Bulletin of the American Physical Society
APS April Meeting 2024
Wednesday–Saturday, April 3–6, 2024; Sacramento & Virtual
Session T06: Mini-Symposium: Fundamental Symmetry Tests of Standard Model Physics
3:45 PM–5:33 PM,
Saturday, April 6, 2024
SAFE Credit Union Convention Center
Room: Ballroom A8, Floor 2
Sponsoring
Unit:
DNP
Chair: Dan Melconian, Texas A&M University
Abstract: T06.00003 : Analog-antianalog isospin mixing in 47K β decay and time-reversal symmetry*
4:33 PM–4:45 PM
Presenter:
john Behr
(TRIUMF)
Authors:
john Behr
(TRIUMF)
Brian Kootte
(TRIUMF)
Chaitanya Luktuke
(U. Waterloo)
Hannah Gallop
(U. Waterloo)
Alexandre Gorelov
(TRIUMF)
Brayden M Vargas-Calderon
(Texas AM University)
JOZEF KLIMO
(Texas A&M University)
Dan G Melconian
(Texas A&M University)
James McNeil
(TRIUMF)
Our preliminary result from a weighted average of recoil and beta asymmetries is MF/MGT=-0.096±0.037, implying a Coulomb mixing matrix element 72±29 keV, an order of magnitude larger than measured in other β asymmetry measurements in nearby nuclei. Since 47Ca and 47K are near closed shells, that single known 47Ca 1/2+ state (J.K. Smith PRC 2020) may contain a large fraction of the antianalog configuration and its predicted 190 keV mixing matrix element with the analog [Auerbach, Loc NPA 2022].
Sensitivity to time reversal-odd parity-even (TOPE) inherently isovector [Simonius PRL 1997] N-N interactions through a β-ν-spin correlation is thought to be enhanced in these systems, as they are referenced to Coulomb rather than strong interactions [Barroso, Blin-Stoyle PLB 1973], while in this 47Ca case the nuclear matrix elements of such an isovector TOPE interaction may also escape fragmentation.
*Funding from NSERC, NRC through TRIUMF, DOE, and RBC Foundation
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