In reply to  Jones Beene's message of Fri, 13 May 2011 18:05:59 -0700:
Hi,
[snip]
>-----Original Message-----
>From: mix...@bigpond.com 
>
>> One can see that the cross section for neutron absorption by Ni62 at
>thermal energies (~ 2E-8 MeV) is about 14 barn.
> 
>
>Yes of course - that is a thermal neutron - which changes everything. There
>is no thermalization mechanism in this reactor so these are out of the
>question - and as stated, nickel is largely transparent to neutrons from
>nuclear reactions unless thermalized.
>
>
The "thermalization mechanism" is the next atom in the lattice. They all
vibrate, and it's neigh on impossible to prevent an "ultra-cold" neutron from
becoming thermalized in about a microsecond.
Regards,

Robin van Spaandonk

http://rvanspaa.freehostia.com/project.html

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