UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

Guest
2024-11-22 2:17
 HOME     CONFERENCES     SEARCH            LOGIN     NEW USER     IMAGES   


Conference: Bucharest University Faculty of Physics 2015 Meeting


Section: Nuclear and Elementary Particles Physics I


Title:
Model of energy exchange through electron-phonon coupling during transient phenomena in materials for detectors


Authors:
Sorina LAZANU(1), Ionel LAZANU(2)


Affiliation:
1) National Institute of Materials Physics, Atomistilor Str., No. 105 bis PO Box MG 7, 077125, Magurele

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




E-mail
ionel.lazanu@g.unibuc.ro


Keywords:
detectors, Lindhard partition, energy exchange, electron-phonon coupling


Abstract:
There is a high interest in experimental studies dedicated to the direct detection of particle dark matter and also for detailed studies of processes induced by neutrinos. The efforts of progressively reducing or rejecting background events have the aim of obtaining a spectrum of these rare nuclear recoil events and to exploit also the signal from low energy recoils. The discrepancies observed between different measurements in semiconductor or in noble gas detectors accumulated during more dozens years put in evidence the importance of understanding the phenomena produced by low energy nuclear recoils. Different explanations were tried in the literature. In this contribution we show that the Lindhard theory generally used to describe the interaction processes in detectors is consistent with most of experimental data for semiconductors if the model of exchange of energy between electronic and lattice subsystems during transient thermal effects produced following the primary interaction of the particle in the target is considered [1]. At the empirical level, simultaneous measurement of the number of primary scintillation photons and ionized electrons in liquid xenon [2] are supported using the combined (scintillation and ionization) energy deposited. A tentative to generalize the use of energy exchanged during transient phenomena in the calculation of energy partition between ionisation, phonons and scintillation in solid noble gases is done. The main practical difficulties are put in evidence.


References:

[1] I. Lazanu, S. Lazanu, arXiv:1505.06340v1

[2] P. Sorensen, C. E. Dahl, Phys. Rev. D 83:063501 (2011)