scholarly journals Status of calculations of the nuclear matrix elements for double beta decay

2012 ◽  
Vol 375 (4) ◽  
pp. 042025 ◽  
Author(s):  
Vadim Rodin
Keyword(s):  
Beta Decay ◽  
Nuclear Matrix ◽  
Double Beta Decay ◽  
Matrix Elements

scholarly journals Variation of NMEs of 0νββ for 48Ca with different components of NN interaction

2019 ◽  
Vol 223 ◽  
pp. 01057
Author(s):  
Shahariar Sarkar ◽  
Pawan Kumar ◽  
Kanhaiya Jha ◽  
P.K. Raina
Keyword(s):  
Beta Decay ◽  
Nuclear Matrix ◽  
Model Space ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Central Component ◽  
Spin Orbit ◽  
Matrix Elements ◽  
Nucleon Interaction ◽  
Total Interaction

We examine the sensitivity of nuclear matrix elements (NMEs) for light-neutrino exchange mechanism of neutrinoless double beta decay (0νββ) for 48Ca to the various components of two-nucleon interaction, GXPF1A, in fp model space. It is found that the contribution in NMEs coming from the central component is close to contribution from total interaction. The spin-orbit and tensor components are found canceling the contribution of each other.

scholarly journals EVIDENCE FOR NEUTRINOLESS DOUBLE BETA DECAY

2001 ◽  
Vol 16 (37) ◽  
pp. 2409-2420 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS ◽  
A. DIETZ ◽  
H. L. HARNEY ◽  
I. V. KRIVOSHEINA
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Nuclear Matrix ◽  
Bayesian Method ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Matrix Elements ◽  
Majorana Particle ◽  
Best Value ◽  
Measuring Period

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 [Formula: see text] (95% c.l.) with a best value of 1.5 × 1025 y . The deduced value of the effective neutrino mass is, with the nuclear matrix elements from Ref. 1, <m> = (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.

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