Abstract
The positron-annihilation spectra and decay rate in neon gas have been simulated via the Boltzmann time-dependent equation in the presence of electric and magnetic fields at room temperature using the positron-atom interaction model of McEachran, Ryman, and Stauffer (J. Phys. B 3, 551 (1978)). The electric and magnetic fields are varied over the ranges 0--10 VX/sup -1/ and 0--10 kG, respectively. Equilibrium is reached at about 18X0 ns after the initial introduction of a positron swarm when there are no electric and magnetic fields present. The equilibrium value of the annihilation decay rate is 6.97 at zero electric and magnetic fields. The time for attaining equilibrium decreases with the increase in electric field. Its values are 6000, 3600, and 2400 ns for E = 2, 5, and 10 V cm/sup -1/, respectively. The effect of magnetic field is to delay the approach to the equilibrium of the positron distribution.
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