Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Progress on the CeNTREX TlF Schiff Moment Search

Jul 19, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Precision measurement and tests of fundamental physics Poster session


The The aim of CeNTREX (Cold molecule Nuclear Time-Reversal Experiment) is to search for the proton’s electric dipole moment by measuring the Schiff moment it induces in the $^{205}$Tl nucleus. We use the amplified energy shift from the Schiff moment that is present in the polar molecule thallium fluoride (TlF). To maximize the population of the science state, we employ rotational cooling on the cold TlF beam, which pumps lowest few rotational states into a single J=0 hyperfine level of the $^1$Σ$^+$ electronic ground state. Electrostatic focusing with a quadrupole lens will be used to efficiently direct molecules to a downstream detection region; this requires a weak-field seeking state. This is achieved by adiabatic state transfer from J=0 to J=2 with microwaves. Finally, the Schiff moment measurement requires careful nulling of magnetic fields in the interaction region. Characterization of a new magnetic shielding system is ongoing.

*This work is funded by the Heising-Simons Foundation, NSF and the U.S. DOE, Office of Science, Office of Nuclear Physics, under contract DE-AC02-06CH11357.

Presenter name Olivier Grasdijk
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Primary authors

Olivier Grasdijk (Argonne National Laboratory) David DeMille (University of Chicago & Argonne National Laboratory) Jakob Kastelic (Yale University) David Kawall (University of Massachusetts, Amherst) Steve Lamoreaux (Yale University) Oskari Timgren (Yale University) Jianhui Li (Columbia University) Tristan Winick (University of Massachusetts, Amherst) Yanhang Yang (University of Chicago) Tanya Zelevinsky (Columbia University)

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