Angular distribution of the 3H(p,γ)4He reaction at proton energies below 1 MeV

The differential cross section of the 3H(p,γ)4He reaction has been measured at the proton energies E sub(p) = 0.46, 0.50, 0.62, 0.77, and 0.93 MeV. A thin 3H-Ti target has been used and the γ-rays have been detected by a 12.7 cm diameter x 15.2 cm long NaI(Tl) crystal rotating over the angular range theta sub(L) = 0 to 1350. The 3He reaction is found to proceed through E1, M1, and E2 transitions, E1 transitions being predominant. The ratio of the γ-ray flux at theta sub(L) = 0 and 900 is energy dependent and decreases from 0.017 +- 0.003 at E sub(p) = 0.46 MeV to 0.0078 +- 0.006 at E sub(p) = 0.93 MeV. (auth)