$\phi _{\boldsymbol ES}$ (${}^{7}\mathrm {Be}$)
INSPIRE search
${}^{7}\mathrm {Be}$ solar-neutrino flux measured via ${{\mathit \nu}_{{e}}}$ elastic scattering. This process is sensitive to all active neutrino flavors, but with reduced sensitivity to ${{\mathit \nu}_{{\mu}}}$, ${{\mathit \nu}_{{\tau}}}$ due to the cross-section difference, $\sigma\mathrm {( {{\mathit \nu}} _{{{\mathit \mu}}, {{\mathit \tau}}} {{\mathit e}} )}$ $\sim{}0.2$ $\sigma\mathrm {( {{\mathit \nu}_{{e}}} {{\mathit e}} )}$. If the ${}^{7}\mathrm {Be}$ solar-neutrino flux involves nonelectron flavor active neutrinos, their contribution to the flux is $\sim{}0.2$ times that of ${{\mathit \nu}_{{e}}}$.
