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Measurement of the 2νββ decay half-life of Nd150 and a search for 0νββ decay processes with the full exposure from the NEMO-3 detector

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NEMO-3 Collaboration (Including:

Arnold, R., Augier, C., Baker, J. D., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Brudanin, V., Busto, J. et al.
). (2016) Measurement of the 2νββ decay half-life of Nd150 and a search for 0νββ decay processes with the full exposure from the NEMO-3 detector. Physical Review D (Particles, Fields, Gravitation and Cosmology), 94 (7). 072003. doi:10.1103/PhysRevD.94.072003

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Official URL: http://dx.doi.org/10.1103/PhysRevD.94.072003

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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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Half-life (Nuclear physics), Isoptopes -- Decay, Double beta decay, Neutrinos -- Mass -- Measurement, Laboratoire souterrain de Modane
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Official Date: 11 October 2016
Dates:
DateEvent
11 October 2016Published
11 October 2016Accepted
29 June 2016Submitted
Volume: 94
Number: 7
Article Number: 072003
DOI: 10.1103/PhysRevD.94.072003
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Czech Science Foundation (CSF), Centre national de la recherche scientifique (France) (CNRS), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Science and Technology Facilities Council (Great Britain) (STFC), National Science Foundation (U.S.) (NSF)
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