The reaction ${\mathrm{Al}}^{27}(\alpha , n){\mathrm{P}}^{30}$ has been studied at 8.15-Mev bombarding energy using nuclear emulsions as detectors. Neutron groups corresponding to $Q$ values of -2.70, -2.96, -3.59, -4.43, and -4.96 Mev were observed. Comparison of the resulting energy level structure in ${\mathrm{P}}^{30}$ with that obtained by other reactions suggests the possible inversion of the two isobaric spin ground states.

• Received 13 August 1959

DOI:https://doi.org/10.1103/PhysRev.117.535