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I am studying this paper by Gleeson and Axford from 1968. They often measure the energy of a particle in BeV: does it mean GeV, like a Billion of eV?

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    $\begingroup$ Yes, that is an old way to say $10^9$ eV. It's what gave the Bevatron its name. $\endgroup$ – J. Murray Mar 2 '18 at 17:19
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B is the prefix beva. It's an older prefix, but it checks out. It is equivalent to the SI prefix giga, $10^9$

http://m.wolframalpha.com/input/?i=beva&lk=1

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