Article View: sci.physics.cond-matter
Article #54Re: Neutrino Masses
From: Dennis Towne
Date: Thu, 19 Jul 2001 21:23
Date: Thu, 19 Jul 2001 21:23
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2453 bytes
Gordon D. Pusch wrote: > > Matt Carey <matt.carey@ieee.org> writes: [snip] > > Even if it could the huge mass difference would require a large number > > of such collisions. > > No, AFAIK, the number of collisions require to effectively thermalize > a particle is independent of its mass; IIRC, five to ten collisions > is good enough FAPP, as I believe someone posted earlier in this thread. > (Do you know of a contrary reference where it _does_ depend on the relative > masses?) Nuclear reactors. Moderating neutrons with water or some other light substance slows them down much more quickly than moderating with high Z nuclei. Also, in fusion plasma physics there is the concept of having the electron temperature different from the deuteron temperature, because the small electrons dont thermalize as quickly with the deuterons as they do with other electrons. -dennis T
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1141dc,f4dfcde22ee4c9c6 X-Google-Attributes: gid1141dc,public X-Google-Thread: 104752,f4dfcde22ee4c9c6 X-Google-Attributes: gid104752,public X-Google-Thread: 100065,f4dfcde22ee4c9c6 X-Google-Attributes: gid100065,public X-Google-Thread: 106ae0,f4dfcde22ee4c9c6 X-Google-Attributes: gid106ae0,public X-Google-ArrivalTime: 2001-07-19 15:20:06 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news.tele.dk!193.189.224.109!bignews.mediaways.net!abq.news.ans.net!news.chips.ibm.com!newsfeed.btv.ibm.com!news!not-for-mail From: Dennis Towne <sodaaaaa@xirr.com> Newsgroups: sci.physics.cond-matter,sci.materials,sci.mech.fluids,fj.sci.matter Subject: Re: Neutrino Masses Date: Thu, 19 Jul 2001 16:23:58 -0500 Organization: Dentinmud Internet Services Lines: 23 Message-ID: <3B574FEE.57C53C73@xirr.com> References: <a786eec.0107151054.5e5c867b@posting.google.com> <3B51F2D9.CEB79A8B@hate.spam.net> <3B5390E4.6056173A@ieee.org> <3B54A1A6.BE529082@grc.nasa.gov> <3B54DB55.4F633BDA@ieee.org> <m2y9pnm34i.fsf@pusch.xnet.com> <3B55C1DC.E342796E@ieee.org> <m2elrem90k.fsf@pusch.xnet.com> NNTP-Posting-Host: dentin.rchland.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: news.rchland.ibm.com 995581109 44180 9.5.66.227 (19 Jul 2001 22:18:29 GMT) X-Complaints-To: usenet@news.rchland.ibm.com NNTP-Posting-Date: 19 Jul 2001 22:18:29 GMT X-Mailer: Mozilla 3.04Gold (X11; I; Linux 2.2.14 i686)