Thick target measurement of the 40Ca(a,g)44Ti reaction rate

ORAL

Abstract

The thick-target yield for the $^{40}$Ca($\alpha$,$\gamma$)$^{44}$Ti reaction has been measured for $E_{\rm beam}$ = 4.13, 4.54, and 5.36 MeV using $\gamma$-ray spectroscopy. At the highest beam energy, an activation measurement was performed. The results of the two measurements agree. From the measured yield a reaction rate is deduced that is smaller than current statistical-model calculations. This implies a smaller $^{44}$Ti production in supernova compared to recently measured $^{40}$Ca($\alpha$,$\gamma$)$^{44}$Ti reaction rates.

–

Authors

  • S.A. Sheets

    • Lawrence Livermore National Laboratory

  • J.T. Burke

    • Lawrence Livermore National Laboratory

  • D. Blueul

    • Lawrence Livermore National Laboratory

  • T.A. Brown

    • Lawrence Livermore National Laboratory

  • P.G. Grant

    • Lawrence Livermore National Laboratory

  • R.D. Hoffman

    • Lawrence Livermore National Laboratory

  • A.M. Hurst

    • Lawrence Livermore National Laboratory

  • J.L. Fisker

    • Lawrence Livermore National Laboratory

  • E.B. Norman

    • University of California, Berkeley

  • L.W. Phair

    • Lawrence Berkeley National Laboratory

  • N.D. Scielzo

    • Lawrence Livermore National Laboratory
    • LLNL

  • S. Tumey

    • Lawrence Livermore National Laboratory