The momentum spectrum of the alpha particles from the ${\mathrm{Be}}^9(p, \alpha ){\mathrm{Li}}^6$ reaction has been measured in a magnetic spectrometer at 30° with 10-MeV incident proton energy. The discrete alpha-particle groups observed correspond to states in ${\mathrm{Li}}^6$ at 0-, 2.19-, 3.55-, 4.40-, and 5.32-MeV excitation energy. Higher excited states are obscured at all angles of observation by the continuous alpha spectrum from the breakup in flight of ${\mathrm{Be}}^8$, ${\mathrm{Li}}^{6*}$, ${\mathrm{Be}}^{9*}$, and ${\mathrm{B}}^9$.

• Received 1 August 1963

DOI:https://doi.org/10.1103/PhysRev.132.2614