The triton spectrum from the reaction ${\mathrm{Li}}^6({\mathrm{He}}^3,t){\mathrm{Be}}^6$ has been measured in a 61-cm double-focusing magnetic spectrometer at ${\mathrm{He}}^3$ bombarding energies of 10, 11, and 12 MeV, and at observation angles of 1.7° and 10°. A triton group corresponding to the ${\mathrm{Be}}^6$ ground-state transition was seen. The $Q$ value for the ground-state transition is (-4.306±0.006) MeV, leading to a ${\mathrm{Be}}^6$-${\mathrm{Li}}^6$ mass difference of 4.288±0.006 MeV, in good agreement with the values from the ${\mathrm{Li}}^6\mathrm{}(p,n)\mathrm{}{\mathrm{Be}}^6$ threshold. The width of the ground state of ${\mathrm{Be}}^6$ is (89±6) keV.

• Received 11 April 1966

DOI:https://doi.org/10.1103/PhysRev.150.836