Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay ofCa48with the NEMO-3 detector

Abstract

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. Permanent WRAP URL: http://wrap.warwick.ac.uk/85101 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher statement: © 2016 American Physical Society A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. A search for neutrinoless double-beta decay of 48 Ca yields a null result, and a corresponding lower * Deceased.PHYSICAL REVIEW D 93, 112008 (2016) 2470-0010=2016=93(11)=112008 (9) 112008-1 © 2016 American Physical Society limit on the half-life is found to be T 0ν 1=2 > 2.0 × 10 22 yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of hm ββ i < 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.

Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven

“…Finally, the NME combination M E,{L,R} and M me,{L,R} only appear for the dimension-six vector operators C Table 6. The table shows the upper limits on |m ββ | and lower limits on the scales, Λ i , related to the dimension-six, -seven, and -nine operators from the GERDA [87], NEMO [9,11], CUORE [7], and KamLAND-Zen [13] experiments, assuming…”

“…The observation of 0νββ would have far reaching implications: it would demonstrate that neutrinos are Majorana fermions [2], shed light on the mechanism of neutrino mass generation, and give insight on leptogenesis scenarios for the generation of the matterantimatter asymmetry in the universe [3]. The current experimental limits on the halflives are already impressive [4][5][6][7][8][9][10][11][12][13], at the level of T 0ν 1/2 > 5.3 × 10 25 y for 76 Ge [12] and T 0ν 1/2 > 1.07 × 10 26 y for 136 Xe [13], with next generation ton-scale experiments aiming at a sensitivity of T 0ν 1/2 ∼ 10 27−28 y. By itself, the observation of 0νββ would not immediately point to the underlying physical origin of LNV.…”

Search for baryon and lepton number violation in J/ψ→Λc+e−Ablikim1, Ачасов2, Ahmed3 et al. 2019Phys. Rev. D13040View full textAdd to dashboardCite

“…For example, the existence of dark matter is strongly suggested by cosmological observations [5], and searches for particle candidates of the dark sector are carried out both at e þ e − [6] and pp [7] collider experiments and in dedicated direct detection experiments [8]. Similarly, searches for Majorana neutrinos at flavor factory [9] and high energy frontier [10] supplement the neutrino-less double beta decay experiments [11]. The two independent ways of searching for new physics are fruitfully supporting each other.…”

Measurement of the 2νββ decay half-life and search for the 0νββ decay of CdArnold1, Augier2, Baker3 et al. 2017Phys. Rev. DSelf Cite510310View full textAdd to dashboardCite

“…Events from neighboring source foils ( 100 Mo, 96 Zr, and 48 Ca) are sometimes reconstructed within the 150 Nd source foil boundaries due to the vertex resolution of the tracker (see Sec II). In the background model, we fix event rates from these neighboring foils to values measured in dedicated analyses [14,19,20]. Finally, the 2νββ decay of 150 Nd also contributes to the 1e channel as shown in Fig.…”

“…The only constraints in the fit are associated with the internal 214 Bi contribution, which is constrained to the average activity measured in the 1e1α and 1e1γ channels, and the 152 Eu background, which is constrained to the rate measured by the HPGe detector. The contribution from radioactive decays in the neighboring source foils are fixed using the rates measured in dedicated analyses of these foils [14,19,20]. All other background rates and the 2νββ decay rate are fitted without constraints over a total of 446 bins with 32 parameters.…”