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

R. C. Gillis; R. 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. Lauss; M. 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

doi:10.1088/1742-6596/239/1/012012

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

R. C. Gillis, R. 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

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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 A_γ 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 A_γ at the Los Alamos Neutron Science Center with the preliminary result A_γ (-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 A_γ is in progress at the Spallation Neutron Source at Oak Ridge National Laboratory.

Original language	English
Article number	012012
Journal	Journal of Physics: Conference Series
Volume	239
DOIs	https://doi.org/10.1088/1742-6596/239/1/012012
State	Published - 2010

ASJC Scopus subject areas

General Physics and Astronomy

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10.1088/1742-6596/239/1/012012

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Gillis, R. C., Alarcon, R., 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., ... Yuan, V. (2010). NPDGamma: A measurement of the parity-violating gamma asymmetry A _γ in n-p capture. Journal of Physics: Conference Series, 239, Article 012012. https://doi.org/10.1088/1742-6596/239/1/012012

@article{79c60393577d417ea26682fc4faf15e3,

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

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.",

author = "Gillis, {R. C.} and R. Alarcon and S. Balascuta and L. Barr{\'o}n-Palos and Bowman, {J. D.} and Carlini, {R. D.} and W. Chen and Chupp, {T. E.} and C. Crawford and S. Covrig and M. Dabaghyan and N. Fomin and Freedman, {S. J.} and Gentile, {T. R.} and Gericke, {M. T.} and Greene, {G. L.} and Hersman, {F. W.} and T. Ino and Jones, {G. L.} and B. Lauss and M. Leuschner and Lozowski, {W. R.} and R. Mahurin and Y. Masuda and J. Mei and Mitchell, {G. S.} and S. Muto and H. Nann and Page, {S. A.} and Penttil{\"a}, {S. I.} and Ramsay, {W. D.} and A. Salas-Bacci and S. Santra and M. Sharma and Seo, {P. N.} and Sharapov, {E. I.} and Smith, {T. B.} and Snow, {W. M.} and Wilburn, {W. S.} and V. Yuan",

year = "2010",

doi = "10.1088/1742-6596/239/1/012012",

language = "English",

volume = "239",

}

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

TY - JOUR

T1 - NPDGamma

T2 - A measurement of the parity-violating gamma asymmetry A γ in n-p capture

AU - Gillis, R. C.

AU - Alarcon, R.

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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=78651109827&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78651109827&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/239/1/012012

DO - 10.1088/1742-6596/239/1/012012

M3 - Article

AN - SCOPUS:78651109827

SN - 1742-6588

VL - 239

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

M1 - 012012

ER -

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

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