Constraining The Solar Neutrino Survival Probability Curve By Using Li-6, Li-7, C-12, O-18, F-19, And Ca-42 Nuclear Targets

Precise measurement of the survival probability P-ee of solar electron neutrino (nu(e)) as a function of its energy [P-ee (E-nu e)] is one of the key issues in neutrino physics. Current P-ee data, due to their limited accuracy, still allow for nonstandard interactions (NSIs) to be alternatives to the standard one, which is based on the MSW-LMA prediction. In order to determine P-ee values at several values of E-nu e with higher accuracy, we propose to use several target nuclei with different threshold energies for nu(e) detection. We examined charged-current (CC) responses of various nuclei seeking the ones: (a) having large and concentrated Gamow-Teller (GT) transition strength in the low excitation-energy region, and (b) having appropriate and a variety of reaction Q values, i.e., approximate to 1 to 17 MeV, in the (nu(e), e(-)) reaction. As a result, we found that systematic solar nu(e) measurements with target nuclei Li-6, Li-7, C-12, O-18, F-19, and Ca-42 can put strong constraints on the P-ee (E nu(e)) curve and thus on these NSI models. In addition, we notice that three of these nuclei, Li-6, Li-7, and C-12, have large and concentrated neutral-current (NC) responses with detection threshold-energies of 3.56, 0.48, and 15.11 MeV, respectively. Note that the NC measurement is flavor independent. Thus, the measured results should represent the original strength of nu(e) from the Sun.