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.

*This material is based upon work supported by NSF Grant No. PHY-2012522, US DOE Grant No. DE-FG02-96ER40978, and the National Science Foundation Graduate Research Fellowship Program under Grant No. GR-00010333.

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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