The University of Michigan Fridman et al.) ) and the University of Strasbciurg H.B.C. Their groups have expressed a desire to collaborate with us in the study of L~P interactions in the 15 foot name& should be added to the proposal

Instead of the pulsed dipole it might be more useful to consider a superconducting dipole of length 1 metre, should this be available. The pulsed quadrupole magnets and associated power supply already at could be used for our exposures. •

For technical reasons it makes sense to do the exposure at 250 GeV/c first. This would require 300 GeV/c protons which can be transported in adequate numbers and focussed down to a small spot J.G. Rushbrooke decay losses will be lower and shielding from background will be relatively easier at the higher momentum. Since ~- will enter the chamber along with the L- the fact that an. exposure to ~ at 250 GeV/c (Experiment 1= 234) has already been made will permit a useful comparison and/or correction to be made 16 July 1975