Neutrino-induced neutral- and charged-current reactions on ${}^{40}$Ar

Abstract

Neutrino-induced reactions on ${}^{40}$Ar are investigated by shell model for Gamow-Teller transitions and random-phase-approximation (RPA) for forbidden transitions. For the 1${}^{+}$ multipole, an effective interaction in $sd$-$pf$ shell obtained by the extended Kuo-Krenciglowa (EKK) method from chiral interactions is used to study $B(GT)$, charged-current reaction ${}^{40}$Ar (${\nu }_e$, $e^{-}$) ${}^{40}$K, $B(M1)$ in ${}^{40}$Ar and neutral-current reaction ${}^{40}$Ar ($\nu$, $\nu$') ${}^{40}$Ar. A considerable quenching for spin modes is found in the analysis of $B(M1)$, and this quenching is taken into account for the evaluation of the cross sections of the neutral-current reaction. The sensitive dependence of the reaction cross sections on the quenching of the axial-vector coupling constant, $g_A$, is pointed out.

arXiv comment8 pages, 5 figures

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