The 14th APPEAL Seminar
APPEAL 14-06
Date and Time: 13:30 – 14:30, April 7, 2006
Place: Conference room aside of the central control room, main building, JASRI, SPring-8
Speaker: Prof. Hiro Ejiri
JASRI, Science Advisor, Osaka Univ. emeritus
Title: Neutrinos Studies with Photon Probes
- Double beta decays and neutrino masses -
Abstract: Neutrino properties such as the Majorana nature, the absolute mass scale, and the helicity are key elements for new physics beyond the standard theory of particles. Neutrinos are almost invisible, but can be studied by converting them to their partners, i.e electrons with electric charges, and then electrons to photons, which are visible experimentally.
Double beta decays provide unique opportunities for studying the neutrino properties. They are studied by measuring rare electrons through visible photons. The neutrino nuclear interactions are also simulated by using MeV photons. Recent progresses of double beta decay experiments through high-sensitivity photon detectors and MeV photon probes, including the MOON(Mo Observatory Of Neutrinos), will be briefly discussed.

1. MOON : H. Ejiri, et al, Phys. Rev. Lett. 85 ( 2000) 2917.
2. Double Beta Decays: H. Ejiri, J. Phys. Soc. Jpn., Vol.74, No.8, p.2101-2127
3. DBD network
Contact: Prof. Hiro Ejiri. SPring-8/IIAS/RCNP