The Computer Code for Calculations of the Positron Distribution in a Layered Stack Systems

• Authors: K. Siemek , J. Dryzek
• Languages of publication: EN

Abstracts

EN

In this paper we present experimental and theoretical studies of the implantation profile of positrons emitted from ^{22}Na radionuclide into layered sample. The measured profile for the nonsymmetrical, around the positron emitter, stack of aluminium and silver foils was measured using the depth scanning of implantation profile technique. For the description of the obtained results two theoretical approaches were applied. The first one was the Monte Carlo simulation using the GEANT4 tool kit. The generated profile does not reproduce accurately the experimental profile. We proposed the multiple scattering model based on the fact that a positron due to backscattering can travel as an energetic particle several times through the whole sample before it annihilates. In this model absorption is also taken into account. The multiple scattering model algorithm was implemented in the LYS-1 program. The calculated profile using the LYS-1 program reproduces the experimental profile with much better accuracy.

Keywords

EN

78.70.Bj; 52.25.Tx

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 52.25.Tx: Emission, absorption, and scattering of particles

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 3
• Pages: 833-836

Dates

published

2014-03

Contributors

author

K. Siemek

• Institute of Nuclear Physics PAS, E. Radzikowskiego 152, 31-342 Kraków, Poland

author

J. Dryzek

• Institute of Nuclear Physics PAS, E. Radzikowskiego 152, 31-342 Kraków, Poland
• Institute of Physics, Opole University, Oleska 48, 45-052 Opole, Poland

References

• [1] J. Dryzek, P. Horodek, Nucl. Instrum. Methods Phys. Res. B 269, 1411 (2011), doi:10.1016/j.nimb.2011.03.025
• [2] J. Dryzek, K. Siemek, J. Appl. Phys. 114, 074904 (2013), doi:10.1063/1.4818578
• [3] K. Siemek, http://www.ifj.edu.pl/ mdryzek/page_r22.html
• [4] I.K. MacKenzie, C.W. Schutle, T. Jackmann, J.L. Campbell, Phys. Rev. A 7, 135 (1973), doi:10.1103/PhysRevA.7.135
• [5] J. Dryzek, E. Dryzek, Phys. Lett. A 320, 238 (2003), doi:10.1016/j.physleta.2003.11.012
• [6] P.U. Arifov, A.R. Grupper, H. Alimkulov, Positron Annihilation, Ed. P.G. Coleman, North-Holland, Amsterdam 1982, p. 699
• [7] Nathu Ram, I.S. Sundara Rao, M.K. Mehta, Pramana 18, 121 (1981)
• [8] J. Dryzek, D. Singleton, Nucl. Instrum. Methods Phys. Res. B 252, 197 (2006), doi:10.1016/j.nimb.2006.08.017
• [9] G.I. Gleason, I.D. Taylor, D.L. Tabern, Nucleonics 8, 12 (1951)
• [10] J. Dryzek, P. Horodek, Nucl. Instrum. Methods Phys. Res. B 267, 3580 (2009), doi:10.1016/j.nimb.2009.08.020
• [11] J. Dryzek, Appl. Phys. A 81, 1099 (2005), doi:10.007/s00339-004-2966-6
• [12] GEANT4 web page: http://cern.ch/geant4

Identifiers

DOI

10.12693/APhysPolA.125.833