A Gateway to Astrophysically Important (n,p) Reactions

ORAL

Abstract

To understand the role of np-process in production of p-nuclei in the neutrino driven winds of core-collapse supernova, the cross sections of key (n,p) nuclear reactions are particularly important [1]. A small variation in cross sections of these reactions brings about a significant difference in the abundance distribution of p-nuclei [1]. However, there are several uncertainties in the cross sections of these reactions, and the sensitivity studies rely on theoretically calculated cross sections. The direct experimental measurement of (n,p) cross sections on short-lived exotic nuclei is extremely challenging. Because of this, an indirect reaction measurement technique, called the Surrogate Reaction Method (SRM) [2], is being expanded to extract cross sections of (n,p) reactions. Using stable 96Mo target, the 96Mo(p,p`g) measurement was performed with a 20.97 MeV proton beam using the GODDESS (GRETINA-ORRUBA: Dual Detectors for Experimental Structure Studies) detection system at ATLAS to utilize the (p,p`) reaction as a surrogate for the (n,p) reaction. The experimental details and preliminary results will be presented.

[1] S. Wanajo, H-T. Janka, and S. Kubono, The Astrophysical Journal 729, 46 (2011)

[2] J.E. Escher et al., Rev. Mod. Phys. 84, 353 (2012)

*This work was supported in part by the U.S. DOE, NNSA, Office of Nuclear Physics, NSF and used the resources of ATLAS facility at ANL.

–

Presenters

  • Rajesh Ghimire

    • Lawrence Livermore National Laboratory

Authors

  • Rajesh Ghimire

    • Lawrence Livermore National Laboratory

  • Andrew Ratkiewicz

    • Lawrence Livermore National Laboratory, Livermore, CA, USA
    • Lawrence Livermore National Laboratory

  • 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

  • Jutta E Escher

    • Lawrence Livermore Natl Lab

  • Jolie Antonia Cizewski

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

  • Scott R Carmichael

    • University of Notre Dame

  • Heather Irene Garland

    • Rutgers University, New Brunswick
    • Pacific Northwest National Laboratory (PNNL)
    • Pacific Northwest National Laboratory

  • Eunjin In

    • Lawrence Livermore National Laboratory

  • Harrison E Sims

    • Rutgers University, New Brunswick

  • Chad Ummel

    • Rutgers University

  • Nicholas David Scielzo

    • Lawrence Livermore National Laboratory