Limits on massive Majorana neutrinos from neutrinoless double β-decay

1981 ◽  
Vol 102 (1) ◽  
pp. 35-36 ◽  
Author(s):  
J.J. Simpson
Keyword(s):  
Β Decay ◽  
Majorana Neutrinos ◽  
Double Β Decay

Nuclear transition matrix elements for neutrinoless double-β decay of 76Ge isotope within PHFB approach

2019 ◽  
Vol 28 (11) ◽  
pp. 1950096
Author(s):  
P. K. Rath ◽  
A. Kumar ◽  
R. Chandra ◽  
R. Gautam ◽  
P. K. Raina ◽  
...  
Keyword(s):  
Transition Matrix ◽  
Tensor Decomposition ◽  
Nuclear Transition ◽  
Matrix Elements ◽  
Spin Tensor ◽  
Β Decay ◽  
Hartree Fock ◽  
Transition Matrix Elements ◽  
Majorana Neutrinos ◽  
Double Β Decay

Employing projected–Hartree–Fock–Bogoliubov (PHFB) model, nuclear transition matrix elements (NTMEs) [Formula: see text] for the neutrinoless double-[Formula: see text] decay of [Formula: see text]Ge isotope are calculated within mechanisms involving light as well as heavy Majorana neutrinos, and classical Majorons. By considering the spin-tensor decomposition of realistic KUO and empirical JUN45 effective two-body interactions, it is noticed that the effect due to SRC on NTMEs [Formula: see text] and [Formula: see text] involving the exchange of light and heavy Majorana neutrinos, respectively, is maximally incorporated by the central part of the effective two-body interaction, which varies by a small amount with the inclusion of spin-orbit and tensor components. Presently, the model-dependent uncertainties in the average NTMEs [Formula: see text] and [Formula: see text] turn out to be about 10% and 37%, respectively.

scholarly journals Probing Majorana neutrinos with double-β decay

Science ◽  
2019 ◽  
Vol 365 (6460) ◽  
pp. 1445-1448 ◽  
Author(s):  
M. Agostini ◽  
A. M. Bakalyarov ◽  
M. Balata ◽  
I. Barabanov ◽  
L. Baudis ◽  
...  
Keyword(s):  
Half Life ◽  
Particle Physics ◽  
Liquid Argon ◽  
Majorana Neutrino ◽  
Majorana Fermions ◽  
Β Decay ◽  
Active Liquid ◽  
Majorana Neutrinos ◽  
Double Β Decay ◽  
Majorana Neutrino Mass

A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-β (0νββ) decay, a matter-creating process without the balancing emission of antimatter. The GERDA Collaboration searches for the 0νββ decay of 76Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg⋅year, we observe no signal and derive a lower half-life limit of T1/2 > 0.9 × 1026 years (90% C.L.). Our T1/2 sensitivity, assuming no signal, is 1.1 × 1026 years. Combining the latter with those from other 0νββ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 to 0.16 electron volts.

scholarly journals Search for double- β decay of Ge76 to excited states of Se76 with the majorana demonstrator

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
I. J. Arnquist ◽  
F. T. Avignone ◽  
A. S. Barabash ◽  
C. J. Barton ◽  
F. E. Bertrand ◽  
...  
Keyword(s):  
Excited States ◽  
Β Decay ◽  
Double Β Decay

scholarly journals Neutron inelastic scattering and reactions in natural Pb as a background in neutrinoless double-β-decay experiments

2009 ◽  
Vol 79 (5) ◽  
Author(s):  
V. E. Guiseppe ◽  
M. Devlin ◽  
S. R. Elliott ◽  
N. Fotiades ◽  
A. Hime ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Β Decay ◽  
Neutron Inelastic Scattering ◽  
Double Β Decay
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