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Title: Unique forbidden beta decays and neutrino mass

The measurement of the electron energy spectrum in single β decays close to the endpoint provides a direct determination of the neutrino masses. The most sensitive experiments use β decays with low Q value, e.g. KATRIN (tritium) and MARE (rhenium). We present the theoretical spectral shape of electrons emitted in the first, second, and fourth unique forbidden β decays. Our findings show that the Kurie functions for these unique forbidden β transitions are linear in the limit of massless neutrinos like the Kurie function of the allowed β decay of tritium.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Dzhelepov Laboratory of Nuclear Problems, JINR 141980 Dubna (Russian Federation)
  2. (Slovakia)
  3. Comenius University, Mlynská dolina F1, SK-842 48 Bratislava (Slovakia)
  4. (Russian Federation)
  5. (Czech Republic)
Publication Date:
OSTI Identifier:
22492664
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1686; Journal Issue: 1; Conference: MEDEX'15: Workshop on calculation of double-beta-decay matrix elements, Prague (Czech Republic), 9-12 Jun 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BETA DECAY; ELECTRON EMISSION; ELECTRON SPECTRA; ELECTRONS; ENERGY SPECTRA; FERMI PLOT; MASS; NEUTRINOS; Q-VALUE; RHENIUM; TRITIUM