ANTICOOL: simulating positron cooling and annihilation in atomic gases

D. G. Green

doi:10.1016/j.cpc.2017.11.012

ANTICOOL: simulating positron cooling and annihilation in atomic gases

D. G. Green

School of Mathematics and Physics

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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
Pages (from-to)	362-370
Journal	Computer Physics Communications
Volume	224
Early online date	02 Dec 2017
DOIs	https://doi.org/10.1016/j.cpc.2017.11.012
Publication status	Published - Mar 2018

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ANTICOOL: Simulating positron cooling and annihilation in atomic gases
Copyright 2017 Elsevier. This manuscript is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited.
Accepted author manuscript, 7.19 MBLicence: CC BY-ND

R1579TCP: Many-body Theory of Position Interactions with Atoms and Molecules
Green, D.
30/10/2015 → …
Project: Research

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title = "ANTICOOL: simulating positron cooling and annihilation in atomic gases",

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.",

author = "Green, {D. G.}",

year = "2018",

month = mar,

doi = "10.1016/j.cpc.2017.11.012",

language = "English",

volume = "224",

pages = "362--370",

journal = "Computer Physics Communications",

issn = "0010-4655",

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AU - Green, D. G.

PY - 2018/3

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N2 - 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.

AB - 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.

U2 - 10.1016/j.cpc.2017.11.012

DO - 10.1016/j.cpc.2017.11.012

M3 - Article

VL - 224

SP - 362

EP - 370

JO - Computer Physics Communications

JF - Computer Physics Communications

SN - 0010-4655

ER -

ANTICOOL: simulating positron cooling and annihilation in atomic gases

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

Cite this