Dong-Ming Mei

Pulse shape analysis in segmented detectors as a technique for background reduction in Ge double-beta decay experiments

The need to understand and reject backgrounds in Ge-diode detector double-beta decay experiments has given rise to the development of pulse shape analysis in such detectors to discern single-site energy deposits from multiple-site deposits. Here, we extend this analysis to segmented Ge detectors to study the effectiveness of combining segmentation with pulse shape analysis to identify the multiplicity of the energy deposits.

Neutron inelastic scattering processes as a background for double-{beta} decay experiments

We investigate several Pb(n,n{sup }{gamma}) and Ge(n,n{sup }{gamma}) reactions. We measure {gamma}-ray production from Pb(n,n{sup }{gamma}) reactions that can be a significant background for double-{beta} decay experiments which use lead as a massive inner shield. Particularly worrisome for Ge-based double-{beta} decay experiments are the 2041-keV and 3062-keV {gamma} rays produced via Pb(n,n{sup }{gamma}). The former is very close to the {sup 76}Ge double-{beta} decay endpoint energy and the latter has a double escape peak energy near the endpoint. We discuss the implications of these {gamma} rays on past and future double-{beta} decay experiments and estimate the cross section to excite the level that produces the 3062-keV {gamma} ray. Excitation {gamma}-ray lines from Ge(n,n{sup }{gamma}) reactions are also observed. We consider the contribution of such backgrounds and their impact on the sensitivity of next-generation searches for neutrinoless double-{beta} decay using enriched germanium detectors.

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

Inelastic neutron scattering and reactions on Pb isotopes can result in

A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments

ensuremath{gamma}

Depth‐Sensitivity Relation (DSR) for Underground Laboratories

rays near the signature end-point energy in a number of

Inelastic neutron scattering on natural copper as a background for neutrinoless double-beta decay experiments

ensuremath{beta}ensuremath{beta}

Inelastic neutron scattering as a possible background for neutrinoless double-beta decay experiments

isotopes. In particular, there are

Depletion of ^39Ar for Direct Dark Matter Detection Experiments

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Pulse Shape and Segmentation Analysis in Germanium Detectors for Double-Beta Decay

-ray transitions in

Neutron excitation of lead and copper in search for specific excited state decays

^{206,207,208}mathrm{Pb}