Abstract
The feasibility of $^{81}\mathrm{Br}$ as the detector of the solar neutrino flux hinges upon the knowledge of the Gamow-Teller matrix element from the ground state of $^{81}\mathrm{Br}$ to the ${\frac{5}{2}}^{\ensuremath{-}}$ state at 0.457 MeV in $^{81}\mathrm{Kr}$. The possibility of obtaining this matrix element is discussed in terms of the ($p, n$) and ($^{3}\mathrm{He}$, $t$) charge exchange reactions.NUCLEAR REACTIONS $^{81}\mathrm{Br}(p, n)^{81}\mathrm{Kr}$ and $^{81}\mathrm{Br}(^{3}\mathrm{He}, t)^{81}\mathrm{Kr}$; Gamow-Teller transitions; solar neutrino detection.
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