Double Beta decays and Related Subjexts by Ultra Rare-process Nuclear Spectroscopy

1. Double beta decays and neutrino(1) Neutrinoless Double beta decays of ^<100>Mo have been measuredfor studying fundamental properties of neutrino and the validity of electro-weak标准模型means of ELEGANT V detector. (2) Double beta decays with two neutrino of ^<100>Mo and ^<116>Cd werestudied and the finite half lives for both nuclei observed. (3) New type drift chambers，这是非常敏感的alpha particles emitted from residual radioactivities，been installed in the ELEGANTS V detector 2. Search for dark matterNew particles of dark mattercandidates have been searched by means of large NaI with the total mass of 0.76ton in ELEGANTS VNaI detector was found to be very sensitive to spin-coupled dark matter candidates.3. TestParticle and Nuclear PhysicsElectron stability and nucleon stability have of Conservation Laws of Particle and Nuclear PhysicsElectron stability and nucleon stabilitybeen checked by using the electron and NaI detector itself in ELEGANTS V detector. Thesestabilities give one of the highest upperlimits of charge nonconserving decay of electron，breakings of Pauli principleand mode independent nucleon decays.4. Ultra-rare Nuclear reactionsELEGANTS IIIs detector withneutron scatterer应该在搜索中选择neutron events such as d-dfusion at room temperature. The observed fusion rate was obtained as <1.6 / 10^<-24> （ddn）fusions/(dd)pair/sec.5. Radioactivity in MeteoritesGamma rays from radioactivities in meteoriteswere measured by means of ELEGANTS IIIs detector. Concentration of ^<26>Al in large meteorites withtotal mass of several hundred gram可以measured nondestructively in an order of dpm/kg。

1. Double beta decays and neutrino(1) Neutrinoless Double beta decays of ^<100>Mo have been measured for studying fundamental properties of neutrino and the validity of electro-weak standard model means of ELEGANT V detector. (2) Double beta decays with two neutrino of ^<100>Mo and ^<116>Cd were studied and the finite half lives for both nuclei were observed. (3) New type drift chambers, which are very sensitive to alpha particles emitted from residual radioactivities, have been installed in the ELEGANTS V detector.2. Search for dark matterNew particles of dark matter candidates have been searched by means of large NaI with the total mass of 0.76ton in ELEGANTS V detector. NaI detector was found to be very sensitive to spin-coupled dark matter candidates.3. Test of Conservation Laws of Particle and Nuclear PhysicsElectron stability and nucleon stability have been checked by using the electron and nucleon in NaI detector itself in ELEGANTS V detector. These stabilities give one of the highest upperlimits of charge nonconserving decay of electron, breakings of Pauli principle, and mode independent nucleon decays.4. Ultra-rare Nuclear reactionsELEGANTS IIIs detector with neutron scatterer was shown to be very sensitive in the search for rare neutron events such as d-d fusion at room temperature. The observed fusion rate was obtained as <1.6・10^<-24> (ddn) fusions/(dd)pair/sec.5. Radioactivity in MeteoritesGamma rays from radioactivities in meteorites were measured by means of ELEGANTS IIIs detector. Concentration of ^<26>Al in large meteorites with total mass of several hundred gram can be measured nondestructively in an order of dpm/kg.