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Core excitations across the neutron shell gap in 207Tl

Authors :
E. Wilson
Zs. Podolyák
H. Grawe
B.A. Brown
C.J. Chiara
S. Zhu
B. Fornal
R.V.F. Janssens
C.M. Shand
M. Bowry
M. Bunce
M.P. Carpenter
N. Cieplicka-Oryńczak
A.Y. Deo
G.D. Dracoulis
C.R. Hoffman
R.S. Kempley
F.G. Kondev
G.J. Lane
T. Lauritsen
G. Lotay
M.W. Reed
P.H. Regan
C. Rodríguez Triguero
D. Seweryniak
B. Szpak
P.M. Walker
Source :
Physics Letters B, Vol 747, Iss C, Pp 88-92 (2015)
Publication Year :
2015
Publisher :
Elsevier, 2015.

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.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
03702693 and 18732445
Volume :
747
Issue :
C
Database :
Directory of Open Access Journals
Journal :
Physics Letters B
Publication Type :
Academic Journal
Accession number :
edsdoj.37557363a3c745e783df75ffa158711a
Document Type :
article
Full Text :
https://doi.org/10.1016/j.physletb.2015.04.055