Measurements Of Radiative Capture Cross Sections At Big Bang Energies

We measured d(p,gamma)He-3 cross sections at E-CM = 0.12, 0.19, 0.44 and 0.57 MeV. In this energy region, available experimental values are systematically smaller than the recent calculation, so that additional experiments are desired for understanding the Big Bang Nucleosynthesis. The experiment was performed by bombarding proton beams to the D-2 gas target with the 5 MV Van de Graaff accelerator at Osaka University. The experimental d(p,gamma)He-3 cross sections of the present study are systematically larger than previous data. On the other hand, recent theoretical results by Marcucci et al. are in good agreement with present experimental results.