Neutrino Capture Reactions on $^{40}$Ar

Gamow-Teller (GT) strength in $^{40}$Ar is studied by shell-model calculations with monopole-based universal intearction, which has tensor components of $π$ρ$-meson exchanges. Calculated GT strength is found to be consistent with the experimental data obtained by recent ($p, n$) reactions. Neutrino capture cross sections on$^{40}$Ar for solar neutrinos from$^{8}$B are found to be enhanced compared with previous calculations. The reaction cross sections for multipoles other than$0^{+}$and$1^{+}$ are obtained by random-phase approximation (RPA). Their contributions become important for neutrino energies larger than 50 MeV.

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