Fast switching NMR system for measurements of ground-state quadrupole   moments of short-lived nuclei
  A beta-ray detecting nuclear quadrupole resonance system has been developed at NSCL/MSU to measure ground-state electric quadrupole moments of short-lived nuclei produced as fast rare isotope beams. This system enables quick and sequential application of multiple transition frequencies over a wide range. Fast switching between variable capacitors in resonance circuits ensures sufficient power delivery to the coil in the beta-ray detecting nuclear magnetic resonance technique. The fast switching technique enhances detection efficiency of resonance signals and is especially useful when the polarization and/or production rate of the nucleus of interest are small and when the nuclear spin is large. 
K. Minamisono, R.R. Weerasiri, H.L. Crawford, P.F. Mantica, K.   Matsuta, T. Minamisono, J.S. Pinter, J.B. Stoker