= Cecil Frank Powell
{c}
{tag=Physicist}
{title2=1903–1969}
= Cecil Powell
{c}
{synonym}
= C. F. Powell
{c}
{synonym}
<Cecil Frank Powell> developed <nuclear emulsion> methods for studying <cosmic rays>. A charged particle leaves a microscopic sequence of developed grains; track length, scattering and grain density can then constrain its <energy> and <mass>. His work with colleagues on connected stopping tracks helped identify the <pion> and its decay into a <muon>. The method combined long exposures with repeated microscope measurements, turning rare cosmic events into quantitative evidence.<The Cosmic Radiation by Cecil Frank Powell>[1950 authored lecture, photographic-emulsion methods and meson studies]{ref}
A <physicist>.https://www.bristol.ac.uk/university/distinctions/[Independent professional profile: Powell biographical paragraph: appointed Melville Wills Professor of Physics in 1948; full name and life years in heading]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/c/ca/Cecil_Powell.jpg]
{title=Portrait of <Cecil Frank Powell>}
{width=240}
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