Violation of the Isotopic Spin Selection Rule in theCa40(d, α)K38Reaction

Alpha particles leading to the ground state and first excited state of ${\mathrm{K}}^{38}$ in the ${\mathrm{Ca}}^{40}(d, \alpha )$ reaction have been observed and the excitation energy of the first excited state of ${\mathrm{K}}^{38}$ has been determined as 123±8 kev. The relative intensities of the groups has been measured for incident deuteron energies between 3.2 and 4.1 Mev. Over this range the average intensity of the ground-state group is about 10 times that of the group to the first excited state and it is concluded that the latter is the $0^{+}$ $T=1\mathrm{}$ analog of the ${\mathrm{A}}^{38}$ ground state.