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Core of F25 studied by the F25(−p) proton-removal reaction

H. L. Crawford1,*, M. D. Jones1,2, A. O. Macchiavelli1,3, P. Fallon1, D. Bazin4, P. C. Bender4,†, B. A. Brown4,5, C. M. Campbell1, R. M. Clark1 et al.

M. Cromaz1, B. Elman4,5, A. Gade4,5, J. D. Holt6, R. V. F. Janssens2, I. Y. Lee1, B. Longfellow4,5,‡, S. Paschalis7, M. Petri7, A. L. Richard4,‡, M. Salathe1, J. A. Tostevin8, and D. Weisshaar4

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27559-3255, USA and Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708-0308, USA
  • 3Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 5Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 6TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 7Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 8Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

  • *Corresponding author: hlcrawford@lbl.gov
  • †Present address: Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA.
  • ‡Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
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Phys. Rev. C 106, L061303 – Published 5 December, 2022

DOI: https://doi.org/10.1103/PhysRevC.106.L061303

Abstract

The Be9(BeF25(5/2+),BeO24)X proton-removal reaction was studied at the NSCL using the S800 spectrometer. The experimental spectroscopic factor for the ground-state to ground-state transition indicates a substantial depletion of the proton d5/2 strength compared to shell-model expectations, similar to the findings of an inverse-kinematics (p,2p) measurement performed at RIBF. The BeF25 to BeO24 ground-states overlap is considerably less than anticipated if the core nucleons behaved as rigid, doubly-magic BeO24 within BeF25. We interpret the new results within the framework of the Particle-Vibration Coupling (PVC) model, of a d5/2 proton coupled to a quadrupole phonon of an effective core. This approach provides a good description of the experimental data, requiring an effective BeO*24 core with a phonon energy of ℏω2= 3.2 MeV and a B(E2)≈2.7 W.u. – softer and more collective than a bare BeO24. Both the Nilsson deformed mean field and the PVC models appear to capture the properties of the effective core of BeF25, suggesting that the additional proton polarizes BeO24 in such a way that it becomes either slightly deformed or a quadrupole vibrator.

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Phys. Rev. C 106, L061303– Published 5 December, 2022
  • Received 7 September 2022
  • Accepted 16 November 2022
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