An NaI(Tl) spectrometer system has been installed to measure the cross sect
ion of a radiative neutron-capture reaction of a nucleus at an astrophysica
lly relevant energy of between 10 and 500 keV. The system consists of two l
arge anti-Compton NaI(Tl) spectrometers and a new data-taking system. The s
pectrometer can detect a discrete gamma-ray emitted promptly from a neutron
-capture state to its low-lying slate, and the data-taking system can trans
fer events with much higher rates, about 30-times higher, compared to the e
xisting system. (C) 1999 Elsevier Science B.V, All rights reserved.