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. 

Bromley David Allan H1

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Bromley David Allan H1

David Allan Bromley
Image title: 
First Precision Heavy Ion Science Data
Credit line: 
AIP Emilio Segrè Visual Archives, Bromley Collection

Caption courtesy D. Allan Bromley: "A demonstration of the high-precision possible with a gold silicon semiconductor junction detector. This was the spectrum obtained by bombarding a carbon target with a beam of carbon ions showing the elastic scattering from carbon as well as from the silicon and oxygen contaminants in the carbon film target. This particularly [sic] spectrum is unique, as indicated, because it was taken with the world's first tandem accelerator, with the world's first silicon semiconductor nuclear detector, and with the world's first transistorized mult-channel analyzer -- [at Chalk River Nuclear Laboratories] in late 1959."

Photo date: 
Original format: 
1 photographic print (black and white; 8 x 10 inches)
Bromley, D. Allan (David Allan), 1926-2005