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40K plays a significant role in the radiogenic heating of earth-likeexoplanets, which can affect the development of a habitable environment ontheir surfaces. The initial amount of 40K in the interior of these planetsdepends on the composition of the interstellar clouds from which they formed.Within this context, nuclear reactions that regulate the production of 40Kduring stellar evolution can play a critical role. In this study, we constrainfor the first time the astrophysical reaction rate of 40K(n,p)40Ar, which isresponsible for the destruction of 40K during stellar nucleosynthesis. Weperformed differential cross-section measurements on the 40Ar(p,n)40K reaction,for six energies in the center-of-mass between 3.2 and 4.0 MeV and variousangles between 0-deg and 135-deg. The experiment took place at the EdwardsAccelerator Laboratory at Ohio University using the beam swinger targetlocation and a standard neutron time-of-flight technique. The total and partialcross-sections varied with energy due to the contribution from isobaric analogstates and Ericson type fluctuations. The energy-averaged neutron angulardistributions were symmetrical relative to 90-deg and consistent with thetheoretical predictions of the statistical model. Based on the experimentaldata, local transmission coefficients were extracted and were used to calculatethe astrophysical reaction rates of 40Ar(p,n)40K and 40K(n,p)40Ar reactions.Our results support that the destruction rate of 40K in massive stars via the40K(n,p)40Ar reaction is larger compared to previous estimates. This resultdirectly affects the predicted stellar yields of 40K from nucleosynthesis,which is a critical input parameter for the galactic chemical evolution modelsthat are currently employed for the study of significant properties ofexoplanets.

Constraining the destruction rate of $^{40}$K in stellar nucleosynthesis through the study of the $^{40}$Ar(p,n)$^{40}$K reaction