The high-energy part of the alpha spectrum emitted in the bombardment of ${\mathrm{Li}}^7$ with deuterons, was measured with a magnetic spectrometer at $E_d=1.0\mathrm{}$ Mev and $\theta =90\mathrm{}°$. For the ${\mathrm{Li}}^7(d, \alpha ){\mathrm{He}}^5$ (ground state) reaction, a $Q$ value of 14.11±0.08 Mev is obtained. The spectrum yields level parameters for the ground state of ${\mathrm{He}}^5$ which are consistent with those known from $n-\alpha$ scattering data. No definite evidence for an $\alpha$ group corresponding to an excited state of ${\mathrm{He}}^5$ was found.

• Received 30 December 1957

DOI:https://doi.org/10.1103/PhysRev.110.529