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Core excitations across the neutron shell gap in Tl-207

Wilson, E, Podolyak, Z, Grawe, H, Brown, BA, Chiara, CJ, Zhu, S, Fornal, B, Janssens, RVF, Shand, CM, Bowry, M , Bunce, M, Carpenter, MP, Cieplicka-Orynczak, N, Deo, AY, Dracoulis, GD, Hoffman, CR, Kempley, RS, Kondev, FG, Lane, GJ, Lauritsen, T, Lotay, G, Reed, MW, Regan, PH, Triguero, CR, Seweryniak, D, Szpak, B and Walker, PM (2015) Core excitations across the neutron shell gap in Tl-207 PHYSICS LETTERS B, 747. pp. 88-92.

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Abstract

The single closed-neutron-shell, one proton-hole nucleus 207Tl was populated in deep-inelastic collisions of a 208Pb beam with a 208Pb target. The yrast and near-yrast level scheme has been established up to high excitation energy, comprising an octupole phonon state and a large number of core excited states. Based on shell-model calculations, all observed single core excitations were established to arise from the breaking of the N=126 neutron core. While the shell-model calculations correctly predict the ordering of these states, their energies are compressed at high spins. It is concluded that this compression is an intrinsic feature of shell-model calculations using two-body matrix elements developed for the description of two-body states, and that multiple core excitations need to be considered in order to accurately calculate the energy spacings of the predominantly three-quasiparticle states.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Wilson, E
Podolyak, Z
Grawe, H
Brown, BA
Chiara, CJ
Zhu, S
Fornal, B
Janssens, RVF
Shand, CM
Bowry, M
Bunce, M
Carpenter, MP
Cieplicka-Orynczak, N
Deo, AY
Dracoulis, GD
Hoffman, CR
Kempley, RS
Kondev, FG
Lane, GJ
Lauritsen, T
Lotay, G
Reed, MW
Regan, PH
Triguero, CR
Seweryniak, D
Szpak, B
Walker, PM
Date : 30 July 2015
Identification Number : 10.1016/j.physletb.2015.04.055
Uncontrolled Keywords : Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics, PB-208, GAMMASPHERE, NUCLEI
Related URLs :
Additional Information : Published under a CC BY user license.
Depositing User : Symplectic Elements
Date Deposited : 15 Sep 2015 09:53
Last Modified : 31 Oct 2017 17:37
URI: http://epubs.surrey.ac.uk/id/eprint/808394

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