Dr Joshua Machacek

Dr Joshua Machacek
Research Fellow
Plasma Research Laboratory
Office phone
Cockcroft 5 08

Positrons and Dust Grains

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.

Dr Joshua Machacek, Dr Daniel Murtagh

Benchmark positron scattering experiments

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.

A/Prof. James Sullivan, Professor Stephen Buckman, Dr Joshua Machacek

Electron scattering in a magnetic field

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.

A/Prof. James Sullivan, Dr Joshua Machacek

Positron applications in medical physics

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).

A/Prof. James Sullivan, Professor Stephen Buckman, Dr Joshua Machacek

Fragmentation of molecules by positronium

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.

Dr Joshua Machacek, A/Prof. James Sullivan, Professor Stephen Buckman

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