Multiple-Gap Magnetic Spectrograph for Charged-Particle Studies

Abstract

A spectrograph has been designed that simultaneously records broad-range, charged-particle spectra at twenty-four different reaction angles, 7.5° apart, from 0 to 172.5°. At each angle, the spectrograph records a spectrum with a total energy range of about 2.3:1 and with a resolving power exceeding R=E/ΔE=1000, where ΔE is the full width at half-maximum of a peak. The recorders are seventy-two 2×10 in. nuclear-track plates, which are developed and scanned under a microscope after the exposures. When half-millimeter strips across the nuclear-track plates are scanned, the information contained on the nuclear-track plates after one exposure corresponds to about 36 000 data points. A typical exposure time with about a 0.5-μA beam is of the order of 2 to 3 h.