Positrons are the antimatter version of electrons and so their fate in a matter world is ultimately to annihilate. However, prior to this, a positron may combine with an electron to form a matter-antimatter hybrid called positronium. This is akin to a hydrogen atom with the proton replaced by a positron. Fundamental to our understanding of the physical universe, positron and positronium are these days also acknowledged as being fantastically useful in practical applications such as probing material properties and medical diagnostics. However, there is still much that we do not know for sure about the details of the interactions of these particles with ordinary matter. For example if, in a collision with an atom or molecule, a positron captures an electron, in which directions is the positronium likely to travel and with what probability? More...
Published: Jun 17, 2015 12:35:19 PM
How light of different colours is absorbed by carbon dioxide (CO2) can now be accurately predicted using new calculations developed by a UCL-led team of scientists. This will help climate scientists studying Earth’s greenhouse gas emissions to better interpret data collected from satellites and ground stations measuring CO2. More...
Published: Jun 15, 2015 10:29:10 AM
New research from UCL has uncovered additional second laws of thermodynamics which complement the ordinary second law of thermodynamics, one of the most fundamental laws of nature. These new second laws are generally not noticeable except on very small scales, at which point, they become increasingly important. More...
Published: Feb 10, 2015 11:55:53 AM
Details on how to get to UCL by public transport and maps of the campus can be found here.
The nearest underground station is Euston Square station which is serviced by the Circle, Metropolitan and Hammersmith and City underground lines. Euston Station is also nearby (which is separate to Euston Square station) and is about a three minute walk away. Alternatively you can walk from Kings Cross Station - this will take about 15 minutes.
The Department of Physics is located near the north-eastern corner of the main Bloomsbury site. Entry for visitors is through the main quadrangle off Gower Street. Once in the quadrangle enter the department through the door in the far left-hand corner. The following images show the location of the Physics department.