Second unique forbidden β decay of [sup 115]In and neutrino mass

2011 ◽  
Author(s):  
R. Dvornický ◽  
F. Šimkovic ◽  
Osvaldo Civitarese ◽  
Ivan Stekl ◽  
Jouni Suhonen
Keyword(s):  
Neutrino Mass ◽  
Β Decay

scholarly journals Direct measurement of the mass difference of As72−Ge72 rules out As72 as a promising β -decay candidate to determine the neutrino mass

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Z. Ge ◽  
T. Eronen ◽  
A. de Roubin ◽  
D. A. Nesterenko ◽  
M. Hukkanen ◽  
...  
Keyword(s):  
Direct Measurement ◽  
Neutrino Mass ◽  
Mass Difference ◽  
Β Decay

Estimates of Molecular Effects on the Neutrino Mass Determination by Triton β Decay

1986 ◽  
Vol 55 (11) ◽  
pp. 3806-3812 ◽  
Author(s):  
Jiro Arafune ◽  
Nobuaki Koga ◽  
Keiji Morokuma ◽  
Tadashi Watanabe
Keyword(s):  
Neutrino Mass ◽  
Mass Determination ◽  
Β Decay ◽  
Molecular Effects

Corrections to the tritium β decay spectrum arising from radiative and atomic effects and their relationship to neutrino mass experiments

1989 ◽  
Vol 67 (9) ◽  
pp. 904-911 ◽  
Author(s):  
S. Weisnagel ◽  
J. Law
Keyword(s):  
Neutrino Mass ◽  
Reference Spectrum ◽  
Β Decay ◽  
Final Density ◽  
Original Analysis ◽  
Sample Data ◽  
Inner Bremsstrahlung ◽  
The Difference ◽  
Best Fit ◽  
Neutrino Decay

The process of inner bremsstrahlung is examined for the β− decay of 3H. These radiative effects are then combined with atomic corrections in a more complete theoretical reference spectrum consisting of both light and heavy neutrino decay in accordance with recently published results of neutrino mass experiments. Due to the unusual nature of the experimental detector, final density of states is modified to provide a decay rate as a function of recorded energy. This reference spectrum is compared with experimental data using the exact method employed in the original analysis. It is found that previously reported low energy Kurie spectrum deviations are still present in the sample data, corresponding to a best fit for neutrino mass mν = 17.2 keV and mixing probability R = 2.5%. The origin of the difference between the conclusions reached here and those of earlier cited works is briefly discussed.

scholarly journals Nuclear transition matrix elements for neutrinoless double-β decay within mechanisms involving light Majorana neutrino mass and right-handed current

2019 ◽  
Vol 28 (01n02) ◽  
pp. 1950001
Author(s):  
Yash Kaur Singh ◽  
R. Chandra ◽  
K. Chaturvedi ◽  
Tripti Avasthi ◽  
P. K. Rath ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Transition Matrix ◽  
Weak Coupling ◽  
Majorana Neutrino ◽  
Nuclear Transition ◽  
Matrix Elements ◽  
Β Decay ◽  
Hartree Fock ◽  
Transition Matrix Elements ◽  
Majorana Neutrino Mass

Employing the projected-Hartree-Fock-Bogoliubov (PHFB) model in conjunction with four different parametrizations of pairing plus multipolar effective two-body interaction and three different parametrizations of Jastrow short-range correlations, nuclear transition matrix elements for the neutrinoless double-[Formula: see text] decay of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] isotopes are calculated within mechanisms involving light Majorana neutrino mass and right-handed current. Statistically, model specific uncertainties in sets of twelve nuclear transition matrix elements are estimated by calculating the averages along with the standard deviations. For the considered nuclei, the most stringent extracted on-axis limits on the effective light Majorana neutrino mass [Formula: see text], the effective weak coupling of right-handed leptonic current with right-handed hadronic current [Formula: see text], and the effective weak coupling of right-handed leptonic current with left-handed hadronic current [Formula: see text] from the observed limit on half-life [Formula: see text] of [Formula: see text] isotope are [Formula: see text][Formula: see text]eV, [Formula: see text] and [Formula: see text], respectively.

scholarly journals First direct neutrino-mass measurement with sub-eV sensitivity

2021 ◽  
Author(s):  
M. Aker ◽  
M. Bottcher ◽  
A. Beglarian ◽  
J. Behrens ◽  
A. Berlev ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Precision Measurement ◽  
Mass Measurement ◽  
Β Decay ◽  
High Precision Measurement ◽  
Effective Electron ◽  
Upper Limit ◽  
Neutrino Mass Measurement ◽  
Katrin Experiment ◽  
Best Fit

Abstract We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, mν, via a high-precision measurement of the tritium β-decay spectrum close to its endpoint at 18.6 keV. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by 25% with respect to the first campaign. A sensitivity on mν of 0.7 eV/c2 at 90% confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields mν2=(0.26±0.34) eV2/c4, resulting in an upper limit of mν<0.9 eV/c2 (90% CL). By combining this result with the first neutrino mass campaign, we find an upper limit of mν<0.8 eV/c2 (90% CL).

scholarly journals Radiative tritium β-decay and the neutrino mass

2004 ◽  
Vol 598 (3-4) ◽  
pp. 188-196 ◽  
Author(s):  
Susan Gardner ◽  
Véronique Bernard ◽  
Ulf-G. Meißner
Keyword(s):  
Neutrino Mass ◽  
Β Decay
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