NPDGamma: A measurement of the parity-violating gamma asymmetry A γ in n-p capture

R. C. Gillis, Ricardo Alarcon, S. Balascuta, L. Barrón-Palos, J. D. Bowman, R. D. Carlini, W. Chen, T. E. Chupp, C. Crawford, S. Covrig, M. Dabaghyan, N. Fomin, S. J. Freedman, T. R. Gentile, M. T. Gericke, G. L. Greene, F. W. Hersman, T. Ino, G. L. Jones, B. LaussM. Leuschner, W. R. Lozowski, R. Mahurin, Y. Masuda, J. Mei, G. S. Mitchell, S. Muto, H. Nann, S. A. Page, S. I. Penttilä, W. D. Ramsay, A. Salas-Bacci, S. Santra, M. Sharma, P. N. Seo, E. I. Sharapov, T. B. Smith, W. M. Snow, W. S. Wilburn, V. Yuan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The NPDGamma Experiment measures the parity-violating correlation A γ between neutron spin and photon momentum in the reaction + p d + γ. Knowledge of Aγ and other parity-violating observables in few-body nuclear systems will provide constraints for a parameterized description of ΔS 0 parity-violating phenomena free from complications of nuclear structure. The NPDGamma experiment uses a polarized cold pulsed neutron beam, a liquid parahydrogen target, and a cylindrical array of 48 CsI(Tl) scintillation detectors operated in current mode to search for the asymmetry. NPDGamma recently completed the first phase of the program to measure Aγ at the Los Alamos Neutron Science Center with the preliminary result Aγ (-1.2 2.1(stat.) 0.1(sys.)) × 10-7, reproducing the previous upper limit from a measurement at a reactor facility. We discuss the theoretical background and experimental method and report on preliminary analysis of the LANSCE data. The second phase of the program to measure Aγ is in progress at the Spallation Neutron Source at Oak Ridge National Laboratory.

Original languageEnglish (US)
Article number012012
JournalJournal of Physics: Conference Series
Volume239
DOIs
StatePublished - 2010

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parity
asymmetry
neutrons
neutron beams
spallation
neutron sources
nuclear structure
scintillation
ridges
reactors
momentum
detectors
photons
liquids

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Gillis, R. C., Alarcon, R., Balascuta, S., Barrón-Palos, L., Bowman, J. D., Carlini, R. D., ... Yuan, V. (2010). NPDGamma: A measurement of the parity-violating gamma asymmetry A γ in n-p capture. Journal of Physics: Conference Series, 239, [012012]. https://doi.org/10.1088/1742-6596/239/1/012012

NPDGamma : A measurement of the parity-violating gamma asymmetry A γ in n-p capture. / Gillis, R. C.; Alarcon, Ricardo; Balascuta, S.; Barrón-Palos, L.; Bowman, J. D.; Carlini, R. D.; Chen, W.; Chupp, T. E.; Crawford, C.; Covrig, S.; Dabaghyan, M.; Fomin, N.; Freedman, S. J.; Gentile, T. R.; Gericke, M. T.; Greene, G. L.; Hersman, F. W.; Ino, T.; Jones, G. L.; Lauss, B.; Leuschner, M.; Lozowski, W. R.; Mahurin, R.; Masuda, Y.; Mei, J.; Mitchell, G. S.; Muto, S.; Nann, H.; Page, S. A.; Penttilä, S. I.; Ramsay, W. D.; Salas-Bacci, A.; Santra, S.; Sharma, M.; Seo, P. N.; Sharapov, E. I.; Smith, T. B.; Snow, W. M.; Wilburn, W. S.; Yuan, V.

In: Journal of Physics: Conference Series, Vol. 239, 012012, 2010.

Research output: Contribution to journalArticle

Gillis, RC, Alarcon, R, Balascuta, S, Barrón-Palos, L, Bowman, JD, Carlini, RD, Chen, W, Chupp, TE, Crawford, C, Covrig, S, Dabaghyan, M, Fomin, N, Freedman, SJ, Gentile, TR, Gericke, MT, Greene, GL, Hersman, FW, Ino, T, Jones, GL, Lauss, B, Leuschner, M, Lozowski, WR, Mahurin, R, Masuda, Y, Mei, J, Mitchell, GS, Muto, S, Nann, H, Page, SA, Penttilä, SI, Ramsay, WD, Salas-Bacci, A, Santra, S, Sharma, M, Seo, PN, Sharapov, EI, Smith, TB, Snow, WM, Wilburn, WS & Yuan, V 2010, 'NPDGamma: A measurement of the parity-violating gamma asymmetry A γ in n-p capture', Journal of Physics: Conference Series, vol. 239, 012012. https://doi.org/10.1088/1742-6596/239/1/012012
Gillis, R. C. ; Alarcon, Ricardo ; Balascuta, S. ; Barrón-Palos, L. ; Bowman, J. D. ; Carlini, R. D. ; Chen, W. ; Chupp, T. E. ; Crawford, C. ; Covrig, S. ; Dabaghyan, M. ; Fomin, N. ; Freedman, S. J. ; Gentile, T. R. ; Gericke, M. T. ; Greene, G. L. ; Hersman, F. W. ; Ino, T. ; Jones, G. L. ; Lauss, B. ; Leuschner, M. ; Lozowski, W. R. ; Mahurin, R. ; Masuda, Y. ; Mei, J. ; Mitchell, G. S. ; Muto, S. ; Nann, H. ; Page, S. A. ; Penttilä, S. I. ; Ramsay, W. D. ; Salas-Bacci, A. ; Santra, S. ; Sharma, M. ; Seo, P. N. ; Sharapov, E. I. ; Smith, T. B. ; Snow, W. M. ; Wilburn, W. S. ; Yuan, V. / NPDGamma : A measurement of the parity-violating gamma asymmetry A γ in n-p capture. In: Journal of Physics: Conference Series. 2010 ; Vol. 239.
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T2 - A measurement of the parity-violating gamma asymmetry A γ in n-p capture

AU - Gillis, R. C.

AU - Alarcon, Ricardo

AU - Balascuta, S.

AU - Barrón-Palos, L.

AU - Bowman, J. D.

AU - Carlini, R. D.

AU - Chen, W.

AU - Chupp, T. E.

AU - Crawford, C.

AU - Covrig, S.

AU - Dabaghyan, M.

AU - Fomin, N.

AU - Freedman, S. J.

AU - Gentile, T. R.

AU - Gericke, M. T.

AU - Greene, G. L.

AU - Hersman, F. W.

AU - Ino, T.

AU - Jones, G. L.

AU - Lauss, B.

AU - Leuschner, M.

AU - Lozowski, W. R.

AU - Mahurin, R.

AU - Masuda, Y.

AU - Mei, J.

AU - Mitchell, G. S.

AU - Muto, S.

AU - Nann, H.

AU - Page, S. A.

AU - Penttilä, S. I.

AU - Ramsay, W. D.

AU - Salas-Bacci, A.

AU - Santra, S.

AU - Sharma, M.

AU - Seo, P. N.

AU - Sharapov, E. I.

AU - Smith, T. B.

AU - Snow, W. M.

AU - Wilburn, W. S.

AU - Yuan, V.

PY - 2010

Y1 - 2010

N2 - The NPDGamma Experiment measures the parity-violating correlation A γ between neutron spin and photon momentum in the reaction + p d + γ. Knowledge of Aγ and other parity-violating observables in few-body nuclear systems will provide constraints for a parameterized description of ΔS 0 parity-violating phenomena free from complications of nuclear structure. The NPDGamma experiment uses a polarized cold pulsed neutron beam, a liquid parahydrogen target, and a cylindrical array of 48 CsI(Tl) scintillation detectors operated in current mode to search for the asymmetry. NPDGamma recently completed the first phase of the program to measure Aγ at the Los Alamos Neutron Science Center with the preliminary result Aγ (-1.2 2.1(stat.) 0.1(sys.)) × 10-7, reproducing the previous upper limit from a measurement at a reactor facility. We discuss the theoretical background and experimental method and report on preliminary analysis of the LANSCE data. The second phase of the program to measure Aγ is in progress at the Spallation Neutron Source at Oak Ridge National Laboratory.

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