A5008366587- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Therapy and Dosimetry
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Electron and X-Ray Spectroscopy Techniques
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Nuclear physics research studies
- Ion-surface interactions and analysis
- Spacecraft Design and Technology
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- scientometrics and bibliometrics research
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Radiation Effects in Electronics
- History of Science and Natural History
- Spectroscopy and Laser Applications
Curtin University
2014-2019
Australian Research Council
2015
Ion Beam Applications (Belgium)
2000
Kyoto University
1996
The University of Tokyo
1996
Waseda University
1996
Haverford College
1996
College of Wooster
1996
Wabash College
1996
Princeton University
1985
In this work, we develop a wave-packet continuum-discretization approach to ion-atom collisions that includes rearrangement processes. The total scattering wave function is expanded using two-center basis built from pseudostates. exact three-body Schr\"odinger equation converted into coupled-channel differential equations for time-dependent expansion coefficients. the asymptotic region these coefficients represent transition amplitudes all processes including elastic scattering, excitation,...
A silicon-on-insulator diode array with a sensitive depth of 10 microns has been developed for microdosimetry in proton therapy. The detector was coupled to radiation-hard charge amplifier the probe assembly capable measuring an LET down 1.2 keV//spl mu/m. device successfully tested at two therapy centers. 230 MeV Northeastern Proton Therapy Center, Boston and 250 Medical Research Center Tsukuba, Japan. offers much improved spatial resolution compared proportional gas counter particularly...
The atomic hydrogen target has played a pivotal role in the development of quantum collision theory. key complexities computationally managing countably infinite discrete states and uncountably continuum were solved by using as prototype target. In case positron or proton scattering extra complexity charge exchange was also Most recently, molecular been used successfully molecule for developing corresponding We concentrate on convergent close-coupling computational approach to light...
Wavepacket continuum-discretisation approach is used to calculate excitation, ionization and electron-capture (ec) cross sections for proton collisions with n = 2 states of atomic hydrogen, where the principal quantum number. The assumes a classical motion projectile based on solution three-body Schrödinger equation using two-center expansion total scattering wave function. function expanded in an orthonormal basis set built from negative-energy eigenstates wavepacket pseudostates...
Stopping powers of antiprotons in H, He, Ne, Ar, Kr, and Xe targets are calculated using a semiclassical time-dependent convergent close-coupling method. The helium target is treated both frozen-core multiconfiguration approximations. electron-electron correlation the fully accounted for cases. Double ionization with excitation channels taken into account an independent-event model. atom wave functions described model six $p$-shell electrons above frozen Hartree-Fock core only one-electron...
Ionization and electron capture in collisions of bare carbon ions with atomic hydrogen has been studied using the wave-packet continuum discretization approach. The three-body Schr\"odinger equation governing collision process is solved two-center expansion total scattering wave function. Calculations have performed for projectile energy range from 1 keV/amu to 10 MeV/amu. While there excellent agreement experimental data electron-capture cross section over entire range, calculated...
Internal consistency in a close-coupling approach to positron-hydrogen scattering is investigated with particular focus on the potential overlap between atomic and positronium continua. We present results for total, total ionization, $1s$ positronium-formation cross sections projectile energies up 100 eV. show that, irrespective of whether continuum treated by one center, or other, both, same are generally obtained. This true only if sufficiently large orbital angular momentum taken...
Stopping powers of antiprotons in ${\text{H}}_{2}$ and ${\text{H}}_{2}\text{O}$ targets are calculated using a semiclassical time-dependent convergent close-coupling method. In our approach the target is treated two-center molecular multiconfiguration approximation, which fully accounts for electron-electron correlation. Double-ionization dissociative ionization channels taken into account an independent-event model. The vibrational excitation nuclear scattering contributions also included....
We calculate antiproton-impact total single ionization of Ne, Ar, Kr, Xe, and ${\mathrm{H}}_{2}\mathrm{O}$ using a time-dependent convergent close-coupling approach. The Xe atom wave functions are described in model six $p$-shell electrons above frozen Hartree-Fock core with only one-electron excitations from the outer $p$ shell allowed. For treating water molecule we use neonization method recently proposed by Montanari Miraglia [J. Phys. B: At. Mol. Opt. 47, 015201 (2014)], which describes...
The two-center approach to positron-impact ionization of atomic hydrogen is shown follow from the exact post form breakup amplitude [Kadyrov, Bray, Mukhamedzhanov, and Stelbovics, Phys. Rev. Lett. 101, 230405 (2008)]. In such approaches distinct amplitudes arise each center for same process. fully differential cross section calculated including direct target electron capture into positronium continuum. We show that coherent combination leads oscillations in sections, whereas incoherent does...
The stopping cross section for protons passing through hydrogen is calculated the energy range between 10 keV and 3 MeV. Both positive neutral charge states of projectile are accounted for. two-center convergent close-coupling method used to model proton collisions with hydrogen. In this approach, electron-capture channels explicitly included by expanding scattering wave function in a basis both target pseudostates. Hydrogen modeled using two methods: single-center approach calculation...
Proton stopping power in hydrogen is calculated using a hybrid method. A two-centre convergent close-coupling method used for calculations involving the proton fraction of beam, while Born approximation fraction. For proton-hydrogen collisions rearrangement processes are explicitly included via expansion. Hydrogen-hydrogen including one- and two-electron processes. Despite first-order hydrogen-hydrogen channel, overall reasonably good agreement with experiment seen above 100 keV.
Activities undertaken at Curtin University towards developing a comprehensive approach to all aspects of hadron interactions with matter are reviewed.
A two-centre convergent close coupling method is applied to positron-impact ionisation of hydrogen. Different ways distributing the pseudostates representing continuum are investigated. It found that calculations grand total and cross sections independent distribution pseudostates.
The convergent close-coupling method is applied to calculate antiproton and proton stopping cross sections for atomic molecular targets. Excellent agreement with experimental measurements obtained antiprotons in helium while unexpectedly large disagreement found the hydrogen molecule, which inconsistent very good between our ionisation section experiment.
A time-dependent convergent close-coupling approach to antiproton collisions with noble gas atoms and H2O has been developed using a fully multielectron treatment of the targets. Integrated cross sections for single ionisation have calculated in wide range impact energies from 5 keV up 2 MeV. Obtained results are good agreement experiment.