First polarization results from the LAMPF 13C target

A polarized 13C target has been developed and used to measure spin observables for 500‐MeV p‐13C elastic scattering. The material was ethylene glycol, 13C2H6O2, enriched to 99% in 13C. Both the 13C and 1H spins were dynamically polarized in a 3He refrigerator at 2.5‐T magnetic field. The polarization of both species was measured by using the NMR thermal equilibrium calibration technique. In addition, the polarization of 1H was independently measured by p‐p scattering. We describe the target and report on the polarizations obtained and the dependence of the polarizations on integrated beam intensity.