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Results of the search for neutrinoless double-β decay in 100Mo with the NEMO-3 experiment
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NEMO-3 Collaboration (Including: Morgan, B. (Ben) and Ramachers, Y.). (2015) Results of the search for neutrinoless double-β decay in 100Mo with the NEMO-3 experiment. Physical Review D (Particles, Fields, Gravitation and Cosmology), 92 . 072011. doi:10.1103/PhysRevD.92.072011
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WRAP_0380076-px-181115-physrevd.92.072011.pdf - Published Version - Requires a PDF viewer. Download (5Mb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevD.92.072011
Abstract
The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double-β (0νββ) decay. We report the final results of a search for 0νββ decays with 6.914 kg of 100Mo using the entire NEMO-3 data set with a detector live time of 4.96 yr, which corresponds to an exposure of 34.3 kg · yr. We perform a detailed study of the expected background in the 0νββ signal region and find no evidence of 0νββ decays in the data. The level of observed background in the 0νββ signal region [2.8–3.2] MeVis 0.44 � 0.13 counts=yr=kg, and no events are observed in the interval [3.2–10] MeV. We therefore derive a lower limit on the half-life of 0νββ decays in 100Mo of T1=2ð0νββÞ > 1.1 × 1024 yr at the 90% confidence level, under the hypothesis of decay kinematics similar to that for light Majorana neutrino exchange. Depending on the model used for calculating nuclear matrix elements, the limit for the effective Majorana neutrino mass lies in the range hmνi < 0.33–0.62 eV. We also report constraints on other lepton-number violating mechanisms for 0νββ decays.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Neutrinos -- Mass | ||||||
| Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 1550-7998 | ||||||
| Official Date: | 21 October 2015 | ||||||
| Dates: |
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| Volume: | 92 | ||||||
| Article Number: | 072011 | ||||||
| DOI: | 10.1103/PhysRevD.92.072011 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Grantová agentura České republiky [Grant Agency of the Czech Republic] (GACR), Centre national de la recherche scientifique (France) (CNRS), Institut national de physique nucléaire et de physique des particules (IN2P3), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), National Science Foundation (U.S.) (NSF) |
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