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

29th International Conference on Photonic, Electronic, and Atomic Collisions

Sano, Yosuke^1 ; Kino, Yasushi^1 ; Oka, Toshitaka^1,2 ; Sekine, Tsutomu^2

Department of Chemistry, Tohoku University, Sendai

980-8578, Japan^1

Institute for Excellence in Higher Education, Tohoku University, Sendai

980-8576, Japan^2

关键词: Age-momentum correlation;    Experimental values;    Function of time;    Initial kinetics;    Momentum transfer cross sections;    Ps formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052088/pdf
DOI  :  10.1088/1742-6596/635/5/052088

来源: IOP

【 摘 要 】

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.