Solar neutrino responses for ⁷¹Ga and double beta decay isotopes

Solar neutrino nuclear responses (square of nuclear matrix elements NMEs) for ⁷¹Ga and double beta decay (DBD) isotopes are discussed. Subjects discussed include i) neutrino nuclear responses and reduction (renormalization) of axial vector coupling, ii) high energy-resolution charge exchange reactions (CERs) and muon CERs to study neutrino nuclear responses, iii) neutrino nuclear responses for low-lying states in ⁷¹Ga and the Ga anomaly, iv) solar neutrino interactions with DBD isotopes and their contributions to backgrounds at ROI of neutrino-less DBD, and v) CNO neutrino studies by using the CC interactions with ⁷¹Ga and ¹³⁶Xe.