Nuclear responses for neutrinos and Mo observatory of neutrinos

Nuclear responses for neutrinos and neutrino studies in Mo nuclei are briefly reported. Nuclear spin-isospin responses for neutrinos are crucial for neutrino studies in nuclei. Spin-isospin responses for solar neutrinos, supernova neutrinos and neutrinos involved in double-beta decays are discussed. It is of great interest to study neutrino masses and low energy solar neutrinos, It is shown that it is possible to carry out with Mo-100 both spectroscopic studies of double-beta decays with the sensitivity of the order of [m(nu)] approximate to 0.03 eV and real-time exclusive studies of the low energy solar neutrinos.