Abstract
Half life limits for theββ 2v+0v decay of76Ge to excited states of76Se are deduced from the background spectrum of a passive shielding of zone refined germanium (139.5 kg). A special low-activity HPGe-detector (102 ccm) was mounted inside this shielding to search for the transition photons emitted in the decay of the excited states. The resulting limits for the (0+→2 +1 and the (0+→0 +1 ) transition are 6.3·1020 y (68%cl).
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This work is supported by the Bundesministerium für Forschung und Technologie der Bundesrepublik Deutschland and the State Committee of Atomic Energy of the USSR. We are very grateful to the Laboratorio Nazionale del Gran Sasso, INFN and in particular to Prof. N. Cabibbo and Prof. E. Bellotti for the generous support.
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Beck, M., Bockholt, J., Echternach, J. et al. New half life limits for theβ β 2v+0v decay of76Ge to the excited states of76Se from the Heidelberg-Moscow ββ experiment. Z. Physik A - Hadrons and Nuclei 343, 397–400 (1992). https://doi.org/10.1007/BF01289815
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DOI: https://doi.org/10.1007/BF01289815