July 28, 2017 – American Physical Society (APS) has recognized early research on cosmic rays, which was carried out between 1935 and 1960 at locations near Denver (Echo Lake and Mt. Evans). The research was done by physicists Arthur Compton, Bruno Rossi, and many others, including faculty at the University of Denver. These experiments included the first measurement of the lifetime of muons, work that confirmed the time dilation effect predicted by Albert Einstein’s theory of relativity.
A dedication ceremony and unveiling of the APS plaque at Echo Lake is scheduled for October 19, 2017. APS will be represented by the APS President-Elect Roger Falcone and the Chair of the APS Historic Sites Committee, Paul H. Halpern.
The APS Historic Sites Initiative was created by the APS Executive Board in October 2004. There are 40 designated Historic Physics Sites in the US. Previous Colorado inductees are the Aspen Center for Physics in Aspen, Colorado, and the University of Colorado Boulder for the founding of JILA.
The Department of Physics and Astronomy will organize a symposium on the early cosmic ray research at the University of Denver on October 18, 2017.