Beta-NMR Apparatus

We have developed a beta-NMR system at the NSCL for the measurement of ground state moments of nuclei far from stability. The system currently resides between the pole faces of a small dipole magnet located in the S1 vault. 

The detectors consist of two beta telescopes surrounding a thin catcher foil. The telescopes are located at 0- and 180-degrees relative to the direction of the holding field of the dipole magnet, and are each placed 9 mm from the catcher foil. 

A set of radiofrequency coils are also located around the catcher foil, which provide the oscillating magnetic field for the resonance measurement. The RF coils are two 30-turn loops of 28 AWG magnet wire arranged in a Helmholtz-like geometry.