In 1969, the Stanford Linear Accelerator Center (SLAC) electron-positron colliding accelerator was built to investigate particles within the proton and neutron. Physicists were able to detect the quark structure of the proton and, in 1974, Lawrence Berkeley Laboratory (LBL)-SLAC physicists discovered the J/psi particle at SLAC's SPEAR (Stanford Positron Electron Accelerator Ring). In 1976, they identified other charmed particles in K pion experiments. Associate Directors of LBL Physics Division (1971-1981): William A. Wenzel (1971-1972, Physics I) and Edward J. Lofgren (Physics II); Robert W. Birge (1973-1981). (From 1976 to 1983, the Physics Division was known as Physics Computer Science, and Mathematics Division).
From the description of Physics Research and Development Administrative Files, 1953-1982 (bulk 1970-1978). (American Institute of Physics). WorldCat record id: 79215091
