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Spectra of electrons from beta decays of 144Ce–144Pr nuclei have been measured and analyzed in order to find a contribution from a heavy neutrino. For the neutrino with the mass mνH in the interval of 150–350 keV, a new upper bound |UeH|2 ≤ (2−5) × 10−3 at 90% C.L. has been found for the mixing parameter.
The MATS project for research on short-lived nuclides using ion traps is described. The physical program is aimed at performing nuclear-physical and astrophysical research using exotic nuclei which are near their boundaries of nucleonic stability. The project is devoted to precision measurements of the masses (total binding energy) and spectroscopic characteristics of ideally separated nuclides in...
In-situ characterization of samples by experts, using high resolution gamma spectrometers, is required if low resolution NaI detector-based hand-held radionuclide identification devices are unable to provide definite spectral identifications. In some remote locations, the use of liquid N-2 cooled HPGe detectors is not possible. Electrically cooled HPGe detectors are not always a feasible alternative,...
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