myUNB News
News for Faculty and Staff

Physics Seminar with Eric Hessels

Author: Penny Davenport

Posted on Nov 19, 2019

Category: News and Notices

A UNBF Physics Department Seminar will be held on Tuesday, Nov. 26, from 1:15 - 2:15 p.m., in the IUC Physics Admin Bldg, 204.

Eric Hessels, York University, will discuss, Testing fundamental physics with table-top precision measurements: The proton size, the fine-structure constant and the electron electric dipole moment.

The talk will describe measurements of the size of the proton, the fine-structure constant and the electric dipole moment of the electron. Two recently completed measurements will be described. In the first, the n=2 Lamb shift of atomic hydrogen is measured, allowing for a new determination of the charge radius of the proton. This determination is crucial to resolving the decade-old proton radius puzzle, in which it appeared that the proton radius took on a different value when measured with muons compared to measurements using electrons. The second measurement is of the n=2 triplet P fine structure of atomic helium, and this work is part of a program to obtain a new determination of the fine-structure constant. Both of these measurements use a new measurements technique: Frequency offset separated oscillatory fields (FOSOF). Finally, a new major effort (EDM^3) is starting at York University to measure the electron electric dipole moment using polar molecules embedded into inert-gas solids. This measurement will test for T violation and will probe physics at PeV energy scales.

Please join us for Colloquium tea in P203 beforehand.

Category: News and Notices

Article Contact Information

Contact: Penny Davenport

Email Address: physics@unb.ca