TY - JOUR
T1 - Development of polarized 3He gas system as a spin analyzer for low energy neutrons
AU - Sakai, K.
AU - Sato, H.
AU - Yoshimi, A.
AU - Asahi, K.
AU - Masuda, Y.
AU - Muto, S.
AU - Ishimoto, S.
AU - Morimoto, K.
AU - Masaike, A.
AU - Iinuma, M.
AU - Matsuda, Y.
AU - Okumura, K.
AU - Haseyama, T.
PY - 1998/1/11
Y1 - 1998/1/11
N2 - 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.
AB - 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.
KW - Effect of symmetry violation
KW - Neutron spin analyzer
KW - Polarized He filter
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U2 - 10.1016/S0168-9002(97)00843-7
DO - 10.1016/S0168-9002(97)00843-7
M3 - Article
AN - SCOPUS:0031698858
SN - 0168-9002
VL - 402
SP - 244
EP - 246
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2-3
ER -