Abstract
Independent analysis of the spectra from the Heidelberg-Moscow experiment has been carried out. A direct comparison of the peak intensities in the spectra allows for the conclusion that in the energy range up to 3200 keV the background is due to the detection of γ rays from the decay of trace impurities of anthropogenic and cosmogenic nuclides occurring in the apparatus between the HPGe detectors and the main (Pb and Cu) shielding. The 226Ra, 214Pb, and 214Bi γ rays observed in the spectra are shown to arise in the 226Ra rather than 238U decay chain. The estimates of the expected intensities of the weak 214Bi γ rays in the spectrum region around Q ββ(76Ge) = 2039 keV do not contradict the observation of the peak at 2039 keV as claimed by Klapdor-Kleingrothaus and coauthors.
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Gromov, K.Y., Bednyakov, V.A., Fominykh, V.I. et al. Background structure in the Heidelberg-Moscow experiment on the search and investigation of double beta decay of 76Ge1 . Phys. Part. Nuclei Lett. 3, 157–164 (2006). https://doi.org/10.1134/S1547477106030034
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DOI: https://doi.org/10.1134/S1547477106030034