Overview

Burton Richter (March 22, 1931 – July 18, 2018) was an American experimental physicist best known for co-discovering the J/ψ meson in 1974 and for his long association with the Stanford Linear Accelerator Center (SLAC). The J/ψ discovery helped trigger a rapid transformation in particle physics often called the "November Revolution," and Richter's work earned him a share of the 1976 Nobel Prize in Physics.

Scientific contributions

Richter led a team that identified a previously unseen narrow resonance in high-energy electron–positron collisions. That resonance, labeled J/ψ, was quickly interpreted as a bound state of a new type of quark and its antiquark, a result that fit into and strengthened the emerging quark model. The experimental techniques developed by Richter and his collaborators—precision control of beams, careful detector design, and detailed data analysis—became standards in collider-based particle physics.

Career and leadership

Richter spent much of his career at SLAC, first as a leading experimentalist and later as director. As SLAC director from 1984 to 1999 he oversaw the laboratory's scientific programs, infrastructure, and large-scale experiments. During his tenure SLAC continued to be a major center for accelerator-based research and technology, supporting experiments that probed the structure of matter and tested theories of fundamental particles and forces. He was widely regarded as a mentor to younger scientists and a practical leader in coordinating complex, multi-institution projects.

Impact and legacy

The discovery of the J/ψ meson is widely cited as a turning point because it provided clear experimental support for the existence of a fourth type of quark (charm) and prompted a rapid consolidation of the quark model and quantum chromodynamics. Richter's Nobel accolade recognized both the specific discovery and its broader influence on the direction of high-energy physics. Beyond his research, he contributed to discussions on the role of large facilities in science and to the training of subsequent generations of physicists.

  • Key discovery: Co-discovery of the J/ψ meson (1974), central to the November Revolution in particle physics.
  • Award: Shared the 1976 Nobel Prize in Physics for the J/ψ discovery (Nobel citation).
  • Leadership: Director of SLAC from 1984 to 1999, guiding major research programs and facility operations.
  • Death: Died July 18, 2018, in Palo Alto, California; see obituary for announcements and remembrances.

Richter is remembered both for a singular experimental achievement that reshaped particle physics and for decades of stewardship of accelerator-based science. His career illustrates how careful instrumentation, persistent experimentation, and institutional leadership combine to advance fundamental knowledge.