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
