In particle physics, V was a generic name for heavy, unstable subatomic particles that decay into a pair of particles, thereby producing a characteristic letter V in a bubble chamber or other particle detector. Such particles were first detected in cosmic ray interactions in the atmosphere in the late 1940s  and were first produced using the Cosmotron particle accelerator at Brookhaven National Laboratory in the 1950s. Since all such particles have now been identified and given specific names, such as K meson or Sigma baryon, this term has fallen into disuse.
- G.D.Rochester, C.C.Butler (1947). Evidence for the Existence of New Unstable Elementary Particles. Nature 160, p 855.
- Pais, Abraham (1986). Inward Bound. Oxford University Press, p 21.
- Alford, W. L. (1953). The Mean Lifetime of V-Particles (Thesis). California Institute of Technology.
- Shelton, F. H. (1953). V-Particle Production (Thesis). California Institute of Technology.
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