Kinetic energy of Ps formed by Ore mechanism in Ar gas

Yosuke Sano, Yasushi Kino, Toshitaka Oka, Tsutomu Sekine

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5 Citations (Scopus)


In order to investigate kinetic energy of positronium(Ps) formed by Ore mechanism, we performed positron annihilation age-momentum correlation (AMOC) measurements in Argas for 5.0 MPa and 7.5 MPa at room temperature. From the time dependence of Doppler broadening of para-Ps (p-Ps) self-annihilation gramma-ray component, we observed Ps slowing down process. Using a simple slowing down model, we obtained the initial kinetic energy of Ps formed by Ore mechanism and Ps-Armomentum transfer cross section. The initial kinetic energy was 3.9 eV which was higher than the kinetic energy of Ps formed at the upper limit of Ore gap. The momentum transfer cross section was 0.019 ± 0.010 nm2 in between 1 eV and 3.9 eV, and was close to the theoretical calculation.

Original languageEnglish
Article number012010
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2015 Jun 15
Event11th International Workshop on Positron and Positronium Chemistry, PPC 2014 - Goa, India
Duration: 2014 Nov 92014 Nov 14


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