EXPERIMENTS AND POSSIBILITIES WITH SUPERINTENSE MOSSBAUER SOURCES

We have been able to prepare Mossbauer sources having intensities rang ing from 10 to 100 Ci for several isotopes, using the Missouri Univers ity Research Reactor Facility, MURR. These sources offer rich opportun ities for carrying out precision Mossbauer experiments as well as high collimation scattering experiments. Using such intense sources, we ha ve been able to measure the interference parameter of the 46.5 keV Mos sbauer transition to about 1% accuracy. We find it to be about 10% gre ater than predicted by theory, which may have significant implications for time reversal violation experiments. We have also been able to sh ow that the Bragg scattered recoilless fraction scattered from (200) p lanes of sodium chloride crystals is 94% of that found for the (600) r eflection, even though the integrated intensity of this reflection is more than a factor of 10 less than that of the (200) reflection. We hi ghlight some of the experiments that we have carried out and discuss s ome of the enticing possibilities for the future with sources in the 1 0-1000 Ci range. One of these is the possibility of doing Mossbauer sp ectroscopy with a stationary source and absorber, moving only a monoch romating crystal filter along the direction of the reciprocal lattice vector associated with the Bragg reflection being used.