Speaker
Description
Sterile neutrino of keV-scale mass is one of strong dark matter candidates. One of the ways for observing “sterile” neutrino is using nuclear beta decays. Non-zero mixing of sterile neutrino to electron neutrino allows them being emitted in nuclear beta decays, which modifies the shape of beta decay spectrum by adding a 4-th spectral component with reduced end-point energy. This modification produces the “kink” structure at the end-point of the sterile neutrino contribution in the beta spectrum, where is the decay Q value minus the mass of sterile neutrino. MAGNETO-ν experiment is a search for keV sterile neutrino in 241Pu beta decays with magnetic quantum sensors. Enriched 241Pu sources will be fully embedded into the magnetic quantum sensors and full decay energies from 241Pu beta decays will be measured with an energy resolution of O(10 eV). In this talk, experimental overview as well as our first 241Pu measurement with a preliminary limit on keV sterile neutrino mixing will be presented.
