Response of a proportional counter to $^{37}$Ar and $^{71}$Ge: measured spectra versus Geant4 simulation

TL;DR

This study compares measured energy spectra of $^{37}$Ar and $^{71}$Ge in a proportional counter with Geant4 simulations, introducing modifications to improve low-energy response accuracy for neutrino and dark matter experiments.

Contribution

The paper presents a modified Geant4 code that accurately models atomic shell deexcitation, enhancing low-energy detector response simulations.

Findings

Modified Geant4 reproduces measured spectra in the keV range

Simulation reliability demonstrated for neutrino and dark matter experiments

Improved atomic deexcitation modeling enhances low-energy response accuracy

Abstract

The energy deposition spectra of $^{37}$Ar and $^{71}$Ge in a miniature proportional counter are measured and compared in detail to the model response simulated with Geant4. A certain modification of the Geant4 code, making it possible to trace the deexcitation of atomic shells properly, is suggested. Modified Geant4 is able to reproduce a response of particle detectors in detail in the keV energy range. This feature is very important for the laboratory experiments that search for massive sterile neutrinos as well as for dark matter searches that employ direct detection of recoil nuclei. This work demonstrates the reliability of Geant4 simulation at low energies.