Measurement of the neutron beam polarization of BL05/NOP beamline at J-PARC

Measurement of the neutron beam polarization of BL05/NOP beamline at J-PARC

We measured the neutron beam polarization of the BL05/NOP (Neutron Optics and Physics) beamline at J-PARC with an accuracy of less than 10−3 using polarized 3He gas as a neutron spin analyzer. Precise polarimetry of the neutron beam is necessary to understand the beamline optics as well as for the a...

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Veröffentlicht in:Physica. B, Condensed matter Condensed matter, 2011-06, Vol.406 (12), p.2424-2428
Hauptverfasser: Ino, T., Arimoto, Y., Yoshioka, T., Mishima, K., Taketani, K., Muto, S., Shimizu, H.M., Kira, H., Sakaguchi, Y., Oku, T., Sakai, K., Shinohara, T., Suzuki, J., Otono, H., Oide, H., Yamashita, S., Imajo, S., Funahashi, H., Yamada, M., Iwashita, Y., Kitaguchi, M., Hino, M., Suzuki, Z., Sanuki, T., Seki, T., Hirota, K., Ikeda, K., Sato, H., Otake, Y., Ohmori, H., Morishima, T., Shima, T.
Format: Artikel
Sprache:eng
Schlagworte:
3He polarization
Asymmetry
Atom and neutron optics
Beta decay
Classical and quantum physics: mechanics and fields
Condensed matter
Exact sciences and technology
J-PARC
Matter waves
Neutron beams
Neutron beta decay
Neutron sources
Neutron spin filter
Physics
Polarimetry
Polarization
Polarized neutron
Spallation
Spin-exchange optical pumping
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Zusammenfassung:We measured the neutron beam polarization of the BL05/NOP (Neutron Optics and Physics) beamline at J-PARC with an accuracy of less than 10−3 using polarized 3He gas as a neutron spin analyzer. Precise polarimetry of the neutron beam is necessary to understand the beamline optics as well as for the asymmetry measurements of the neutron beta decay, which are planned in this beamline. ► We have measured neutron beam polarization with an accuracy of 0.03% using a 3He neutron spin filter. ► This accuracy was achieved by flipping the 3He polarization with adiabatic fast-passage (AFP) NMR. ► The 3He spin flipping canceled most of systematic uncertainties. ► Such accuracy is necessary for the precise neutron beta decay measurements planned at BL05 of the J-PARC spallation neutron source.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2011.01.009