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Neutrinoless double beta decay in 76^{76}Ge for transitions to excited states of 76^{76}Se

1985
12 pages
Published in:
  • Nuovo Cim.A 85 (1985) 1, 19-30
DOI:
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Abstract: (submitter)
Neutrinoless double beta decays of 76Ge(Jπ=0+)^{76}Ge (J^{\pi} = 0^{+}) leading to the excited states (Jπ=21+,E=559.1(J^{\pi} = 2_{1}^{+}, E = 559.1 keV and Jπ=02+,E=1122.3J^{\pi} = 0_{2}^{+}, E = 1122.3 keV) of 76^{76}Se have been investigated. After some theoretical considerations about the information one can extract from the experimental data, we report on a measurement made with a Ge (Li) detector and nine NaI detectors in a 4π4 \pi geometry. The following limits have been obtained after 1079 hours, of statistics T1/2(0+→21+)⩾5.5⋅1021yT_{1/2}(0^{+} \rightarrow 2_{1}^{+}) \geqslant 5.5·10^{21} y and T1/2(0+→02+)⩾2.3⋅1021yT_{1/2}(0^{+} \rightarrow 0_{2}^{+}) \geqslant 2.3·10^{21} y (at 68% confidence level).