Česky
English
Committee for collaboration of Czech Republic

with Joint Institute for Nuclear Research in Dubna Login
Measurement of the 2 nu beta beta decay half-life of Nd-150 and a search for 0 nu beta beta decay processes with the full exposure from the NEMO-3 detector

Author
Arnold R. CNRS, IPHC, University of Strasbourg
Fajt Lukáš, Mgr. Institute of Experimental and Applied Physics CTU
Hodák Rastislav, Mgr. Ph.D. Institute of Experimental and Applied Physics CTU
Mamedov Fadahat, Mgr. Institute of Experimental and Applied Physics CTU
Přidal Petr, Ing. Institute of Experimental and Applied Physics CTU
Rukhadze  Ekaterina, Mgr. Institute of Experimental and Applied Physics CTU
Smetana Adam, Mgr., Ph.D. Institute of Experimental and Applied Physics CTU
Smolek Karel, Ing. Ph.D. Institute of Experimental and Applied Physics CTU
Štekl Ivan, doc. Ing. CSc. Institute of Experimental and Applied Physics CTU
et al.  different institutions

Year
2016

Scientific journal
Physical Review D, 94 (7), 072003

Web


Abstract
We present results from a search for neutrinoless double-beta (0 nu beta beta) decay using 36.6 g of the isotope Nd-150 with data corresponding to a live time of 5.25 y recorded with the NEMO-3 detector. We construct a complete background model for this isotope, including a measurement of the two-neutrino double-beta decay half-life of T-1/2(2 nu) = [9.34 +/- 0.22(stat)(-0.60)(+0.62)(syst)] x 10(18) y for the ground state transition, which represents the most precise result to date for this isotope. We perform a multivariate analysis to search for 0 nu beta beta decays in order to improve the sensitivity and, in the case of observation, disentangle the possible underlying decay mechanisms. As no evidence for 0 nu beta beta decay is observed, we derive lower limits on half-lives for several mechanisms involving physics beyond the standard model. The observed lower limit, assuming light Majorana neutrino exchange mediates the decay, is T-1/2(0 nu) > 2 > 2.0 x 10(22) y at the 90% C.L., corresponding to an upper limit on the effective neutrino mass of < m(nu)> < 1.6-5.3 eV.

Cite article as:
R. Arnold, L. Fajt, R. Hodák, F. Mamedov, P. Přidal, E. Rukhadze , A. Smetana, K. Smolek, I. Štekl, . et al., "Measurement of the 2 nu beta beta decay half-life of Nd-150 and a search for 0 nu beta beta decay processes with the full exposure from the NEMO-3 detector", Physical Review D, 94 (7), 072003 (2016)