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The traditional approach transport simulation is to measure cross sections and feed them into a code package. However, some cross sections are very difficult to both measure and calculate. The "inverse swarm problem" seeks to extract these cross sections from transport measruements such as current profiles or annihilation rates.
This is a multi-faceted project which can be adapted to students at the honours level and above. A number of possibilities exist to perform experiments directed towards improving the use of positrons in medice, mostly focussed on Positron Emission Tomography (PET).
Characterising plasmas is difficult. This project will explore the possibilty of probing a plasma using positrons by building a model and simulating a positron beam incident on a low-temperature plasma.
Positron emitters are embedded in clouds of dust grains produced by supernova. This project will explore the transport of positrons in dust grains using Monte-Carlo techniques to improve our understanding of positron transport in an astrophysically relevant setting.
A novel approach to low energy electron experiments has been developed, using strong magnetic fields to confine the electron beam. This project will further develop a new apparatus towards making important measurements of scattering cross sections.
Using the atomic and molecular physics positron beam at the ANU, the student will undertake measurements of positron scattering from simple targets, providing high accuracy data to test recent theoretical calculations.
Positronium is a bound state between an electron and a positron. It is hydrogen-like with a binding energy half that of hydrogen. Positronium has been found to scatter like an electron for the same velocity. Electrons can fragment molecules by temporary attaching leading to fragmentation. This project will explore the fragmentation of molecules in positronium scattering with molecules.
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