Non-linearities in the energy response of gas detectors in the regions of the absorption edges of the detection medium are well documented. Monte Carlo calculations show that the non-linearity results from differences in efficiencies for converting absorbed radiation into ionisation for different atomic sub-shells. Energy non-linearity in germanium-based solid-state detectors in the region of t...

The interdiction of nuclear materials during illegal transportation requires both detection of radiation and identification of radionuclides in order to distinguish among the various categories of nuclides and their implied threat. Interdiction regimes, based upon available technologies, were developed rapidly after the tragic events of 9-11. In general, a low resolution or "no-resolution" port...

This paper reports the reliability of efficiency calibrations for gamma-ray detectors using the calculation codes ANGLE and LabSOCS. For experimental verification, three HPGe detectors under various laboratory geometry configurations were used for this study. An overall comparison between experimental and calculated efficiency calibration curves is presented and comments on the various error so...

GENIUS is a proposal for a large volume detector to search for rare events. An array of 40–400 ’naked’ HPGe detectors will be operated in a tank filled with ultrapure liquid nitrogen. After a description of performed technical studies of detector operation in liquid nitrogen and of Monte Carlo simulations of expected background components, the potential of GENIUS for detecting WIMP dark matter,...

The Pd nucleus has been studied with the Mo(B, p2nγ) reaction at 43 MeV incident energy. γ−γ− t, γ−γ− charged particle coincidences and directional correlation ratios were measured using the γ spectrometer formed by four Compton suppressed HPGe detectors and a 4π charged-particle ancillary detector system. The struture of the bands was interpreted within the framework of the cranked shell model...

Low-energy excited states of 210Ra and 208Ra were investigated at the Wright Nuclear Structure Laboratory of Yale University. Fusion evaporation recoils were selected using the gas-filled spectrometer, SASSYER. Delayed γ -rays, following isomeric decays, were detected at the focal plane of SASSYER with a small array of HPGe detectors. Transitions following the proposed J = 8+ isomers were obser...