Nuclear Seminars 2014 Spring
|| Special Nuclear Seminar:
Double beta decay and matter dominated universe
||Prof. Tadafumi Kishimoto
||Research Center for Nuclear Physics, Osaka University, Japan
||Tuesday, January 14, 2014
||4:00 - 5:00 pm EST
||Nieuwland Science Hall, Room 124
Study of neutrino-less double
beta (0nbb) decay becomes of particular importance after
the confirmation of neutrino oscillation which shows that
neutrinos have mass. They could then be Majorana particles
which violate lepton number conservation. Once lepton number
non-conservation is verified, we have a scenario to explain
how our matter dominated universe is realized dynamically.
It is the leptogenesys combined with CP violation in lepton
sector.0nbb decay is only a known process to verify Majorana
nature of neutrino.
We have developed the CANDLES detector system for the study
of 48-Ca 0nbb decay. The 48-Ca has the highest Q value (4.3
MeV) among double beta decay nuclei. It means that the large
decay rate for a given neutrino mass and the least background.
We constructed a detector at the Kamioka underground laboratory.
I will describe the current status of this research in the
world and our experiment.