Back-to-back(!) PRLs for CTAMOP researcher Dermot Green

Last updated November 20, 2017 by Andrew Brown

Two papers from EPSRC Fellow and CTAMOP member Dermot Green have appeared back-to-back in the highly prestigious pages of Physical Review Letters.

The papers Phys. Rev. Lett. 119, 203403 (2017) and Phys. Rev. Lett. 119, 203404 (2017) describe the processes of positron cooling and annihilation in room-temperature noble gases, simulated using accurate positron-atom data calculated with the many-body theory developed by the Antimatter and Atomic Many-Body Theory Group at QUB.

The work has enabled the first simultaneous probing of the energy dependence of the positron scattering cross sections, annihilation rates and annihilation gamma spectra, has yielded the best description of long-standing experimental results to date, and has resolved outstanding “puzzles” in the field: e.g., establishing that the significant discrepancy between gas-cell and trap-based measurements of the “thermal” positron annihilation rate in Xenon is a result of the rapid annihilation of low-energy positrons leading to a quasi-steady-state positron momentum distribution that differs from the Maxwell-Boltzmann one.


About CTAMOP:

We are a Research Cluster of the School of Mathematics and Physics at Queen’s University Belfast in Northern Ireland. Our research interests are focused primarily on computational and theoretical physics.

Old Physics Building

The Old Physics Building,
where CTAMOP is situated.