MOMENTUM DISTRIBUTION OF e+ - e- PAIRS ANNIHILATING FREELY AND VIA PICK-OFF IN SOME ORGANIC SOLIDS

J. Chojcan1, K. Ciesielski2, T. Goworek2

1 Institute of Experimental Physics, Wroclaw University, pl. Maxa Borna 9, 50-204 Wroclaw, Poland,
2 Institute of Physics, UMCS, pl. M. Curie-Sklodowskiej 1, 20-031 Lublin, Poland

Momentum distribution of annihilating pairs e+-e- for several organic solids was measured. It is suggested that identity of distribution half-widths for free and pick-off annihilation is typical for nonpolar media.