A scattering chamber-cryostat for 100 MeV protons using lithium drifted germanium detectors

Abstract

A compact scattering chamber has been developed for the inelastic scattering of 100 MeV protons using Ge(Li) crystals as the total absorption proton detector. The Ge(Li) detector is mounted on a LN 2 cooled copper cold finger and is directly preceded by a “window” anticoincidence plastic scintillator and brass collimator designed to limit detected events to a central region of the detector's sensitive volume. The detector platform is externally adjustable so as to insure coplanarity of the detector's symmetry axis with the proton beam axis. The chamber also provides the usual scattering facility requirements and can be mounted directly on a 25 liter Linde dewar. An overall experimental resolution of 0.38±0.02 MeV (fwhm) has been achieved for 100 MeV protons.