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SUMMARY:The Dawn of Nuclear Supremacy: First Bounds on Ultralight Dark Mat
 ter from the Thorium Isomer Transition
DTSTART;VALUE=DATE-TIME:20250918T130000Z
DTEND;VALUE=DATE-TIME:20250918T132000Z
DTSTAMP;VALUE=DATE-TIME:20260813T095111Z
UID:indico-contribution-457@indico.ift.uam-csic.es
DESCRIPTION:Speakers: Eric Madge (IFT-UAM/CSIC)\nThe recent laser excitati
 on of the low-lying Th-229 isomer transition is starting a revolution in u
 ltralight dark matter searches. The enhanced sensitivity of this transitio
 n to the large class of dark matter models dominantly coupling to quarks a
 nd gluons will ultimately allow us to probe coupling strengths eight order
 s of magnitude smaller than the current bounds from optical atomic clocks\
 , which are mainly sensitive to dark matter couplings to electrons and pho
 tons. We argue that\, with increasing precision\, observations of the Th-2
 29 excitation spectrum will soon give world-leading constraints. Using dat
 a from the pioneering laser excitation of Th-229 by Tiedau et al. [Phys. R
 ev. Lett. 132\, 182501 (2024)]\, we present a first dark matter search in 
 the excitation spectrum. While the exclusion limits of our detailed study 
 of the lineshape are still below the sensitivity of currently operating cl
 ock experiments\, we project the measurement of Zhang et al. [Phys. Rev. L
 ett. 133\, 013201 (2024)] to surpass it.\n\nhttps://indico.ift.uam-csic.es
 /event/29/contributions/457/
LOCATION:IFT UAM/CSIC
URL:https://indico.ift.uam-csic.es/event/29/contributions/457/
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