SLOPOS-15

The Ps Spectroscopy team had the delight of attending the 15th International Workshop on Slow Positron Beam Techniques and Applications (SLOPOS-15) in Prague on 2-6 September, 2019. The workshop was held in the Faculty of Mathematics and Physics, Charles University in the centre of the Lesser Town square.

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A wide range of topics, from Ps physics to defect studies, were discussed by over 100 participants in the workshop. David outlined the recent experimental progress in Ps-laser physics in his talk, while Ross talked about the versatility of a multi-ring guide for possible Ps deceleration and trapping studies. Lokesh presented the results of the new precision microwave spectroscopy experiment (stay tuned for more details). The complete list of abstracts can be found here. It was a pleasure discussing the ongoing work in the field of slow positron physics in the wonderful city of Prague.

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We’d like to thank the local organising committee, led by Jakub Cizek, for organising an excellent meeting and we look forward to the next SLOPOS which will be held in Orléans, France in 2022.

POSMOL 2019

The Ps spectroscopy team recently attended the XX International Workshop on Low-Energy Positron and Positronium Physics and XXI International Symposium on Electron-Molecule Collisions and Swarms i.e. POSMOL-2019. The conference was organised by the Serbian Academy of Sciences and Arts (SASA) in Belgrade on 18-20th July.

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Our most recent work on the microwave spectroscopy of Ps n=2 fine structure (more on this in the next blog post) was presented by Lokesh. It was a great opportunity to discuss our research with the positron (positronium) and the electron community as well as explore ongoing and future research from other groups. The complete list of abstract is available here, as well as the photo gallery.

We’d like to thank the organisers for planning this excellent conference and we look forward to the next meeting. The UCL Ps Spectroscopy group will be attending SLOPOS-15 in Prague in September. See you then!

12th International Workshop on Positron and Positronium Chemistry

Our research group was recently represented by Dr David Cassidy at the 12th International Workshop on Positron and Positronium Chemistry (PPC12), which took place between the 28th of August and 1st of September in in Ludblin, Poland. The main focus of this meeting was the interaction of positrons and positronium with other materials and atoms, including polymers, soft matter, surface states and more.

David presented our recent advances in producing a beam of Rydberg positronium atoms (PRL 117, 073202 & PRA 95, 053409) and the prospects of using such techniques to form the yet-unobserved positron-atom bound states (PRA 93, 052712).

You can have a look at the abstracts in the conference website. We are grateful to the organizers for this opportunity and their hard work.

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.

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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.

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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: