Published January 11, 1998 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Tokyo Inst. of Tech. (Japan). Dept. of Applied Physics
  • 2. National Laboratory for High Energy Physics (KEK), Oho, Tsukuba 305 (Japan)
  • 3. Department of Physics, Kyoto University, Kitashirakawa, Kyoto 606-01 (Japan)

Description

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. (orig.)

Additional details

Publishing Information

Journal Title
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Journal Volume
402
Journal Issue
2-3
Journal Page Range
p. 244-246.
ISSN
0168-9002
CODEN
NIMAER

Conference

Title
7. RCNP international workshop on polarized 3He beams and gas targets and their application (Helion).
Dates
20-24 Jan 1997.
Place
Kobe (Japan).

INIS

Country of Publication
Netherlands
Country of Input or Organization
Netherlands
INIS RN
29019444
Subject category
S43: PARTICLE ACCELERATORS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
BEAM TRANSPORT; CONFIGURATION MIXING; EXCITED STATES; EXPERIMENTAL DATA; HELIUM; HELIUM 3; LANTHANUM 139 TARGET; LANTHANUM 140; MATRIX ELEMENTS; MEDIUM PRESSURE; MILLI EV RANGE; NEUTRON BEAMS; NEUTRON REACTIONS; P INVARIANCE; PARITY; POLARIZED BEAMS; RESONANCE; SPIN ORIENTATION; SYMMETRY BREAKING
Descriptors DEC
BARYON REACTIONS; BEAMS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; DATA; DAYS LIVING RADIOISOTOPES; ELEMENTS; ENERGY LEVELS; ENERGY RANGE; EVEN-ODD NUCLEI; HADRON REACTIONS; HELIUM ISOTOPES; INFORMATION; INTERACTIONS; INTERMEDIATE MASS NUCLEI; INVARIANCE PRINCIPLES; ISOTOPES; LANTHANUM ISOTOPES; LIGHT NUCLEI; NONMETALS; NUCLEAR REACTIONS; NUCLEI; NUCLEON BEAMS; NUCLEON REACTIONS; NUMERICAL DATA; ODD-ODD NUCLEI; ORIENTATION; PARTICLE BEAMS; PARTICLE PROPERTIES; RADIOISOTOPES; RARE EARTH NUCLEI; RARE GASES; STABLE ISOTOPES; TARGETS

Optional Information

Notes
9 refs.