10 research outputs found
A multi-detector array for high energy nuclear e+e- pair spectrosocopy
A multi-detector array has been constructed for the simultaneous measurement
of energy- and angular correlation of electron-positron pairs produced in
internal pair conversion (IPC) of nuclear transitions up to 18 MeV. The
response functions of the individual detectors have been measured with
mono-energetic beams of electrons. Experimental results obtained with 1.6 MeV
protons on targets containing B and F show clear IPC over a wide
angular range. A comparison with GEANT simulations demonstrates that angular
correlations of pairs of transitions in the energy range between 6 and
18 MeV can be determined with sufficient resolution and efficiency to search
for deviations from IPC due to the creation and subsequent decay into
of a hypothetical short-lived neutral boson.Comment: 20 pages, 8 figure
PLASMA-DEPOSITED HYDROGENATED CHALCOGENIDE GLASSES
Hydrogenated chalcogenide glasses spanning the binary systems As-S and As-Se have been prepared by plasma decomposition of the constituent hydrides. The infrared spectra show that H is bonded predominantly to elements present in excess of stoichiometry. The reversible photo-induced shift of the absorption edge and the number and FSR spectra of photo-induced spins are the same as in glasses not containing hydrogen