Sorry I wrote about the same issue before I read this latest response. :-) In either case, it is somewhat evident that the concept of a ULM neutron would only make sense at near absolute zero temperatures of the surrounding and target atoms. This should force us to accept a value of cross section that is smaller than we were originally considering. More neutrons should escape as the metal gets hotter.
Dave -----Original Message----- From: Eric Walker <[email protected]> To: vortex-l <[email protected]> Sent: Tue, Mar 26, 2013 10:09 pm Subject: Re: [Vo]: Low Energy Neutrons and Local Temperature I wrote: Take a (hypothetical) near-stationary neutron and an energetic nickel lattice atom. I believe their interaction is characterized by the center-of-mass system that takes them both into account -- if the nickel atom is moving quickly towards the neutron, according to the center-of-mass system they are moving towards one another at equal velocities. Not equal, but in this system the neutron is no longer stationary either (actually, I think it might be the neutron that is moving quickly). Needless to say, I suspect there would be occasional reflection. Eric
