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arXiv · 1608.03290

Study of $\boldsymbol{(\alpha,p)}$ and $\boldsymbol{(\alpha,n)}$ reactions with a Multi-Sampling Ionization Chamber

M. L. Avila·K. E. Rehm·S. Almaraz-Calderon·A. D. Ayangeakaa·C. Dickerson·C. R. Hoffman·C. L. Jiang·B. P. Kay·J. Lai·O. Nusair·R. C. Pardo·D. Santiago-Gonzalez·R. Talwar·C. Ugalde
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Abstract

A large number of $(\alpha,p)$ and $(\alpha,n)$ reactions are known to play a fundamental role in nuclear astrophysics. This work presents a novel technique to study these reactions with the active target system MUSIC whose segmented anode allows the investigation of a large energy range of the excitation function with a single beam energy. In order to verify the method, we performed a direct measurements of the previously measured reactions $^{17}$O$(\alpha,n)^{20}$Ne, $^{23}$Na$(\alpha,p)^{26}$Mg, and $^{23}$Na$(\alpha,n)^{26}$Al. These reactions were investigated in inverse kinematics using $^{4}$He gas in the detector to study the excitation function in the range of about 2 to 6 MeV in the center of mass. We found good agreement between the cross sections of the $^{17}$O$(\alpha,n)^{20}$Ne reaction measured in this work and previous measurements. Furthermore we have successfully performed a simultaneous measurement of the $^{23}$Na$(\alpha,p)^{26}$Mg and $^{23}$Na$(\alpha,n)^{26}$Al reactions.

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M. L. Avila, K. E. Rehm, S. Almaraz-Calderon, A. D. Ayangeakaa, C. Dickerson, C. R. Hoffman, C. L. Jiang, B. P. Kay, J. Lai, O. Nusair, R. C. Pardo, D. Santiago-Gonzalez, R. Talwar, C. Ugalde. 2016-08-10. Study of $\boldsymbol{(\alpha,p)}$ and $\boldsymbol{(\alpha,n)}$ reactions with a Multi-Sampling Ionization Chamber. https://doi.org/10.1016/j.nima.2017.03.060

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