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First Measurement of Neutron Birefringence in Polarized $^{129}$Xe and $^{131}$Xe Nuclei

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arxiv 2301.00460 v1 pith:L7PQPYVI submitted 2023-01-01 nucl-ex cond-mat.mtrl-scihep-exphysics.atom-phquant-ph

H. Lu , M. J. Barlow , D. Basler , P. Gutfreund , O. Holderer , A. Ioffe , S. Pasini , P. Pistel
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Z. Salhi K. Zhernenkov B. M. Goodson W. M. Snow E. Babcock
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classification nucl-excond-mat.mtrl-scihep-exphysics.atom-phquant-ph
keywords neutronfirstpolarizedbirefringencedeterminenuclear-polarizedscatteringspace
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abstract

We present the first measurements of polarized neutron birefringence in transmission through nuclear-polarized $^{129}$Xe and $^{131}$Xe gas and determine the neutron incoherent scattering lengths $b_i(^{129}Xe)=0.186\pm(0.021)_{stat.}\pm(0.004)_{syst.}\space\text{ fm}$ and $b_i(^{131}Xe)=2.09\pm(0.29)_{stat.}\pm(0.12)_{syst.}\space\text{ fm}$ for the first time. These results determine the essential parameter needed for interpretation of spin-dependent neutron-scattering studies on polarized xenon ensembles, with possible future applications ranging from tests of time-reversal violation to mode-entangled neutron scattering experiments on nuclear-polarized systems.

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