Core excitations across the neutron shell gap in 207Tl

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. LauritsenG. Lotay, M. W. Reed, P. H. Regan, C. Rodríguez Triguero, D. Seweryniak, B. Szpak, P. M. Walker

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)88-92
    Number of pages5
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume747
    DOIs
    Publication statusPublished - 30 Jul 2015

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