a function of incident proton energy. Any threshold effect might signal the production of the intermediate boson followed by leptonic decay P-West spectrometer is currently being installed in the labora­ tory. The entire system including detectors, cabling, electronics, and computer should be ready to begin testing by late spring or early summer. At that time it is hoped that modifications to the proton beam line will have been completed. Data taking should be able to begin later in the summer of 1974. 200 150 u....... >/l) r.o 1000> <II '0 o.D \:) 50 o '-__.l-_ _ _L.__-.i_ _ _ _ _--l'--_ _~ o