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5–11 Jun 2022
McMaster University
America/Toronto timezone
Welcome to the 2022 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2022!

(G) Optical pumping of francium atoms for the measurement of the 7S-8S scalar to vector transition polarizability ratio.

8 Jun 2022, 14:00
15m
MDCL 1009 (McMaster University)

MDCL 1009

McMaster University

Oral not-in-competition (Graduate Student) / Orale non-compétitive (Étudiant(e) du 2e ou 3e cycle) Nuclear Physics / Physique nucléaire (DNP-DPN) W2-4 Fundamental Symmetries and new physics at low energy II (DNP) | Symétries fondamentales et nouvelle physique à basse énergie II (DPN)

Speaker

Anima Sharma

Description

Low-energy precision electro-weak physics tests are advocated as part of the search for physics beyond the Standard Model. We are working towards a measurement of atomic parity violation (APV) in francium, Fr (Z = 87), the heaviest alkali in a magneto-optical trap (MOT) online to ISAC at TRIUMF. The transition of interest in Fr is between the 7S and 8S states, where the parity violating (PV) observable will be the interference between a parity-conserving “Stark induced” E1 amplitude, created by applying a dc electric field to mix S and P states, and the vastly weaker PV amplitude. To explore the Stark amplitude, in particular the ratio of the scalar to vector transition polarizability, we need to know the population distribution of atoms in the magnetic sublevels, m, of the ground state. I will talk about our strategy for preparing the spin polarization of atomic states in Fr in a MOT which will also help in exploring the m-level dependence of the interference of E1 and our recently observed magnetic dipole M1 amplitude. Following our success in fast switching of the magnetic fields, I will discuss our plan for detection of spin-polarization using Raman techniques, and some improvements for our detection system. These developments will pave the path towards atomic parity violation in francium.
This work is supported by NSERC, NRC, TRIUMF, U Manitoba, U Maryland.

Primary author

Anima Sharma

Co-authors

Timothy Hucko (University of Manitoba) Prof. Gerald Gwinner (University of Manitoba) Alexandre Gorelov (TRIUMF) Andrea Teigelhoefer (TRIUMF) Seth Aubin (William and Marry) Eduardo Gomez (Universidad Autónoma de San Luis Potosí) Luis Orozco (University of Maryland) John Behr (TRIUMF) Mukut Ranjan Kalita (TRIUMF) Dr Matt Pearson (Triumf)

Presentation materials