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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:
). (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![[img]](http://wrap.warwick.ac.uk/style/images/fileicons/application_pdf.png) |
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Official URL: http://dx.doi.org/10.1103/PhysRevD.94.072003
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: |
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| 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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| Open Access Version: |
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