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2024-11-23 17:43

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Conference: Bucharest University Faculty of Physics 2014 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Corrections to Lindhard partition functions at low energies in semiconductors

Authors:

Sorina LAZANU (1), Ionel LAZANU (2)

Affiliation:

1) National Institute of Materials Physics, PO Box MG 7, 077125, Magurele, Romania

2) Faculty of Physics, University of Bucharest, POBox MG-11, Magurele-Bucharest

E-mail

ionel.lazanu@g.unibuc.ro

Keywords:

detectors, Lindhard partition factor, low energy, transient thermal effects, semiconductors

Abstract:

The energy partitioning into elastic nuclear scattering and ionization collisions for low energy ions lowing down in different materials is important for the prediction of the detection efficiency and the calculation of the damage induced by such ions in electronic devices. The partition factor calculated using Lindhard’s theory do not agree with experimental data for low energy ions. We present a correction to the Lindhard partition factor due to transient thermal effects induced by the energy deposited by projectiles in Si and Ge, for applications in bolometers used in the detection of Dark Matter. There is considerable experimental effort dedicated to the direct detection of the heavy component of dark matter. Transient processes which take place during the energy transfer from the proiectile to the detector material are treated in the frame of a thermal spike model. The atomic and electronic subsystems of the target are coupled through electron-phonon interaction. The energy eventually transferred between these subsystems is evaluated, and its effect is considered as a correction to the Lindhard factor. Comparison with experimental data at low energy in Si and Ge is also presented.