Positron annihilation in a simulated low-density galactic environment

Details Positron annihilation in a simulated low-density galactic environment Positron annihilation in a simulated low-density galactic environment

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phrvl..53.2347b&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 53, Dec. 10, 1984, p. 2347-2350.

Physics

23

Interstellar Space, Positron Annihilation, Rarefied Gases, Doppler Effect, Helium, Hydrogen, Positronium, Spectral Line Width

Scientific paper

A low energy positron beam is used to study the behavior of positrons in low density (about 0.001 Torr) H2 and He. Positronium is formed in flight and the collision-free Doppler-broadened singlet annihilation linewidth in H2 is found to be 6.4 + or - 0.1 keV in agreement with the calculations of Bussard, Ramaty, and Drachman (1979). The measured fraction of positrons surviving below the positronium threshold is larger than predicted. It is concluded that the neutral interstellar environment cannot be ruled out as a galactic annihilation site.

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