title: Positronium formed by recombination of positron-electron pairs in polymers.
abstract: 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.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan. sato-k@gakugei.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: D
authors.initials: D
authors.lastname: Shanai
authors.forename: Y
authors.initials: Y
authors.lastname: Hotani
authors.forename: T
authors.initials: T
authors.lastname: Ougizawa
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: K
authors.initials: K
authors.lastname: Hirata
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi