The $^{3}{\rm H}(d,\gamma)$ Reaction at $E_{\rm c.m.}\leq300$~keV

The $^{3}{\rm H}(d,\gamma)^{5}{\rm He}$ reaction has been measured using a 500-keV pulsed deuteron beam incident on a stopping titanium tritide target at the Edwards Accelerator Laboratory. The time-of-flight technique has been used to distinguish the $\gamma$-rays from neutrons in the bismuth germinate (BGO) $\gamma$-ray detector. A stilbene scintillator and an NE-213 scintillator have been used to detect the neutrons from the $^{3}{\rm H}(d,n)\alpha$ reaction using both the pulse-shape discrimination and time-of-flight techniques. A newly designed target holder with a silicon surface barrier detector to simultaneously measure $\alpha$-particles to normalize the number of neutrons, along with a new titanium tritide target, was incorporated for subsequent measurements. The $\gamma$-rays have been measured at laboratory angles of 0~$^{\circ}$, 45~$^{\circ}$, 90~$^{\circ}$, and 135~$^{\circ}$. Information about the $\gamma$-ray energy distribution for the unbound ground state and first excited state of $^{5}{\rm He}$ can be obtained experimentally by comparing the BGO data to Monte Carlo simulations. The $^{3}{\rm H}(d,\gamma)$/$^{3}{\rm H}(d,n)$ branching ratio has also been measured. Data analysis is currently underway for the subsequent measurements.