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Inverse kinematics study of the energy levels of Ne21 populated with the Ne20+d reaction

C. Angus1,2, A. M. Laird1, T. L. Tang3,4, P. Adsley5,6, M. L. Avila3, S. Chakraborty1,*, J. Frost-Schenk1,†, C. R. Hoffman3, H. Jayatissa3,‡ et al.

B. P. Kay3, R. Longland7,8, C. Müller-Gatermann3, J. S. Rojo1,*, I. A. Tolstukhin3, and G. L. Wilson9,3,§

  • *Present Address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • †Present Address: Department of Physics and Astronomy, University College London, London WC1E 6BT, England, United Kingdom.
  • ‡Present Address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • §Present Address: United Kingdom Atomic Energy Authority, Culham Campus, Abingdon OX14 3DB, England, United Kingdom.
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Phys. Rev. C 112, 025803 – Published 8 August, 2025

DOI: https://doi.org/10.1103/byw8-bvrn

Abstract

Background: In recent years there has been significant experimental effort aimed at studying the impact of O16 neutron poisoning on the weak s process in rotating massive stars. Improving the understanding of energy levels in Ne21 is crucial to reducing uncertainties in the rates of the α-induced reactions on O17 that determine the overall efficiency of the weak s process.

Purpose: This paper reports on one such experiment: a study of the Ne20(d,p)Ne21 reaction in inverse kinematics.

Methods: Deduced spin-parity assignments were made based on adiabatic distorted-wave approximation analysis and neutron partial widths were estimated by comparison with a previous experiment.

Results: Of particular significance for nuclear astrophysics is the resulting neutron partial width for the 7820-keV energy level, estimated to be 12200(2900)eV, and an upper limit of ≤9300eV for that of the 7749-keV energy level.

Conclusions: These results are in tension with previous studies and therefore this paper also discusses the current state of the research into the astrophysically relevant energy levels and highlights both areas of agreement and areas of disagreement between this and various other studies that have investigated this nucleus.

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Phys. Rev. C 112, 025803– Published 8 August, 2025
  • Received 11 April 2025
  • Accepted 7 July 2025
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