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. 

Brookhaven National Laboratory H1

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Brookhaven National Laboratory H1

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We charge a usage fee per photo if the photo is published, reproduced in a product or publicly exhibited. This is not a license in the legal sense. As a non-profit institution, we do not make any money providing these photographs. It is only by assessing usage fees that we are able to cover the cost of providing publication quality copies of our photos, preserving the photograph collection according to archival standards, and providing access to the collection by maintaining an online image database. The copyright holder may charge a fee in addition to our service fee.

Images are for use in educational projects only and must be used in a respectful manner.

Image title: 
Bubble chamber photograph of the production of the Omega Minus
Credit line: 
Photo courtesy Brookhaven National Laboratory. For Publication Permission Request contact Jane Koropsak, BNL-Media and Communications, [email protected], Tel: 631-344-4909

Bubble chamber photograph of the production of the Omega Minus: A negative K-meson enters the picture from the bottom (track #1) and collides with a proton. The collision produces the Omega Minus (track #3), a positive K-meson (track #2), and a neutral K-meson (which like other neutral particles leaves no track because it has no charge). The Omega Minus decays into a negative pi-meson (track #4), and a neutral Xi. Decay products of the Xi are a neutral lambda, and a neutral pi-meson (no track for it is indicated because it decays instantaneously). The lambda decays into a negative pi-meson (track #5) and a proton (track #6). The neutral pi-meson decays instantaneously into two gamma rays which convert into electron-positron pairs (positrons are positively-charged electrons -- the electron's antimatter counterpart).

Photo date: 
circa 1964
Original format: 
3 photographic prints (black and white; 10 x 8 inches, 10 x 6.5 inches and 7 x 5 inches)
Brookhaven National Laboratory