# ANTICOOL: simulating positron cooling and annihilation in atomic gases

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## Abstract

The Fortran program {\tt ANTICOOL}, developed to simulate positron cooling and annihilation in atomic gases below the positronium-formation threshold, is presented. Given positron-atom elastic scattering phase shifts, normalised annihilation rates $Z_{\rm eff}$, and $\gamma$ spectra as a function of momentum $k$, {\tt ANTICOOL} enables the calculation of the positron momentum distribution $f(k,t)$ as a function of time $t$, the time-varying normalised annihilation rate $\bar{Z}_{\rm eff}(t)$, the lifetime spectrum and time-varying annihilation $\gamma$ spectra. The capability and functionality of the program is demonstrated via a tutorial-style example for positron cooling and annihilation in room temperature helium gas, using accurate scattering and annihilation cross sections and $\gamma$ spectra calculated using many-body theory as input.
Original language English 362-370 Computer Physics Communications 224 02 Dec 2017 https://doi.org/10.1016/j.cpc.2017.11.012 Published - Mar 2018

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• ### R1579TCP: Many-body Theory of Position Interactions with Atoms and Molecules

Green, D.

30/10/2015 → …

Project: Research