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Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of Ca48 with the NEMO-3 detector

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NEMO-3 Collaboration (Including:

Arnold, R., Augier, C., Bakalyarov, A. M., Baker, J. D., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Brudanin, V. et al.
). (2016) Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of Ca48 with the NEMO-3 detector. Physical Review D (Particles, Fields, Gravitation and Cosmology), 93 (11). 112008. doi:10.1103/PhysRevD.93.112008 ISSN 1550-7998.

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Abstract

The NEMO-3 experiment at the Modane Underground Laboratory investigates the double-beta decay of 48Ca. Using 5.25 yr of data recorded with a 6.99 g sample of 48 Ca, approximately 150 double-beta decay candidate events are selected with a signal-to-background ratio greater than 3. The half-life for the two-neutrino double-beta decay of 48Ca is measured to be T2ν1/2=[6.4+0.7−0.6(stat)+1.2 −0.9(syst)]×1019 yr. A search for neutrinoless double-beta decay of 48Ca yields a null result, and a corresponding lower limit on the half-life is found to be T0ν1/2 >2.0×1022 yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of ⟨mββ⟩<6.0–26  eV, with the range reflecting different nuclear matrix element calculations. Limits are also set on models involving Majoron emission and right-handed currents

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: 14 June 2016
Dates:
DateEvent
14 June 2016Published
5 April 2016Accepted
5 April 2016Submitted
Volume: 93
Number: 11
Article Number: 112008
DOI: 10.1103/PhysRevD.93.112008
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 18 January 2017
Date of first compliant Open Access: 19 January 2017
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)
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