We have extrapolated regeneration data obtained at other accelerators into our energy range in order to estimate the event-rates to be expected. The acceptance, for events within the first t~170 lifetimes has been calculated by Honte Carlo and is shown in Figure 2. Our measured KL spectrum (at 400 Gev/c) is shown in Figure 3. The folding of the spectrum, the acceptance, and the extrapolated (and interpolated) regeneration power yields the following: 7. Element 10 12 Protons* Events / day*'~ Al 3.8 65K eu 2.9 50K Sn 2.4 4lK Pb 2.0 34K + ­detected K -+ 1T 1T decays within f1.rst two lifetimes behind s a regenerator of two interaction lengths. 12 **Day 20 hrs, 10.5 sec rep rate, 2.5 x 10 protons/pulse, 400 Gev/c protons. \.Je plan on collecting SOK events for each regenerator: this will provide better than 1% measurements of If ~ f I in several momentum bins. The relevant exponent in the A£ dependence will also be obtained at the 1% level 1.n several bins. In addition, we shall run for about 1 day \vith each target to measure