Positron annihilation profiles for HPs and He(S-3(e))e(+)

A theory of positron annihilation for exotic atoms is presented. An express ion for the 2 gamma annihilation rate for transitions to individual residua l atom (or ion) states recoiling at a given recoil momentum is given. Addit ional expressions are presented for the annihilation rate integrated over r ecoil momenta or summed over all possible final atom states. These results are used to calculate the annihilation profiles for HPs and He(S-3(e))e(+) and it is seen that the branching ratios to the population of the 1s ground states are 0.9777 and 0.9996, respectively.