Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session L05: Weak Decays
9:00 AM–11:30 AM,
Friday, December 1, 2023
Hilton Waikoloa Village
Room: Queens 4
Chair: Alexis Mercenne, Louisiana State University
Abstract: L05.00002 : Experimental Measurement of Isospin Symmetry Breaking in 47K Beta Decay*
9:15 AM–9:30 AM
Presenter:
Brian Kootte
(TRIUMF)
Authors:
Brian Kootte
(TRIUMF)
Dan G Melconian
(Texas A&M University)
JOZEF KLIMO
(Texas A&M University)
James McNeil
(University of British Columbia)
John A Behr
(TRIUMF)
Alexandre Gorelov
(TRIUMF)
Brayden M Vargas-Calderon
(Texas A&M University)
Hannah Gallop
(University of Waterloo)
While both Charge-Parity (CP) symmetry, and more recently Time (T) symmetry have been shown to be violated in the weak interaction, it remains an open question whether new sources of CP violation could explain the matter-antimatter asymmetry in the universe.
TRIUMF’s Neutral Atom Trap (TRINAT) is equipped to study the angular distribution of all decay products from spin-polarized beta emitting isotopes produced by the Isotope Separator and Accelerator (ISAC) facility. We discuss the latest result from a scheduled experiment in which we plan to simultaneously trap ∼40000 laser-polarized 47K (t1/2 = 17.5 ± 0.24 s) atoms.
Decay from 47K (I=1/2) into the isobaric analog state is energetically forbidden, but instead 80% of the decays proceed via an isospin changing branch to a single I=1/2 state. The recoil asymmetry is made nonzero by the product of the Gamow-Teller and isospin-suppressed Fermi matrix elements, and we plan to measure this effect at TRINAT in order to test analog-antianalog isospin mixing. A future measurement of D Î · vβ × vν would have enhanced sensitivity to isospin-breaking, parity even, T-odd interactions, since constraints from the neutron EDM on D [Ng, Tulin PRD 2012] are relaxed for isospin-breaking interactions.
*Funding provided by Natural Sciences and Engineering Research Council of Canada, National Research Council of Canada through TRIUMF, Israel Science Foundation, U.S. Department Of Energy.
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