Development of polarized 3He gas system as a spin analyzer for low energy neutrons

K. Sakai, H. Sato, A. Yoshimi, K. Asahi, Y. Masuda, S. Muto, S. Ishimoto, K. Morimoto, A. Masaike, M. Iinuma, Y. Matsuda, K. Okumura, T. Haseyama

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


For use as a spin analyzer for low energy neutrons, a polarized 3He gas system was developed at KEK. The polarization attained of 3He at 3 atm determined as PHe = 40%, through the measurement of the transmission of unpolarized neutrons through the 3He cell. The 3He cell was used in the measurement of P-violating spin rotation of neutrons in the 0.734 eV p-wave resonance of the 139La+n system. As a result, a parity mixing matrix element xW = 1.04 ± 0.40 meV was obtained, which is in agreement with the s- and p-wave resonance mixing model. An attempt is under way to improve the performance of the spin analyzer, by increasing the 3He pressure and incorporating high-power diode lasers. So far we have obtained PHe= 12% at 20 atm.

Original languageEnglish
Pages (from-to)244-246
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
Publication statusPublished - Jan 11 1998
Externally publishedYes


  • Effect of symmetry violation
  • Neutron spin analyzer
  • Polarized He filter

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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