Brief ReviewNo Access

MAJORANA NEUTRINO MASSES BY SPECTROSCOPIC STUDIES OF DOUBLE BETA DECAYS AND MOON

HIROYASU EJIRI

RCNP, Osaka University, Ibaraki, Osaka, 567-0047, Japan

https://doi.org/10.1142/S0217732307023778Cited by:19 (Source: Crossref)

Abstract

This is a brief review of spectroscopic studies of neutrino-less double beta decays (0νββ) and the MOON (Mo Observatory Of Neutrinos) project. It aims at studying the Majorana nature of neutrinos and the mass spectrum by spectroscopic studies of 0νββ with ν-mass sensitivity of 〈m_ν〉 ≈ 30 meV. The solid scintillator option of the MOON detector is a super ensemble of multi-layer modules, each being composed by a scintillator plate and two tracking detector planes. Thin ββ source films are interleaved between the detector planes. High localization of the two β tracks enables one to select true signals and reject BG ones by spatial and time correlation analyses. MOON with detector ≠ ββ source is used for studying 0νββ decays from ¹⁰⁰Mo, ⁸²Se and other ββ isotopes with large nuclear sensitivity (large Q_ββ). Real-time exclusive measurements of low energy solar neutrinos can also be made by observing inverse β rays from solar-ν captures of ¹⁰⁰Mo in delayed coincidence with the subsequent β decay of ¹⁰⁰Tc.

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