https://doi.org/10.1140/epjd/e2016-60730-8
Regular Article
Formation of H̅ in p̅-Ps collisions embedded in plasmas*
1 Institute of Mathematical Sciences,
Faculty of Science, University of Malaya, 50603
Kuala Lumpur,
Malaysia
2 Department of Mathematics, Kazi
Nazrul University, Nazrul Road,
Asansol, 713340
West Bengal,
India
3 Department of Mathematics, Burdwan
University, Golapbag,
713104
Burdwan, West Bengal,
India
4 Centre for Foundation Studies in
Science, University of Malaya, 50603
Kuala Lumpur,
Malaysia
a e-mail: kuru052001@gmail.com
Received:
28
December
2015
Received in final form:
18
February
2016
Published online:
12
April
2016
Screening effects of plasmas on the formation of antihydrogen (H̅) in an arbitrary s-state from the ground state of the positronium atom (Ps) by antiproton (p̅) impact have been studied within the framework of charge-conjugation and time-reversal invariance. Two types of plasma environments have been considered, namely weakly coupled plasma and dense quantum plasma. For weakly coupled plasma, the interactions among the charged particles in plasma have been represented by Debye-Huckel screening model, whereas for dense quantum plasma, interactions among the charged particles in plasma have been represented by exponential cosine-screened Coulomb potentials. Effects of plasma screening on the antihydrogen formation cross section have been studied in the energy range 15–400 keV of incident antiproton. For the free atomic case, our results agree well with some of the most accurate results available in the literature.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2016