Ps slowing down process below the Ps break-up energy in Ar gas

Yosuke Sano, Yasushi Kino, Toshitaka Oka, Tsutomu Sekine

Research output: Contribution to journalConference articlepeer-review


We performed the positron annihilation age-momentum correlation measurement to investigate the Ps slowing down process in Ar gas. We determined kinetic energies of para-positronium (p-Ps) as a function of time. The initial kinetic energy of Ps was 3.7 eV which was somewhat higher than that predicted by the conventional Ps formation model. Momentum transfer cross sections were also determined below the Ps kinetic energy of 3.7 eV, and agreed well with other experimental values near thermal energy.

Original languageEnglish
Article number052088
JournalJournal of Physics: Conference Series
Issue number5
Publication statusPublished - 2015 Sept 7
Event29th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2015 - Toledo, Spain
Duration: 2015 Jul 222015 Jul 28


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