Abstract
The $^{2}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{p}, \ensuremath{\gamma})^{3}\mathrm{He}$ reaction has been studied in the energy region ${E}_{p}=80\ensuremath{-}0$ keV (${E}_{\mathrm{c}.\mathrm{m}.}=53.3\ensuremath{-}0$ keV), where the quantities measured were $\ensuremath{\sigma}(\ensuremath{\theta}, E)$ and ${A}_{y}(\ensuremath{\theta}, E)$. Our result for the total $^{2}\mathrm{H}(p, \ensuremath{\gamma})^{3}\mathrm{He}$ $S$ factor at $E=0$ is $S(0)=0.121\ifmmode\pm\else\textpm\fi{}0.012$ eV b (including systematic error), which is 52% lower than the presently accepted value. Some astrophysical aspects of this result are discussed. We have also extracted the $E1$ and $M1$ $S(E)$ components using our detailed angular distribution data. These data will provide sensitive tests for three-body calculations which include Coulomb and meson exchange current effects.
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