Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Attention ESVA Patrons:

The Emilio Segrè Visual Archives’ site is moving soon and adopting an open access approach to digital image sharing. Once we have transitioned to the new site in 2021, we will no longer charge for our high-resolution digital images or usage fees (note that we do not hold copyright to all the images in our collections and you will still need to obtain permission for those which we do not own).

If you are working on a long-term project, we advise you to wait until the migration is complete so that you may obtain our copies for free. If you cannot wait, email us at nbl [at] aip.org and we will do what we can to assist you. We will not be offering refunds for past purchases.

For more information, please visit our FAQ page on the Ex Libris Universum blog. 

Clayton Donald B20

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Clayton Donald B20

Donald D. Clayton
Image title: 
Clayton Lectures at Rice University
Credit line: 
AIP Emilio Segrè Visual Archives, Clayton Collection.

Clayton in Rice office; Donald Clayton explaining the emergence of 847 keV gamma rays from 56Co decay in supernova 1987A. His News and Views account one month earlier in Nature 330, 423 (1987) predicted that the gamma ray lines were about to emerge on the basis of first detection of the Compton-scattered gammas. Clayton had predicted the 847-keV line in 1969 (with Colgate and Fishman; ApJ 155, 75 (1969)).

Photo date: 
January 1988
Original format: 
1 photographic print (black and white; 9 x 6 inches)
Clayton, Donald D.