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Highly polarized very cold neutrons through a permanent magnet quadrupole |
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| Authors: | Kaoru Taketani Kenji Mishima Takashi Ino Tamaki Yoshioka Suguru Muto Takahiro Morishima Hirohiko M Shimizu Takayuki Oku Junichi Suzuki Takenao Shinohara Kenji Sakai Hiromi Sato Katsuya Hirota Yoshie Otake Masaaki Kitaguchi Masahiro Hino Yoshichika Seki Yoshihisa Iwashita Masako Yamada Masahiro Ichikawa Takanori Sugimoto Shinsuke Kawasaki Sachio Komamiya Yoshio Kamiya Hidetoshi Otono Satoru Yamashita Peter Geltenbort |
| Institution: | a KEK, Ibaraki 305-0801, Japan b JAEA, Ibaraki 319-1195, Japan c RIKEN, Saitama 351-0198, Japan d Research Reactor Institute, Kyoto University, Osaka 590-0494, Japan e Department of Physics, Kyoto University, Kyoto 606-8502, Japan f Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan g Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan h International Center for Elementary Particle Physics, The University of Tokyo, Tokyo 113-0033, Japan i Institute Laue-Langevin, BP 156, F-38042 Grenoble Cedex 9, France |
| Abstract: | We obtained highly polarized very cold neutrons through a quadrupole magnet with a large aperture. When neutrons go through a quadrupole magnet, parallel-spin neutrons are attracted to the magnet axis and anti-parallel-spin neutrons are repelled off the axis. Therefore, the neutrons through a sufficiently long quadrupole magnet have completely parallel-spin. At the downstream of the quadrupole magnet, we placed another quadrupole magnet to divide neutrons into two regions depending on their spin directions. We obtained the neutron polarization from the integrated count of the two regions and found it was 99.88±0.09 (stat.)±0.05 (syst.)%. |
| Keywords: | Polarized neutron Neutron polarizer Quadrupole magnet |
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