NEMO 3 double beta decay experiment: latest results

Abstract

The double beta decay experiment NEMO~3 has been taking data since February 2003. The aim of this experiment is to search for neutrinoless decay and investigate two neutrino double beta decay in seven different enriched isotopes (${}^{100}$Mo,${}^{82}$Se, ${}^{48}$Ca, ${}^{96}$Zr, ${}^{116}$Cd, ${}^{130}$Te and ${}^{150}$Nd). After analysis of the data corresponding to 693 days, no evidence for $0\nu \beta \beta$ decay in ${}^{100}$Mo and ${}^{82}$Se was found. The half-life limits at 90% C.L. are $5.8\cdot 10^{23}$ y and $2.1\cdot 10^{23}$ y, respectively. Using $\sim$ 940 days of data, preliminary results were obtained for ${}^{48}$Ca, ${}^{96}$Zr and ${}^{150}$Nd. For two neutrino decay half-life values were measured, $T_{1/2}{(}^{48}\mathrm{Ca})=[4.4_{-0.4}^{+0.5}(stat)\pm 0.4(syst)]\cdot 10^{19}$ y, $T_{1/2}{(}^{96}\mathrm{Zr})=[2.3\pm 0.2(stat)\pm 0.3(syst)]\cdot 10^{19}$ y and $T_{1/2}{(}^{150}\mathrm{Nd})=[9.2_{-0.22}^{+0.25}(stat)\pm 0.62(syst)]\cdot 10^{18}$ y. Also for $0\nu \beta \beta$ decay the following limits at 90% C.L. were obtained, $>1.3\cdot 10^{22}$ y for ${}^{48}$Ca, $>8.6\cdot 10^{21}$ y for ${}^{96}$Zr and > 1.8 \cdot 10^{22}$yfor$^{150}$Nd.

11 pages included 8 figures and 3 tables, Invited talk at the CISPN ("Columbia Int. Symp. on Neutrino Physics"; Columbia, USA, May 15-17, 2008) and at the 2nd Int. Conf. NPAE-2008 (Kyiv, Ukraine, June 9-15, 2008)

References in corpus (17)

• Confidence Level Computation for Combining Searches with Small Statistics
• Anatomy of nuclear matrix elements for neutrinoless double-beta decay
• The influence of pairing on the nuclear matrix elements of the neutrinoless double beta decays
• First results of the search of neutrinoless double beta decay with the NEMO 3 detector
• Technical design and performance of the NEMO3 detector
• The Absolute Neutrino Mass Scale, Neutrino Mass Spectrum, Majorana CP-Violation and Neutrinoless Double-Beta Decay
• Nuclear matrix elements of neutrinoless double beta decay with improved short-range correlations
• A Calorimetric Search on Double Beta Decay of 130Te
• Double beta decay of ${}^{48}$Ca
• Double Beta Decays of Mo-100 and Nd-150
• Limits on different Majoron decay modes of ${}^{100}$Mo and ${}^{82}$Se for neutrinoless double beta decays in the NEMO-3 experiment
• Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment
• On the Neutrino Mass Spectrum and Neutrinoless Double-Beta Decay
• Neutrinoless Double Beta Decay in Heavy Deformed Nuclei
• Average and recommended half-life values for two neutrino double beta decay: upgrade'05
• Study of 2b-decay of Mo-100 and Se-82 using the NEMO3 detector
• Status of Neutrino Masses and Mixing and Future Perspectives

Cited by in corpus (4)

• TeV Scale See-Saw Mechanisms of Neutrino Mass Generation, the Majorana Nature of the Heavy Singlet Neutrinos and $\betabeta$-Decay
• Uncovering Multiple CP-Nonconserving Mechanisms of $\betabeta$-Decay
• Study of neutron-induced background and its effect on the search of 0$\nu \beta \beta$ decay in ${}^{124}\mathrm{Sn}$
• Combining Stochastics and Analytics for a Fast Monte Carlo Decay Chain Generator