Measurement of key resonances for the Al24(p,γ)Si25 reaction rate using in-beam γ-ray spectroscopy

B. Longfellow, A. Gade, B. A. Brown, W. A. Richter, D. Bazin, P. C. Bender, M. Bowry, B. Elman, E. Lunderberg, D. Weisshaar, and S. J. Williams
Phys. Rev. C 97, 054307 – Published 4 May 2018

Abstract

Energy levels and branching ratios for the rp-process nucleus Si25 were determined from the reactions Be9(Si26,Si25)X and Be9(Al25,Si25)X using in-beam γ-ray spectroscopy with both high-efficiency and high-resolution detector arrays. Proton-unbound states at 3695(14) and 3802(11) keV were identified and assigned tentative spins and parities based on comparison to theory and the mirror nucleus. The Al24(p,γ)Si25 reaction rate was calculated using the experimental states and states from charge-dependent USDA and USDB shell-model calculations with downward shifts of the 1s1/2 proton orbital to account for the observed Thomas-Ehrman shift, leading to a factor of 10–100 increase in rate for the temperature region of 0.22 GK as compared to a previous calculation. These shifts may be applicable to neighboring nuclei, impacting the proton capture rates in this region of the chart.

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  • Received 10 January 2018
  • Revised 4 March 2018

DOI:https://doi.org/10.1103/PhysRevC.97.054307

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

B. Longfellow1,2, A. Gade1,2,3, B. A. Brown1,2, W. A. Richter4,5, D. Bazin1, P. C. Bender1,*, M. Bowry1,†, B. Elman1,2, E. Lunderberg1,2, D. Weisshaar1, and S. J. Williams1,‡

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3The JINA Center for the Evolution of the Elements, Michigan State University, East Lansing, Michigan 48824, USA
  • 4iThemba LABS, P.O. Box 722, Somerset West 7129, South Africa
  • 5Department of Physics, University of Stellenbosch, Matieland 7602, South Africa

  • *Present address: Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA.
  • Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • Present address: Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom.

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Issue

Vol. 97, Iss. 5 — May 2018

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