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Contrast variation small-angle neutron scattering by dynamic nuclear polarization method; Investigation on crystalline structure of polyethylene

Noda, Yohei; Kumada, Takayuki   ; Koizumi, Satoshi; Hashimoto, Takeji

We polarized nuclear spins in hydrogen atoms of polyethylene samples doped with organic radical (TEMPO) by use of dynamic nuclear polarization (DNP), in which the sample was irradiated by millimeter wave (94 GHz) at 3.3 Tesla and 1.4 K. For the samples under the DNP state, we conducted small-angle scattering experiment with polarized neutrons. For low crystalline sample (polarization: 43%), the shift of the incoherent scattering level was observed. For highly crystalline sample (polarization: 26%), the enhancement of the coherent scattering due to the crystalline structure was observed.

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