Abstract
An experimental arrangement for the study of thermal neutron capture gammas from reactions with low cross sections or where use is made of small amounts of separated isotopes is described. In this arrangement a through evacuated reactor channel and Ge(Li)-spectrometers for gamma detection are used. For the measurement of capture gammas above the pair production threshold a three crystal pair spectrometer employing a Ge(Li)-crystal surrounded by a bisected NaI-annulus is used. For the measurement of the low energy part of (n, γ)-spectra the same annulus is used in the anticoincidence mode. The efficiency of the anticoincidence mantle for detecting backscattered quanta from the Ge(Li)-crystal is increased by adding a 5″ dia. × 4″ long NaI-crystal with a through axial hole to the anticoincidence assembly. The functioning of the spectrometers is illustrated with capture gammas from the A(n, γ)- and Fe(n, γ)-reactions. The efficiency of the spectrometers and the background conditions are discussed and related to the minimum target quantities required.
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