NUCLEAR AND NUCLEAR ASTROPHYSICAL INTEREST IN D(N, GAMMA)H-3 REACTION

A neutron capture cross section of deuterium was measured for the firs t time at the neutron energies between 10 and 80 keV by detecting the prompt gamma-ray from the capture state to the ground state of triton. The cross section is important to study the nuclear dynamics of the f ew nucleon systems, and to estimate the elemental abundances in the pr imordial nucleosynthesis. In order to pick up the small gamma-ray sign al from huge background we have developed highly sensitive NaI(T1) det ector systems with good signal to noise ratio. Use of these detectors together with pulsed neutron beams enabled us to determine the small c apture cross section accurately. The cross sections were obtained as 2 .12 (35) and 2.04 (3) mu barns at 30.5 and 54.2 keV, respectively, and they are compared with the theoretical ones.