Abstract
A value of (- 0.8 \ifmmode\pm\else\textpm\fi{} 2.5) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}5}$ has been measured for the ratio of double-photon to single-photon emission following neutron capture in hydrogen for $600 \mathrm{keV}<{E}_{\ensuremath{\gamma}}<1620 \mathrm{keV}$. The two Ge(Li) detectors used in the experiment subtended an angle of 85\ifmmode^\circ\else\textdegree\fi{} at the ${\mathrm{H}}_{2}$O target and were shielded from each other to reduce the background from the cross registration of single $\ensuremath{\gamma}$ rays. The upper limit of the measured two-photon cross section (-3 \ifmmode\pm\else\textpm\fi{} 8 \ensuremath{\mu}b) is two orders of magnitude larger than the most recent theoretical predictions ($\ensuremath{\approx}0.07$ \ensuremath{\mu}b) for this energy range.NUCLEAR REACTIONS $^{3}\mathrm{H}(n,\ensuremath{\gamma}\ensuremath{\gamma})$, thermal $n$, measured ${\ensuremath{\sigma}}_{2\ensuremath{\gamma}}$ Ge(Li) detectors.
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