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Wilburn WS, Bowman JD, Mitchell GS, O'Donnell JM, Penttila SI, Seo PN, Calarco JR, Hersmann FW, Chupp TE, Cianciolo TV, Rykaczewski KP, Young GR, De Souza RT, Snow WM, Desai D, Greene GL, Grzywacz RK, Frlez E, Pocanic D, Gentile TR, Gudkov V, Jones GL. Measurement of Neutron Decay Parameters-The abBA Experiment. J Res Natl Inst Stand Technol 2005; 110:389-393. [PMID: 27308155 PMCID: PMC4852843 DOI: 10.6028/jres.110.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 08/11/2004] [Indexed: 06/06/2023]
Abstract
We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10(-4). The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized (3)He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = gA/gV . Uncertainty in λ dominates the uncertainty of CKM unitarity tests.
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Affiliation(s)
- W S Wilburn
- Los Alamos National Laboratory, Los Alamos, NM 87544
| | - J D Bowman
- Los Alamos National Laboratory, Los Alamos, NM 87544
| | - G S Mitchell
- Los Alamos National Laboratory, Los Alamos, NM 87544
| | - J M O'Donnell
- Los Alamos National Laboratory, Los Alamos, NM 87544
| | - S I Penttila
- Los Alamos National Laboratory, Los Alamos, NM 87544
| | - P-N Seo
- Los Alamos National Laboratory, Los Alamos, NM 87544
| | - J R Calarco
- University of New Hampshire, Durham, NH 03824
| | | | - T E Chupp
- University of Michigan, Ann Arbor, MI 48109
| | | | | | - G R Young
- Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | | | - W M Snow
- Indiana University, Bloomington, IN 47408
| | - D Desai
- University of Tennessee, Knoxville, TN 37996
| | - G L Greene
- University of Tennessee, Knoxville, TN 37996
| | | | - E Frlez
- University of Virginia, Charlottesville, VA 22904
| | - D Pocanic
- University of Virginia, Charlottesville, VA 22904
| | - T R Gentile
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - V Gudkov
- University of South Carolina, Columbia, SC 29208
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