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We have published the first constraints on the spin-dependent, inelastic cross section of WIMPs with 129Xe nuclei using an exposure of 7.64 x 103 kg days of XENON100 data.
The experimental signature is a nuclear recoil observed together with the prompt deexcitation photon around 40 keV. As we saw no evidence for this interaction, a profile likelihood analysis allowed us to set a 90% CL upper limit 3.3 x 10-38 cm2 for a WIMP mass of 100 GeV/c2 . This is the most constraining result to date, and sets the pathway for an analysis of this interaction channel in upcoming, larger dual-phase xenon detectors, such as XENON1T. The results can be found in Phys. Rev. D 98, 022008 (2017).
