= Thomas Ypsilantis
{c}
{tag=Physicist}
{wiki}
= Thomas John Ypsilantis
{c}
{synonym}
= Tom Ypsilantis
{c}
{synonym}
= T. Ypsilantis
{c}
{synonym}
<Thomas Ypsilantis> coauthored the 1955 identification of the <antiproton>. Selecting a negative particle's <momentum> was insufficient because lighter negative particles were much more abundant. Measuring its <speed> as well supplied a <mass> test. The experiment combined magnetic selection, timed scintillation signals and velocity-sensitive <Cherenkov detectors>, connecting complementary measurements to a particle identity rather than relying on negative <electric charge> alone.<The early antiproton work by Owen Chamberlain>[1959 authored account, 1955 coauthor list and momentum/velocity discrimination]{ref}
A <physicist>.https://physicstoday.aip.org/obituaries/thomas-john-ypsilantis[Independent professional profile]{ref}
\Image[https://k1-prod-aip.s3.us-east-2.amazonaws.com/brightspot/PTO.v54.i5.80_1.f1.jpg]
{title=Portrait of <Thomas John Ypsilantis>}
{width=240}
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