Positronium formed by recombination of positron-electron pairs in polymers.
In nonpolar polymers, positronium (Ps) is dominantly formed by fast intraspur reactions of the energetic positron, but its formation is partially contributed by recombination of weakly bound Mott-Wannier-like positron-electron pairs and is susceptible to electric field and positron irradiation induced perturbations. The average initial energy of para-Ps (p-Ps) formed by recombination is found to be about half the energy of ordinary p-Ps dominantly formed by the fast intraspur reactions.
Sato
K
K
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan. sato-k@gakugei.ac.jp
Shanai
D
D
Hotani
Y
Y
Ougizawa
T
T
Ito
K
K
Hirata
K
K
Kobayashi
Y
Y