Neutron Beam Effects on Spin-Exchange-Polarized 3He
Creators
- 1. FOCUS Center and Physics Department, University of Michigan, Ann Arbor, Michigan 48104 (United States)
- 2. Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France)
- 3. Universidad Nacional Autonoma de Mexico, Mexico, D.F. 04510 (Mexico)
- 4. Arizona State University, Tempe, Arizona 85287 (United States)
- 5. Physikalisches Institut, Universitaet Heidelberg, Philosophenweg 12, 69120 Heidelberg (Germany)
- 6. ISIS, Rutherford Appleton Labs, Chilton, Didcot OX11 0QX (United Kingdom)
- 7. National Institute of Standard and Technology, Gaithersburg, Maryland 20899-8461 (United States)
- 8. Los Alamos National Lab, Los Alamos, New Mexico 87545 (United States)
- 9. Oak Ridge National Lab, Oak Ridge, Tennessee 37831 (United States)
- 10. University of Wisconsin, Madison, Wisconsin 53706 (United States)
Description
We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal spin-exchange-polarized 3He cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable 3He polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure alkali-metal polarization and spin relaxation over a range of neutron fluxes at Los Alamos Neutron Science Center and Institute Laue-Langevin. The data reveal a new alkali-metal spin-relaxation mechanism that approximately scales as √(φn), where φn is the neutron capture-flux density incident on the cell. This is consistent with an effect proportional to the concentration of electron-ion pairs but is much larger than expected from earlier work
Additional details
Identifiers
- DOI
- 10.1103/PhysRevLett.101.083002;
- arXiv
- arXiv:0802.3169v1;
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 101
- Journal Issue
- 8
- Journal Page Range
- p. 083002-083002.5
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40015513
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- ALKALI METALS; CAPTURE; COLD NEUTRONS; DEPOLARIZATION; ELECTRONS; FLUX DENSITY; HELIUM 3; ION PAIRS; NEUTRON BEAMS; NEUTRON FLUX; NEUTRON REACTIONS; POLARIZATION; SPIN; SPIN EXCHANGE
- Descriptors DEC
- ANGULAR MOMENTUM; BARYON REACTIONS; BARYONS; BEAMS; ELEMENTARY PARTICLES; ELEMENTS; EVEN-ODD NUCLEI; FERMIONS; HADRON REACTIONS; HADRONS; HELIUM ISOTOPES; ISOTOPES; LEPTONS; LIGHT NUCLEI; METALS; NEUTRONS; NUCLEAR REACTIONS; NUCLEI; NUCLEON BEAMS; NUCLEON REACTIONS; NUCLEONS; PARTICLE BEAMS; PARTICLE PROPERTIES; RADIATION FLUX; STABLE ISOTOPES
Optional Information
- Notes
- (c) 2008 The American Physical Society