two and four prong interactions at 205 GeV/c, to be published. 3 M.B. Einhorn et aI., Phys. Rev. Lett.~, 1627 (1972) and 30,34 (1973). 4. H. 'fye and G. Veneziano, CERN pre-print TH l552-CERN (1972) and G. 'Veneziano, private communication. See review article by M. Jacob, NAL-73/l4/THY. 5. See for example review article by ' Sinc~ for large recoiiing masses M and large S/M2 the expected cross-section ex (0) -~ (t). (near

lIigh Energy Collisions, Stony Brook Conference 1969, p. 237 Lett. E, Cornell pre-print CLNS-13l (1970). 12. Sec for example II.C. lIs1ung et u1., Phys. Rev

187 (1968) ct a

NAL PROPOSAL No. 204 Supplement 2 March, 1973 Proposal for a pd 200 GeV/c Be Experiment at NAL (Weizmann Institute High Energy Group) Identification of coherent d events from recoil particle measurements. In standard bubble-chamber experiments at a few GeV/c the identification of coherent d-events is usually achieved via complete kinematical solutions of individual events (4c or lc solutions). Thus in true d-events, for example, pd + pdw+w-, the spurious (lc) solution ppsnw+w- usually yields a very narrow d spike in the invariant mass distribution M(ps+n). At NAL energies complete kinematical solutions are almost impossible and one has to utilize the measure­ ments of the slow particle alone in order t·o isolate the coherent d-events. We wish to demonstrate that by such measurements one can unambigous1y identify deuterons in the momentum region of 0.4 - 3.0 GeV/c d = 0.8 - 3.0 GeV/c. In this region deuterons will have specific ionization less than 6 time minimum ionization and will not stop in the 30" bubble chamber. However, ionization measurements can easily be carried out here and since for the same ionization the d-momenta will be twice the corresponding proton momentum, the particle identification is easy and possible. Note that p ~.8 GeV corresponds to Itl~ 0.6 GeV2 and thus only very few events are expected in this energy region