Comment on "Observation of annual modulation by $\gamma$ rays from ($\alpha$,$\gamma$) reactions at the Soudan Underground Laboratory"

Abstract

Tiwari {\it et al.}\ have identified an annual modulation of the $\gamma$-ray flux at the Soudan Underground Laboratory which is strongly correlated to the radon concentration. The $\gamma$-ray flux results from ($\alpha$,$\gamma$) reactions which are induced by the $\alpha$ activity of radon and its daughters. Unfortunately, the quantitative analysis of the $\gamma$-ray flux is based on unrealistic ($\alpha$,$\gamma$) cross sections, and thus the calculated $\gamma$-ray fluxes are not reliable.

arXiv comment3 pages, 1 figure; Phys. Rev. C, accepted for publication

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• Capture of alpha Particles by Isospin-Symmetric Nuclei
• Low-Energy Direct Capture in the 16O(alpha,gamma)20Ne Reaction
• Uncertainty of the astrophysical ${}^{17,18}$O($\alpha$,n)${}^{20,21}$Ne reaction rates and the applicability of the statistical model for nuclei with $A\lesssim 20$
• Observation of annual modulation induced by $\gamma$ rays from ($\alpha$, $\gamma$) reactions at the Soudan Underground Laboratory