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Inelastic neutron scattering and reactions on Pb isotopes can result in gammarays near the signature endpoint energy in a number of double-beta decayisotopes. In particular, there are gamma-ray transitions in Pb-206,207,208 thatmight produce energy deposits at the 76-Ge Q value in Ge detectors used fordouble-beta decay searches. The levels that produce these gamma rays can beexcited by (n,n'gamma) or (n,xngamma) reactions, but the cross sections aresmall and previously unmeasured. This work uses the pulsed neutron beam at theLos Alamos Neutron Science Center to directly measure reactions of interest todouble-beta decay experiments. The cross section on natural Pb to produce the2041-keV gamma ray from Pb-206 is measured to be 3.6 +/- 0.7 (stat.) +/- 0.3(syst.) mb at ~9.6 MeV. The cross section on natural Pb to produce the 3062-keVgamma ray from Pb-207 and Pb-208 is measured to be 3.9 +/- 0.8 (stat.) +/- 0.4(syst.) mb at the same energy. We report cross sections or place upper limitson the cross sections for exciting some other levels in Pb that have transitionenergies corresponding to Q value in other double-beta decay isotopes.

Neutron inelastic scattering and reactions in natural Pb as a background in neutrinoless double-beta-decay experiments