Measurement of Branching Ratio of Deuteron Induced Reactions on ²H at 20keV

The γ-rays and protons from E_d=20keV deuterons incident on a D--Ti target are measured. The branching ratio of the ²H (d,γ)⁴He reaction to the ²H (d,p)³H reaction is obtained to be Γ_γ/Γ_p=(1.06±0.42)×10^-7, and the astrophysical S factor of the ²He(d,γ)⁴He reaction is deduced to be (5.7±2.4)×10^-6.