In the early 1960s Steinberger, along with his Columbia University
colleagues Lederman and Schwartz, devised a landmark experiment in particle
physics using the accelerator at the Brookhaven National Laboratory,
N.Y. The three reseachers obtained the first laboratory-made stream
of neutrinos--subatomic particles that have no electric charge and virtually
no mass. In the process, they discovered a new type of neutrino called
a muon neutrino. The high-energy neutrino beams that the three researchers
produced became a basic research tool in the study of subatomic particles
and nuclear forces. In particular, the use of such beams made possible
the study of radioactive-decay processes involving the weak nuclear
force, or weak interaction, one of the four fundamental forces in nature.
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