Measurement of the Ne18(α,p)Na21 reaction with the ANASEN active-target detector system at Ec.m.=2.54 MeV

M. Anastasiou, I. Wiedenhöver, J. C. Blackmon, L. T. Baby, D. D. Caussyn, A. A. Hood, E. Koshchiy, J. C. Lighthall, K. T. Macon, J. J. Parker, T. Rauscher, and N. Rijal
Phys. Rev. C 105, 055806 – Published 19 May 2022

Abstract

The Ne18(α,p)Na21 reaction plays a significant role in Type-I X-ray bursts. It is a major path in the breakout from the hot-CNO cycles to the synthesis of heavier elements in the αp- and rp-processes. An experiment to determine the cross section of this reaction was performed with the ANASEN active-target detector system, determining the cross section at energies between 2.5 and 4 MeV in the center-of-mass frame. The measured cross sections for reactions populating the ground state in Na21 are consistent with results obtained from the time-inverse reaction, but significantly lower than the previously published experimental data of direct measurements. The total cross sections are also compared with those derived from indirect methods and statistical-model calculations. This experiment establishes a new experimental data set on the excitation function of the Ne18(α,p)Na21 reaction, revealing the significance of the excited states' contributions to the total reaction cross section and allowing us to separate the contribution of the (α,2p) reaction. The impact of the measured cross section on thermal reaction rates is discussed.

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  • Received 19 May 2021
  • Revised 16 January 2022
  • Accepted 18 March 2022

DOI:https://doi.org/10.1103/PhysRevC.105.055806

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. Anastasiou1,2,*, I. Wiedenhöver1,†, J. C. Blackmon3, L. T. Baby1, D. D. Caussyn1, A. A. Hood4,3, E. Koshchiy4, J. C. Lighthall3, K. T. Macon3, J. J. Parker1, T. Rauscher5,6, and N. Rijal1,7

  • 1Physics Department, Florida State University, Tallahassee, Florida 32306, USA
  • 2Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 3Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 4Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
  • 5Department of Physics, University of Basel, 4056 Basel, Switzerland
  • 6Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB, United Kingdom
  • 7Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA

  • *anastasiou2@llnl.gov
  • iwiedenhoever@fsu.edu

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Vol. 105, Iss. 5 — May 2022

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