A Precision Measurement of Neutron {beta}-Decay Angular Correlations with Pulsed Cold Neutrons -- The abBA Experiment
- Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
- Department of Physics, University of New Hampshire, Durham, NH 03824 (United States)
- Department of Physics, University of Michigan, Ann Arbor, MI 48104 (United States)
- Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
- Department of Physics, University of Tennessee, Knoxville, TN 37996 (United States)
- Department of Physics, Indiana University, Bloomington, IN 47405 (United States)
- Department of Physics, University of Virginia, Charlottesville, VA 22904 (United States)
- National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)
The abBA collaboration is developing a new type of field-expansion spectrometer to measure neutron beta decay angular parameters, a, b, B, and A, to the 0.1% precision level. This precision will be achieved by combining three new technical approaches; a pulsed cold neutron beam, a 3He neutron spin filter, and segmented large-area thin-dead layer silicon detectors. Both the electron and proton resulting from the decay will be guided by electric and magnetic fields and detected in coincidence by two 2{pi} solid-angle silicon detectors. For the neutron polarization-dependent observables A and B, a novel precision neutron polarimetry technique has been developed. The parameters a and b will be obtained from the proton time-of-flight and the measured electron energy spectrum. Measurement of the four parameters in the same apparatus provides a redundant determination of parameter {lambda}=gA/gV, providing a test of the standard electroweak interaction.
- OSTI ID:
- 20722659
- Journal Information:
- AIP Conference Proceedings, Vol. 769, Issue 1; Conference: International conference on nuclear data for science and technology, Santa Fe, NM (United States), 26 Sep - 1 Oct 2004; Other Information: DOI: 10.1063/1.1945106; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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