202 ATOMIC, MOLECULAR, NUCLEAR, PARTICLE AND PLASMA PHYSICS
Nuclear PhysicsParticle PhysicsPhysicsAtmospheric PhysicsHigh Energy PhysicsTheoretical Physics
Citation at year of election
Professor McKellar's work on the borderline of nuclear and particle physics has earned him international distinction. He is a pioneer and leader in the study of the part of the nucleon-nucleon force due to the weak interaction. He has made major contributions in the application of meson theory to the study of many-body forces in nuclei, which is necessary for a fully-quantitative understanding of nuclear structure. His recent work on nucleon structure and decay promises to be very significant for particle physics and astrophysics.