14th International Workshop on Slow Positron Beam Techniques & Applications

Members of the UCL positronium laser spectroscopy group recently attended the 14th International Workshop on Slow Positron Beam Techniques & Applications (SLOPOS14) in Matsue, Japan. The conference took place from the 22nd to the 27th of May 2016.  During this time we heard many great talks from groups working with positrons and positronium (Ps) from all over the world.

We also presented some of our work, including Rydberg-Stark states of Ps (PRL. 115, 173001), laser-enhanced time-of-flight spectroscopy (NJP. 17, 043059), Ps production in cryogenic environments (PRB 93, 125305), controlling annihilation of excited-state Ps (PRL115, 183401 & PRA93, 012506), and improved SSPALS measurements with LYSO scintillators (NIM. A,  828, 163). The talk “Controlling Annihilation Dynamics of n = 2
Positronium with Electric Fields”, given by Alberto. M. Alonso (PhD student), was awarded a prize for making an outstanding contribution to the conference!

SLOPOS14 was a great opportunity to meet fellow physicists working in our field, to learn of their progress and to share our own.  These meetings are important for discussing new results and new ideas, and for building collaborations for future work. We are extremely grateful to the organisers for their hard work in hosting the event.


We look forward to the next SLOPOS, which will be held in Romania in 2019


Rydberg Positronium Special Report, ICPEAC 2015

One of the conferences that we attended during the summer (ICPEAC 2015) had the necessary set-up to film one of our talks about our recent Rydberg paper, this was summarised on a published IOP abstract.

You can watch our talk along with the rest of the lectures on ICPEAC’s youtube channel: https://www.youtube.com/watch?v=Cytjc2Er2Co.

3rd International Workshop on Antimatter and Gravity

The UCL Positronium Spectroscopy group recently hosted the 3rd International Workshop on Antimatter and Gravity (WAG). The aim of this meeting was to bring together those interested in all aspects of antimatter and gravity, from fundamental theory to direct tests of the weak equivalence principle of general relativity using antiparticles or elements that contain antimatter, e.g. positronium, muonium, or antihydrogen. In our case, we would aim to contribute towards this goal by ultimately making a gravity measurement with positronium.


The workshop was a great opportunity to hear new ideas and theories, to catch-up on the most recent successes and the milestones reached with on-going antimatter experiments, and to learn of the latest proposals for new ways to study antimatter and gravity.

We hope those who attended had as a good time here in London as we did hosting them, and we look forward to meeting again for the next WAG!

For more information and conference materials see the website [https://indico.cern.ch/event/361413/].


Positronium Spectroscopy, Conference season!

The UCL Positronium Spectroscopy group has recently attended the final EU Marie Curie COHERENCE conference, iCoRD (International Conference on Rydbergs at Durham), where we presented our latest Rydberg Positronium results (PRL. 115, 173001). These results will also be presented at the 29th International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC) in Toledo, Spain.

We are now attending the 18th International Workshop on Low-Energy Positron and Positronium Physics & the 19th International Symposium on Electron-Molecule Collisions and Swarms (POSMOL) in Lisbon, Portugal, where we will also be presenting our Positronium time-of-flight spectroscopy (NJP. 17, 043059) results, as well as some of our latest results on Positronium at cryogenic temperatures.

The posters giving a brief overview of the contents in each 3 of these sets of results can be found in our Downloads page: