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Study of neutron-nuclear spin correlation term with a polarized xenon target

Sakai, Kenji ; Oku, Takayuki; Okudaira, Takuya; Kai, Tetsuya ; Harada, Masahide; Hiroi, Kosuke; Hayashida, Hirotoshi*; Shimizu, Hirohiko*; Yamamoto, Tomoki*; Ino, Takashi*; Hirota, Katsuya*

In neutron fundamental physics, a study of correlation term $${bf s}cdot{bf I}$$ of a neutron spin ${bf s}$ and a target nuclear spin ${bf I}$ is important because the $${bf s}cdot{bf I}$$ term interferes to parity non-conserving (PNC) and time reversal non-conserving (TRNC) terms. For this study, a xenon (Xe) is an interesting nucleus because it has been observed an enhancement of PNC effect around neutron resonance peaks, and polarizes up to $$10^{-2}sim 10^{-1}$$ by using a spin exchange optical pumping (SEOP) method. We attempted to develop a polarized Xe target in a compact in-situ SEOP system and measure neutron polarizing ability caused by the $${bf s}cdot{bf I}$$ term at a 9.6 eV s-wave resonance peak of $$^{129}$$Xe, by detecting change $$Delta R_P$$ of a ratio between neutron transmissions with the polarized and unpolarized Xe target. As preliminary results, we observed a signified value of $$Delta R_{P} approx 0.01$$ after demonstrating that our apparatus could distinguish Doppler broadening effect as systematic error.

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