The annihilation of positrons in the cold phase of the interstellar medium revisited

Details The annihilation of positrons in the cold phase of the interstellar medium revisited The annihilation of positrons in the cold phase of the interstellar medium revisited

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..610w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 2, p. 610-615

Astronomy and Astrophysics

Astrophysics

15

Abundance, Cold Gas, Elementary Particles, Interstellar Matter, Ionization Cross Sections, Molecular Clouds, Nuclear Fusion, Positron Annihilation, Astronomical Models, Charge Exchange, Computerized Simulation, Hydrogen, Mathematical Models, Monte Carlo Method, Positronium

Scientific paper

The positron cross sections in H and H2 media are reevaluated, taking into account new experimental results. Using a Monte Carlo simulation, we find a positronium fraction before thermalization of 0.90 for H2, in good agreement with the previous experimental result given by Brown et al. (1986). For H we obtain an upper limit of 0.98. We study the behavior of the charge exchange annihilation in a cold phase (molecular cloud). We calculate a formula for the slowing-down time t, before annihilation lasting Delta t, via charge exchange, of a positron beam with a given energy for different medium densities and initial energies. An upper limit of 0.7 MeV for the initial energy of the positrons, annihilating in the molecular cloud G0.86 - 0.08 near the gamma ray source positronium and gives new time constraints on their possible observation.

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