Spin, Hyperfine Structure, and Nuclear Magnetic Dipole Moment ofO15

Abstract

The nuclear spin and hfs splitting of ${\mathrm{O}}^{15}({\tau }_{\frac{1}{2}}=124\mathrm{} sec)$ in the ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}$ atomic ground state have been determined by the atomic beam magnetic resonance method. ${\mathrm{O}}^{15}$ was produced in the reaction ${\mathrm{N}}^{14}(d, n){\mathrm{O}}^{15}$ by allowing a 5-MeV deuteron beam from the Columbia Van de Graaff accelerator to impinge upon a gaseous ${\mathrm{N}}_2$ target. The radioactive gas flowed continuously from the target chamber into the microwave discharge source of the atomic beam apparatus. A rotating-wheel deposition detector specially suited for shoft-lived radioactive atoms was used to detect the beam. The spin is found to be ½, in agreement with the shell-model prediction. The hfs splitting of ${\mathrm{O}}^{15}$ in the ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}$ state is observed to be 1037.23±0.07 Mc/sec, and the nuclear magnetic dipole moment of ${\mathrm{O}}^{15}$ is deduced to be 0.7189±0.0008 nm.