Physics Letters B (Jul 2015)
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. Lauritsen,
- G. Lotay,
- M.W. Reed,
- P.H. Regan,
- C. Rodríguez Triguero,
- D. Seweryniak,
- B. Szpak,
- P.M. Walker
Affiliations
- E. Wilson
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- Zs. Podolyák
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- H. Grawe
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- B.A. Brown
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824-1321, USA
- C.J. Chiara
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
- S. Zhu
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- B. Fornal
- H. Niewodniczański Institute of Nuclear Physics, PL-31342 Kraków, Poland
- R.V.F. Janssens
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- C.M. Shand
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- M. Bowry
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- M. Bunce
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- M.P. Carpenter
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- N. Cieplicka-Oryńczak
- H. Niewodniczański Institute of Nuclear Physics, PL-31342 Kraków, Poland
- A.Y. Deo
- Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
- G.D. Dracoulis
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
- C.R. Hoffman
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- R.S. Kempley
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- F.G. Kondev
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
- G.J. Lane
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
- T. Lauritsen
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- G. Lotay
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- M.W. Reed
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- P.H. Regan
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- C. Rodríguez Triguero
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4GL, UK
- D. Seweryniak
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- B. Szpak
- H. Niewodniczański Institute of Nuclear Physics, PL-31342 Kraków, Poland
- P.M. Walker
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- DOI
- https://doi.org/10.1016/j.physletb.2015.04.055
- Journal volume & issue
-
Vol. 747,
no. C
pp. 88 – 92
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.
