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Collett B, Anderman R, Balashov S, Bateman FB, Byrne J, Dewey MS, Fisher BM, Goldin L, Jones G, Komives A, Konopka T, Leuschner M, Mostovoy Y, Nico JS, Thompson AK, Trull C, Wietfeldt FE, Wilson R, Yerozolimsky BG. Proposed Measurement of the Beta-Neutrino Correlation in Neutron Decay. J Res Natl Inst Stand Technol 2005; 110:401-405. [PMID: 27308157 PMCID: PMC4852822 DOI: 10.6028/jres.110.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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
Currently, the beta-neutrino asymmetry has the largest uncertainty (4 %) of the neutron decay angular correlations. Without requiring polarimetry this decay parameter can be used to measure λ (ga/gv ), test Cabibbo-Kobayashi-Maskawa (CKM) unitarity limit scalar and tensor currents, and search for Charged Vector Current (CVC) violation. We propose to measure the beta-neutrino asymmetry coeffcient, a, using time-of-flight for the recoil protons. We hope to achieve a systematic uncertainty of σa / a ≈ 1.0 %. After tests at Indiana University's Low Energy Neutron Source (LENS), the apparatus will be moved to the National Institute of Standards and Technology (NIST) where the measurement can achieve a statistical uncertainty of 1 % to 2 % in about 200 beam days.
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Affiliation(s)
- B Collett
- Physics Department, Hamilton College, Clinton, NY 13323
| | - R Anderman
- Physics Department, Hamilton College, Clinton, NY 13323
| | | | - F B Bateman
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - J Byrne
- University of Sussex, United Kingdom
| | - M S Dewey
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - B M Fisher
- Department of Physics, Tulane University, New Orleans, LA 70118
| | - L Goldin
- Physics Department, Harvard University, Cambridge, MA 02139
| | - G Jones
- Physics Department, Hamilton College, Clinton, NY 13323
| | - A Komives
- Physics Department, DePauw University, Greencastle, IN 46135
| | - T Konopka
- Physics Department, Hamilton College, Clinton, NY 13323
| | - M Leuschner
- Indiana University Cyclotron Facility, Bloomington, IN 47408
| | | | - J S Nico
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - A K Thompson
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - C Trull
- Department of Physics, Tulane University, New Orleans, LA 70118
| | - F E Wietfeldt
- Department of Physics, Tulane University, New Orleans, LA 70118
| | - R Wilson
- Physics Department, Harvard University, Cambridge, MA 02139
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Komives A, Wietfeldt FE, Trull C, Bateman FB, Dewey MS, Thompson AK, Anderman R, Balashov S, Mostovoy Y. A Backscatter Suppressed Electron Detector for the Measurement of "a". J Res Natl Inst Stand Technol 2005; 110:431-436. [PMID: 27308163 PMCID: PMC4852833 DOI: 10.6028/jres.110.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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
A new method of measuring the electron-antineutrino angular correlation coefficient, little "a", from neutron decay-to be performed at the National Institute of Standards and Technology-will require an electron spectrometer that strongly suppresses backscattered electrons. A prototype consisting of six trapezoidal veto detectors arranged around a plastic scintillator has been tested with an electron beam produced by a Van de Graaff accelerator. The results of this test and its implications for the little "a" measurement are discussed.
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Affiliation(s)
- A Komives
- DePauw University, Greencastle, IN 46135
| | | | - C Trull
- Tulane University, New Orleans, LA 70118
| | - F B Bateman
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - M S Dewey
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - A K Thompson
- National Institute of Standards and Technology, Gaithersburg, MD 20899
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