Improved measurements of (α,p) reactions with a new ANASEN design

ORAL

Abstract

Several (α,p) reactions on proton-rich nuclei are among the most important nuclear reactions occurring during Type I X-ray bursts. However, large uncertainties remain in these reaction rates due to the lack of direct measurements. The Array for Nuclear Astrophysics and Structure with Exotic Nuclei (ANASEN) is a gas target and charged particle detector designed for studying (α,p) reactions. We have developed a new approach, replacing the proportional counter with a hexagonal barrel of thin (~80 μm) silicon detectors to improve the tracking resolution, though at a cost of overall efficiency. The new setup was used in stable beam tests at the Fox Laboratory at Florida State University, and in both stable and radioactive beam measurements at TRIUMF-ISAC. Results from a measurement of the 18F(α,p)21Ne excitation function at TRIUMF-ISAC, which may impact asymptotic giant branch nucleosynthesis and helium burning on accreting white dwarfs, will be presented. Plans for future measurements at TRIUMF-ISAC and FRIB will be discussed.

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Presenters

  • Keilah Davis

    Louisiana State University

Authors

  • Keilah Davis

    Louisiana State University

  • Jeff C Blackmon

    Louisiana State University

  • Catherine M Deibel

    Louisiana State University

  • Gemma L Wilson

    Louisiana State University

  • Sudarsan Balakrishnan

    Rutgers University, Department of Physics and Astronomy, Rutgers University, New Brunswick, NJ, USA

  • Vignesh Sitaraman

    Florida State University

  • Gordon W McCann

    Michigan State University

  • Ingo L Wiedenhoever

    Florida State University

  • Lagy T Baby

    Florida State University

  • Ivan A Tolstukhin

    Argonne National Laboratory

  • Annika Lennarz

    TRIUMF

  • Martin Alcorta

    TRIUMF

  • Soham Chakraborty

    University of York

  • Allison Laird

    University of York

  • Jan Glorius

    GSI Helmholtz Centre for Heavy Ion Research

  • Dan W Bardayan

    University of Notre Dame

  • Scott R Carmichael

    University of Notre Dame

  • Steven D Pain

    Oak Ridge National Laboratory, Oak Ridge, TN, USA / Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA, Oak Ridge National Laboratory, University of Tennessee, Oak Ridge National Laboratory / University of Tennessee-Knoxville

  • Reuben Russell

    University of Surrey

  • Louis Wagner

    TRIUMF

  • Chris Esparza

    Florida State University