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

doi:10.1016/S0168-9002(97)00843-7

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 journal › Article › peer-review

9 Citations (Scopus)

Abstract

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 P_He = 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 P_He= 12% at 20 atm.

Original language	English
Pages (from-to)	244-246
Number of pages	3
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	402
Issue number	2-3
DOIs	https://doi.org/10.1016/S0168-9002(97)00843-7
Publication status	Published - Jan 11 1998
Externally published	Yes

Keywords

Effect of symmetry violation
Neutron spin analyzer
Polarized He filter

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Access to Document

10.1016/S0168-9002(97)00843-7

Cite this

Sakai, K., Sato, H., Yoshimi, A., Asahi, K., Masuda, Y., Muto, S., Ishimoto, S., Morimoto, K., Masaike, A., Iinuma, M., Matsuda, Y., Okumura, K., & Haseyama, T. (1998). Development of polarized ³He gas system as a spin analyzer for low energy neutrons. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 402(2-3), 244-246. https://doi.org/10.1016/S0168-9002(97)00843-7

Sakai, K, Sato, H, Yoshimi, A, Asahi, K, Masuda, Y, Muto, S, Ishimoto, S, Morimoto, K, Masaike, A, Iinuma, M, Matsuda, Y, Okumura, K & Haseyama, T 1998, 'Development of polarized ³He gas system as a spin analyzer for low energy neutrons', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 402, no. 2-3, pp. 244-246. https://doi.org/10.1016/S0168-9002(97)00843-7

@article{453155b079d84e6ea3012685c832fafd,

title = "Development of polarized 3He gas system as a spin analyzer for low energy neutrons",

abstract = "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.",

keywords = "Effect of symmetry violation, Neutron spin analyzer, Polarized He filter",

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

year = "1998",

month = jan,

day = "11",

doi = "10.1016/S0168-9002(97)00843-7",

language = "English",

volume = "402",

pages = "244--246",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier B.V.",

number = "2-3",

}

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

UR - http://www.scopus.com/inward/record.url?scp=0031698858&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031698858&partnerID=8YFLogxK

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 -