Experimental Preparation
(3 Figures)

Putting outer Dewar flasks on glass vacuum chamber containing sample of cobalt-60.

The assembly is then placed between poles of a powerful magnet for magnetic cooling to about 0.003 K. (Electronic scalers for recording radiation are in background.)

After cooling, the cobalt-60 nuclei were polarized by the magnetic field from a solenoid, here being placed around lower end of cryostat containing specimen before swinging apparatus back into center of large magnet (rear).