Investigation of double beta decay with the NEMO-3 detector

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 ($0\nu \beta \beta$) decay and investigate two neutrino double beta decay in seven different isotopically enriched samples (${}^{100}$Mo, ${}^{82}$Se, ${}^{48}$Ca, ${}^{96}$Zr, ${}^{116}$Cd, ${}^{130}$Te and ${}^{150}$Nd). After analysis of the data corresponding to 3.75 y, no evidence for $0\nu \beta \beta$ decay in the ${}^{100}$Mo and ${}^{82}$Se samples was found. The half-life limits at the 90% C.L. are $1.1\cdot 10^{24}$ y and $3.6\cdot 10^{23}$ y, respectively. Additionally for $0\nu \beta \beta$ decay the following limits at the 90% C.L. were obtained, $>1.3\cdot 10^{22}$ y for ${}^{48}$Ca, $>9.2\cdot 10^{21}$ y for ${}^{96}$Zr and $>1.8\cdot 10^{22}$ y for ${}^{150}$Nd. The $2\nu \beta \beta$ decay half-life values were precisely measured for all investigated isotopes.

12 pages, 4 figures, 5 tables; talk at conference on "Fundamental Interactions Physics" (ITEP, Moscow, November 23-27, 2009)

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