From: utzoo!decvax!decwrl!sun!megatest!fortune!hpda!hplabs!sri-unix!JGA@MIT-MC
Newsgroups: net.physics
Title: Re: Any nuke designers out there?
Article-I.D.: sri-arpa.832
Posted: Tue Apr  5 06:29:00 1983
Received: Thu Apr  7 01:30:14 1983

From:  John G. Aspinall <JGA @ MIT-MC>

    Date: 4 Apr 83 17:20:56-PST (Mon)
    From: faustus (Wayne Christopher) at Ucb-Vax
    Article-I.D.: ucbvax.203
    In-Reply-To: Article sdccsu3.456
    Received: from Usenet.uucp by SRI-Unix.uucp with rs232; 5 Apr 83 2:51-PST

    I'm no nuke designer, but as I understand it...

 I'm no nuke designer either, but the fast fission cross
sections of U-235 and Pu-239 are similar enough.  In BOTH cases, the
super-critical mass has to be assembled pretty fast.