NPDGamma: A measurement of the parity-violating gamma asymmetry A ? in n-p capture
Por:
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., 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.
Publicada:
1 ene 2010
Categoría:
Physics and Astronomy (miscellaneous)
Resumen:
The NPDGamma Experiment measures the parity-violating correlation A ? between neutron spin and photon momentum in the reaction + p d + ?. Knowledge of A? and other parity-violating observables in few-body nuclear systems will provide constraints for a parameterized description of ?S 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? at the Los Alamos Neutron Science Center with the preliminary result A? (-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? is in progress at the Spallation Neutron Source at Oak Ridge National Laboratory. © 2010 IOP Publishing Ltd.
Filiaciones:
Gillis R.C.:
Indiana University, Bloomington, IN 47405, United States
Alarcon R.:
Arizona State University, Tempe, AZ 85287, United States
Balascuta S.:
Arizona State University, Tempe, AZ 85287, United States
Barrón-Palos L.:
Universidad Nacional Autónoma de México, C.P. 04510, D.F., Mexico
Bowman J.D.:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Carlini R.D.:
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, United States
Chen W.:
Indiana University, Bloomington, IN 47405, United States
Chupp T.E.:
University of Michigan, Ann Arbor, MI 48104, United States
Crawford C.:
University of Kentucky, Lexington, KY 40506, United States
Covrig S.:
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, United States
Dabaghyan M.:
University of New Hampshire, Durham, NH 03824, United States
Fomin N.:
University of Tennessee, Knoxville, TN 37996, United States
Freedman S.J.:
University of California, Berkeley, CA 94720-7300, United States
Gentile T.R.:
National Institute of Standards and Technology, Gaithersburg, MD 20899-0001, United States
Gericke M.T.:
University of Manitoba, Winnipeg, MB R3T 2N2, Canada
Greene G.L.:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
University of Tennessee, Knoxville, TN 37996, United States
Hersman F.W.:
University of New Hampshire, Durham, NH 03824, United States
Ino T.:
High Energy Accelerator Research Organization, Oho 1-1, Tsukuba-shi, 305-0801, Japan
Jones G.L.:
Hamilton College, Clinton, NY 13323, United States
Lauss B.:
Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Leuschner M.:
Indiana University, Bloomington, IN 47405, United States
Lozowski W.R.:
Indiana University, Bloomington, IN 47405, United States
Mahurin R.:
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, United States
University of Manitoba, Winnipeg, MB R3T 2N2, Canada
Masuda Y.:
High Energy Accelerator Research Organization, Oho 1-1, Tsukuba-shi, 305-0801, Japan
Mei J.:
Indiana University, Bloomington, IN 47405, United States
Mitchell G.S.:
Department of Biomedical Engineering, University of California, Davis, CA 95616, United States
Muto S.:
High Energy Accelerator Research Organization, Oho 1-1, Tsukuba-shi, 305-0801, Japan
Nann H.:
Indiana University, Bloomington, IN 47405, United States
Page S.A.:
University of Manitoba, Winnipeg, MB R3T 2N2, Canada
Penttilä S.I.:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Ramsay W.D.:
TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
Salas-Bacci A.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Santra S.:
Indiana University, Bloomington, IN 47405, United States
Bhabha Atomic Research Center, Trombay, Mumbai 400085, India
Sharma M.:
University of Michigan, Ann Arbor, MI 48104, United States
Seo P.-N.:
Department of Physics, North Carolina State University, Raleigh, NC 27695, United States
Sharapov E.I.:
Joint Institute for Nuclear Research, Dubna, Russian Federation
Smith T.B.:
University of Dayton, Dayton, OH 45469, United States
Snow W.M.:
Indiana University, Bloomington, IN 47405, United States
Wilburn W.S.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Yuan V.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
All Open Access, Bronze
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