skip to main content

SciTech ConnectSciTech Connect

Title: Updated constraints on the light-neutrino exchange mechanisms of the 0νββ-decay

The neutrinoless double-beta (0νββ) decay associated with light neutrino exchange mechanisms, which are due to both left-handed V-A and right-handed V+A leptonic and hadronic currents, is discussed by using the recent progress achieved by the GERDA, EXO and KamlandZen experiments. The upper limits for effective neutrino mass m{sub ββ} and the parameters 〈λ〉 and 〈η〉 characterizing the right handed current mechanisms are deduced from the data on the 0νββ-decay of {sup 76}Ge and {sup 136}Xe using nuclear matrix elements calculated within the nuclear shell model and quasiparticle random phase approximation and phase-space factors calculated with exact Dirac wave functions with finite nuclear size and electron screening. The careful analysis of upper constraints on effective lepton number violating parameters assumes a competition of the above mechanisms and arbitrary values of involved CP violating phases.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Comenius University, Mlynská dolina F1, SK-842 48 Bratislava (Slovakia)
  2. (Russian Federation)
  3. (Czech Republic)
Publication Date:
OSTI Identifier:
22492675
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; CP INVARIANCE; CURRENTS; DIRAC EQUATION; DOUBLE BETA DECAY; ELECTRONS; GERMANIUM 76; HADRONS; LEPTON NUMBER; LIMITING VALUES; NEUTRINOS; NUCLEAR MATRIX; PHASE SPACE; RANDOM PHASE APPROXIMATION; SCREENING; SHELL MODELS; WAVE FUNCTIONS; XENON 136