In reply to Bob Cook's message of Tue, 25 Mar 2014 10:49:12 -0700: Hi Bob,
When a fast electron interacts with other electrons it does so through a repulsive force, and imparts energy to them through collisions, knocking them away from their host atoms, and leaving them with some kinetic energy. A positron should also tear electrons away from their host atoms and leave them with excess kinetic energy. The only difference being that the force will be a mixture of attractive (and repulsive?) forces. Attractive at a distance (and repulsive in a head on collision ?). A near miss would be attractive forces and a "whip around" (conservation of angular momentum). Perhaps a head on collision results in annihilation? AFAIK stands for "As Far As I Know". >Robin-- > >The positron leaves the Ni-59 nucleus after an electron capture with about 1 >Mev of energy--the disintegration energy is a little more than 1 Mev. >However, I have not seen a cross section for the reaction we are talking >about. I would agree, if the positron acts like an electron in a >population of electrons, that it would slow down, but being a positive >charge I not sure how that effects the slowing down. (I think you suggest >its positive charge does not change the slowing down process?) The fact that >the >resulting photons total energy equal 2 x the electron mass probably means >there is no excess energy and momentum that needs to be handled in the >reaction. I am not sure whether neutrinos in the annihilation reaction have >been ruled out by experiment. Probably ruled out only by theory. > >By the way what does AFAIK stand for? > >Bob >----- Original Message ----- >From: <[email protected]> >To: <[email protected]> >Sent: Monday, March 24, 2014 1:32 PM >Subject: Re: [Vo]:My current views on the 'Rossi's process' > > >In reply to Bob Cook's message of Sun, 23 Mar 2014 15:19:14 -0700: >Hi, >[snip] >>Your description is exactly as I understand it. The random walk is not >>very long however, since it probably occurs at the first electron it >>attracts and that is pretty quick after the nucleus gives it up. > >AFAIK annihilation usually only happens after the positron has slowed down. > >Regards, > >Robin van Spaandonk > >http://rvanspaa.freehostia.com/project.html > Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
