NDTGamma: A pulse-counting Hadronic Parity Violation experiment

Recent hadronic parity violation results from the NPDGamma and n3He experiments encourage us to envision a complete map of the spin and isospin dependence of the hadronic weak interaction with additional experiments.  The remaining experimentally accessible observables in few-body systems pose special problems.  The statistical precision of the parity-odd neutron spin asymmetry of gammas from n+d->t+γ,   A_γ^nd from a practical target of D₂O would be diluted by the low signal-to-background ratio if one measures the suppressed (~mb) n-D capture cross section using conventional analog integration of current-mode signals.  Given the moderate event rates from this reaction and modern capabilities of high-speed digital pulse-processing electronics, we describe the possibility of detecting individual gamma-rays and discriminating on the 6.2 MeV photopeak.  This would enable the first counting-mode measurement of hadronic parity violation in a few-body system.