Abstract
We investigate several Pb) and Ge) reactions. We measure γ-ray production from Pb) reactions that can be a significant background for double-β decay experiments which use lead as a massive inner shield. Particularly worrisome for Ge-based double-β decay experiments are the 2041-keV and 3062-keV γ rays produced via Pb). The former is very close to the double-β decay endpoint energy and the latter has a double escape peak energy near the endpoint. We discuss the implications of these γ rays on past and future double-β decay experiments and estimate the cross section to excite the level that produces the 3062-keV γ ray. Excitation γ-ray lines from Ge) reactions are also observed. We consider the contribution of such backgrounds and their impact on the sensitivity of next-generation searches for neutrinoless double-β decay using enriched germanium detectors.
- Received 3 April 2007
DOI:https://doi.org/10.1103/PhysRevC.77.054614
©2008 American Physical Society