11 research outputs found
Multi-layer scintillation detector for the MOON double beta decay experiment: Scintillation photon responses studied by a prototype detector MOON-1
An ensemble of multi-layer scintillators is discussed as an option of the
high-sensitivity detector Mo Observatory Of Neutrinos (MOON) for spectroscopic
measurements of neutrino-less double beta decays. A prototype detector MOON-1,
which consists of 6 layer plastic-scintillator plates, was built to study the
sensitivity of the MOON-type detector. The scintillation photon collection and
the energy resolution, which are key elements for the high-sensitivity
experiments, are found to be 1835+/-30 photo-electrons for 976 keV electrons
and sigma = 2.9+/-0.1% (dE/E = 6.8+/-0.3 % in FWHM) at the Qbb ~ 3 MeV region,
respectively. The multi-layer plastic-scintillator structure with good energy
resolution as well as good background suppression of beta-gamma rays is crucial
for the MOON-type detector to achieve the inverted hierarchy neutrino mass
sensitivity.Comment: 8 pages, 16 figures, submitted to Nucl.Instrum.Met
MOON for neutrino-less double beta decays
The MOON (Majorana/Mo Observatory Of Neutrinos) project
aims at studies of the Majorana nature of the neutrino () and
the -mass spectrum by spectroscopic experiments of
neutrino-less double beta decays () with the -mass sensitivity of –30 meV. The solid
scintillator option of the MOON detector is a super ensemble of
multi-layer modules, each being composed by PL scintillator plates
and position-sensitive detector planes with good overall energy
resolution of at the . Thin source films are interleaved
between the detector planes. High localization of the two
tracks enables one to select true signals and reject BG ones. The
multi-layer structure of the detector makes it realistic to build a
compact ton-scale detector. MOON with detector
source is used for studying decays from
, 82Se and other isotopes with large
. Real-time exclusive measurements of low energy
solar neutrinos can be made by observing inverse rays from
solar-ν captures of in delayed coincidence with the
subsequent β decay of 100Tc
MOON (Mo Observatory Of Neutrinos) for double beta decay
The MOON (Molybdenum Observatory Of Neutrinos) project aims at studies of double beta decays with a high sensitivity of < mν >∼0.03 eV and real-time studies of low-energy solar neutrinos. Two β rays from 100 Mo are measured in coincidence for the 0νββ studies. The inverse β rays from solar neutrino captures of 100 Mo are measured in delayed coincidence with the following β decay of 100 Tc. Measurements with good energy resolution and good position resolution enable one to select true signals. A prototype MOON detector (MOON 1) is now under development. The present report describes briefly the outline of the MOON project and the status of MOON 1