First direct measurement of the ${}^{13}$N($\alpha$,$p$)${}^{16}$O reaction relevant for core-collapse supernovae nucleosynthesis

Abstract

Understanding the explosion mechanism of a core-collapse supernova (CCSN) is important to accurately model CCSN scenarios for different progenitor stars using model-observation comparisons. The uncertainties of various nuclear reaction rates relevant for CCSN scenarios strongly affect the accuracy of these stellar models. Out of these reactions, the ${}^{13}$N($\alpha$,$p$)${}^{16}$O reaction has been found to affect various stages of a CCSN at varying temperatures. This work presents the first direct measurement of the ${}^{13}$N($\alpha$,$p$)${}^{16}$O reaction performed using a 34.6 MeV beam of radioactive ${}^{13}$N ions and the active-target detector MUSIC (MUlti-Sampling Ionization Chamber) at Argonne National Laboratory. The resulting total ${}^{13}$N($\alpha$,$p$)${}^{16}$O reaction cross sections from this measurement in the center-of-mass energy range of 3.26 - 6.02 MeV are presented and compared with calculations using the Hauser-Feshbach formalism. Uncertainties in the reaction rate have been dramatically reduced at CCSN temperatures.

arXiv commentReferences 27 and 31 has been changed

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