EVIDENCE FOR NEUTRINOLESS DOUBLE BETA DECAY
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- 7 December 2001
- journal article
- Published by World Scientific Pub Co Pte Ltd in Modern Physics Letters A
- Vol. 16 (37), 2409-2420
- https://doi.org/10.1142/s0217732301005825
Abstract
The data of the Heidelberg–Moscow double beta decay experiment for the measuring period August 1990–May 2000 (54.9813 kg y or 723.44 molyears), published recently, are analyzed using the potential of the Bayesian method for low counting rates. First evidence for neutrinoless double beta decay is observed giving first evidence for lepton number violation. The evidence for this decay mode is 97% (2.2σ) with the Bayesian method, and 99.8% c.l. (3.1σ) with the method recommended by the Particle Data Group. The half-life of the process is found with the Bayesian method to be (95% c.l.) with a best value of 1.5 × 1025y. The deduced value of the effective neutrino mass is, with the nuclear matrix elements from Ref. 1, = (0.11–0.56) eV (95% c.l.), with a best value of 0.39 eV. Uncertainties in the nuclear matrix elements may widen the range given for the effective neutrino mass by at most a factor 2. Our observation which at the same time means evidence that the neutrino is a Majorana particle, will be of fundamental importance for neutrino physics.Keywords
This publication has 15 references indexed in Scilit:
- Latest results from the HEIDELBERG-MOSCOW double beta decay experimentThe European Physical Journal A, 2001
- Determination of theDouble Beta DecayValuePhysical Review Letters, 2001
- THEORY OF NEUTRAL PARTICLES: MCLENNAN-CASE CONSTRUCT FOR NEUTRINO, ITS GENERALIZATION, AND A NEW WAVE EQUATIONInternational Journal of Modern Physics A, 1996
- Calculation of 2ν and 0ν Double-Beta Decay RatesEurophysics Letters, 1990
- Double Beta Decay and Majorana NeutrinoProgress of Theoretical Physics Supplement, 1985
- Reformulation of the Majorana Theory of the NeutrinoPhysical Review B, 1957
- Parity Nonconservation and the Theory of the NeutrinoPhysical Review B, 1957
- On Transition Probabilities in Double Beta-DisintegrationPhysical Review B, 1939
- Sulla Simmetria Tra Particelle e AntiparticelleIl Nuovo Cimento (1869-1876), 1937
- Teoria simmetrica dell’elettrone e del positroneIl Nuovo Cimento (1869-1876), 1937