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 et al, 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 :	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
Date :	30 July 2015
DOI :	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 :	Author
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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