= Dale D. Hoppes
{c}
{tag=Physicist}
= D. D. Hoppes
{c}
{synonym}
= Dale Hoppes
{c}
{synonym}
An experimental <nuclear physicist> who coauthored the <Wu experiment>. Comparing <beta decay> from oriented <cobalt-60> nuclei with the opposite orientation tested whether a mirror-reflected process would have the same probability. The observed directional asymmetry showed failure of <parity conservation> in the <weak interaction>.<Experimental Test of Parity Conservation in Beta Decay by Chien-Shiung Wu and others>[Byline and cobalt-60 beta asymmetry]{ref}
\Image[https://www.nist.gov/sites/default/files/styles/220_x_220_limit/public/images/2016/09/26/ihoppes.gif?itok=ZkXBGAsJ]
{title=Portrait of <Dale D. Hoppes>}
{description=External portrait linked by the National Institute of Standards and Technology institutional exhibit.}
{source=https://www.nist.gov/pml/fall-parity/fall-parity-photo-gallery-short-biographies}
{width=220}
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