R. B. Firestone

An improved and modular helium-jet recoil-transport system for the study of short-lived nuclei

Abstract An improved, modular helium-jet-recoil-transport system for the study of short-lived (t 1 2 ⪅ 0.2 s ) is described. Its target irradiation assembly consists of modular pieces, allowing the interchanging of different target holders, different recoil-thermalizing chambers, etc., for economical and convenient setting up of each experiment. A remote-control degrader package allows rapid control of accelerator beam energies. Improved target-preparation techniques are described, including compacting oxides onto foils with a hydraulic press. Auxilliary equipment such as gas supplies, capillaries, pumping equipment, and a stepping tape drive for the counting chamber are described. Different detector arrays and assemblies are used for different kinds of nuclear spectroscopy, and data are presented for some of these, including γ-ray, γ-γ megachannel (multiparameter) coincidence, and β-delayed proton spectroscopy.

Fast calibration of large Si(Li) electron detectors from 511.0 to 4564.0 keV using double-escape peaks and compton edges from 66Ga

Abstract Double-escape peaks and Compton edges from the γ-rays of 9.5-h 66 Ga have been used to allow fast, precise calibration of Si(Li) electron detectors. They allow a direct calibration up to 4564.0 keV, and the calibration curve is linear enough that it can probably be extrapolated safely to even higher energies.