon, CB
Nishizuka, I
Nita, CR
Odahara, A
Patel, Z
Phong, VH
Podolyak, ZsoltZ.Podolyak@surrey.ac.uk
Roberts, OJ
Sakurai, H
Schaffner, H
Shand, Callumc.shand@surrey.ac.uk
Shimizu, Y
Sumikama, T
Suzuki, H
Takeda, H
Terashima, S
Vajta;, Z
Valiente-Dobon, JJ
Xu, ZY
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 : 13 Jul 2017 11:06
URI: http://epubs.surrey.ac.uk/id/eprint/811340

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