Speaker
Stephane Chauvie
(INFN Genova)
Description
An original model is presented for the simulation of the energy loss of negatively
charged hadrons: it calculates the stopping power by regarding the target atoms as an
ensemble of quantum harmonic oscillators.
This approach allows to account for charge dependent effects in the stopping power,
which are relevant at low energy: the differences between the stopping powers of
positive and negative charged hadrons may amount to approximately a factor two, which
is significant when high precision is required for the evaluation of energy deposit
distributions. Related use case are the tails of energy distributions in the
development of showers, the environment of radiation background monitors, experiments
for antimatter searches, and the recent interest demonstrated for the possible
therapeutic applications of antiproton beams.
The resulting antiproton stopping powers for different elements are compared against
measurements at CERN antiproton experiments and are shown to be in satisfactory
agreement with experimental data.
The model described is implemented in the Low Energy Electromagnetic package of the
Geant4 Toolkit; it represents a significant improvement for the accurate simulation
of low energy negative hadrons with respect to previously available models.
Authors
Dr
Maria Grazia Pia
(INFN GENOVA)
Stephane Chauvie
(INFN Genova)
