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29 March 2024
 
  » arxiv » nucl-ex/0309001

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Liquid Argon Ionization Detector for Double Beta Decay Studies
V. D. Ashitkov ; A. S. Barabash ; S. G. Belogurov ; G. Carugno ; S. I. Konovalov ; F. Massera ; G. Puglierin ; R. R. Saakyan ; V. N. Stekhanov ; V. I. Umatov ;
Date 2 Sep 2003
Subject nucl-ex
AbstractA multisection liquid argon ionization detector was developed by the DBA collaboration to study the double beta- decay of $^{100}$Mo. The experiment was carried out in the Gran Sasso underground laboratory in Italy. The detector design and main characteristics are described. The $eta eta (2 u)$ decay of $^{100}$Mo was observed and its half-life measured: $T_{1/2}=[7.2 pm 0.9(stat) pm 1.8(syst)] imes 10^{18}$ yr. Limits on the 0$ u $ and 0$ u chi ^{0}$ modes of the decay were obtained: $T_{1/2}> 8.4(4.9) imes 10^{21}$ yr and $T_{1/2}> 4.1(3.2) imes 10^{20}$ yr at 68% (90%) C.L., respectively. In addition the upper limits on the $^{42}$Ar content and $^{222}$Rn activity in liquid Ar were found to be $4.3 imes 10^{-21}$ g/g and $1.2 imes 10^{-3}$ Bq/kg, respectively.
Source arXiv, nucl-ex/0309001
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