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K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Söderström, P-A, Walker, Philip, Wu, J, Liu, HL, Regan, Patrick, Watanabe, H, Doornenbal, P, Korkulu, Z, Lee, P, Liu, JJ , Lorusso, G, Nishimura, S, Phong, VH, Sumikama, T, Xu, FR, Lalkovski, S, Lotay, Gavin, Patel, Z, Podolyak, Zsolt and Shand, Callum (2016) K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy Physics Letters B, 762. pp. 404-408.

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Abstract

A detailed study of the structure of the doubly mid-shell nucleus View the MathML source has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2γ -vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ -vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of View the MathML source s with a possible spin-parity of 2−.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Söderström, P-AUNSPECIFIEDUNSPECIFIED
Walker, PhilipP.Walker@surrey.ac.ukUNSPECIFIED
Wu, JUNSPECIFIEDUNSPECIFIED
Liu, HLUNSPECIFIEDUNSPECIFIED
Regan, PatrickP.Regan@surrey.ac.ukUNSPECIFIED
Watanabe, HUNSPECIFIEDUNSPECIFIED
Doornenbal, PUNSPECIFIEDUNSPECIFIED
Korkulu, ZUNSPECIFIEDUNSPECIFIED
Lee, PUNSPECIFIEDUNSPECIFIED
Liu, JJUNSPECIFIEDUNSPECIFIED
Lorusso, GUNSPECIFIEDUNSPECIFIED
Nishimura, SUNSPECIFIEDUNSPECIFIED
Phong, VHUNSPECIFIEDUNSPECIFIED
Sumikama, TUNSPECIFIEDUNSPECIFIED
Xu, FRUNSPECIFIEDUNSPECIFIED
Lalkovski, SUNSPECIFIEDUNSPECIFIED
Lotay, Gaving.lotay@surrey.ac.ukUNSPECIFIED
Patel, ZUNSPECIFIEDUNSPECIFIED
Podolyak, ZsoltZ.Podolyak@surrey.ac.ukUNSPECIFIED
Shand, Callumc.shand@surrey.ac.ukUNSPECIFIED
Date : 4 October 2016
Identification Number : 10.1016/j.physletb.2016.09.058
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 : K isomer; Dysprosium; Mid-shell; γ-Ray spectroscopy
Depositing User : Symplectic Elements
Date Deposited : 24 Feb 2017 15:11
Last Modified : 31 Oct 2017 19:09
URI: http://epubs.surrey.ac.uk/id/eprint/813635

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