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.
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Authors
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S.A. Sheets
Lawrence Livermore National Laboratory
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J.T. Burke
Lawrence Livermore National Laboratory
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D. Blueul
Lawrence Livermore National Laboratory
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T.A. Brown
Lawrence Livermore National Laboratory
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P.G. Grant
Lawrence Livermore National Laboratory
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R.D. Hoffman
Lawrence Livermore National Laboratory
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A.M. Hurst
Lawrence Livermore National Laboratory
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J.L. Fisker
Lawrence Livermore National Laboratory
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E.B. Norman
University of California, Berkeley
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L.W. Phair
Lawrence Berkeley National Laboratory
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N.D. Scielzo
Lawrence Livermore National Laboratory, LLNL
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S. Tumey
Lawrence Livermore National Laboratory