First Observation of P-odd gamma Asymmetry in Polarized Neutron Capture on Hydrogen
Por:
Blyth, D., Fry, J., Fomin, N., Alarcon, R., Alonzi, L., Askanazi, E., Baessler, S., Balascuta, S., Barron-Palos, L., Barzilov, A., Bowman, J. D., Birge, N., Calarco, J. R., Chupp, T. E., Cianciolo, V., Coppola, C. E., Crawford, C. B., Craycraft, K., Evans, D., Fieseler, C., Frlez, E., Garishvili, I., Gericke, M. T. W., Gillis, R. C., Grammer, K. B., Greene, G. L., Hall, J., Hamblen, J., Hayes, C., Iverson, E. B., Kabir, M. L., Kucuker, S., Lauss, B., Mahurin, R., McCrea, M., Maldonado-Velazquez, M., Masuda, Y., Mei, J., Milburn, R., Mueller, P. E., Musgrave, M., Nann, H., Novikov, I., Parsons, D., Penttila, S. I., Pocanic, D., Ramirez-Morales, A., Root, M., Salas-Bacci, A., Santra, S., Schroeder, S., Scott, E., Seo, P. -N., Sharapov, E. I., Simmons, F., Snow, W. M., Sprow, A., Stewart, J., Tang, E., Tang, Z., Tong, X., Turkoglu, D. J., Whitehead, R., Wilburn, W. S.
Publicada:
13 dic 2018
Categoría:
Physics and astronomy (miscellaneous)
Resumen:
We report the first observation of the parity-violating gamma-ray
asymmetry A(gamma)(np) in neutron-proton capture using polarized cold
neutrons incident on a liquid parahydrogen target at the Spallation
Neutron Source at Oak Ridge National Laboratory. A(gamma)(np) isolates
the Delta I = 1, S-3(1)-> P-3(1) component of the weak nucleon-nucleon
interaction, which is dominated by pion exchange and can be directly
related to a single coupling constant in either the DDH meson exchange
model or pionless effective field theory. We measured A(gamma)(np) =
[-3.0 +/- 1.4(stat) +/- 0.2(syst)] x 10(-8), which implies a DDH weak
pi NN coupling of h(pi)(1) = [2.6 +/- 1.2(stat) +/- 0.2(syst)] x
10(-7) and a pionless EFT constant of C-3S1 -> 3P1/C-0 = [-7.4 +/-
3.5(stat) +/- 0.5(syst)] x 10(-11) MeV-1. We describe the experiment,
data analysis, systematic uncertainties, and implications of the result.
Filiaciones:
Blyth, D.:
Arizona State Univ, Tempe, AZ 85287 USA
Argonne Natl Lab, High Energy Phys Div, Argonne, IL 60439 USA
Fry, J.:
Univ Virginia, Charlottesville, VA 22904 USA
Indiana Univ, Bloomington, IN 47405 USA
Fomin, N.:
Univ Tennessee, Knoxville, TN 37996 USA
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Alarcon, R.:
Arizona State Univ, Tempe, AZ 85287 USA
Alonzi, L.:
Univ Virginia, Charlottesville, VA 22904 USA
Askanazi, E.:
Univ Virginia, Charlottesville, VA 22904 USA
Baessler, S.:
Univ Virginia, Charlottesville, VA 22904 USA
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Balascuta, S.:
Arizona State Univ, Tempe, AZ 85287 USA
Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest 077125, Romania
Barron-Palos, L.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Barzilov, A.:
Univ Nevada, Las Vegas, NV 89154 USA
Bowman, J. D.:
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Birge, N.:
Univ Tennessee, Knoxville, TN 37996 USA
Calarco, J. R.:
Univ New Hampshire, Durham, NH 03824 USA
Chupp, T. E.:
Univ Michigan, Ann Arbor, MI 48109 USA
Cianciolo, V.:
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Coppola, C. E.:
Univ Tennessee, Knoxville, TN 37996 USA
Crawford, C. B.:
Univ Kentucky, Lexington, KY 40506 USA
Craycraft, K.:
Univ Tennessee, Knoxville, TN 37996 USA
Univ Kentucky, Lexington, KY 40506 USA
Evans, D.:
Univ Virginia, Charlottesville, VA 22904 USA
Indiana Univ, Bloomington, IN 47405 USA
Fieseler, C.:
Univ Kentucky, Lexington, KY 40506 USA
Frlez, E.:
Univ Virginia, Charlottesville, VA 22904 USA
Garishvili, I.:
Univ Tennessee, Knoxville, TN 37996 USA
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Gericke, M. T. W.:
Univ Manitoba, Winnipeg, MB R3T 2N2, Canada
Gillis, R. C.:
Indiana Univ, Bloomington, IN 47405 USA
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Grammer, K. B.:
Univ Tennessee, Knoxville, TN 37996 USA
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Greene, G. L.:
Univ Tennessee, Knoxville, TN 37996 USA
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Hall, J.:
Univ Virginia, Charlottesville, VA 22904 USA
Hamblen, J.:
Univ Tennessee, Chattanooga, TN 37403 USA
Hayes, C.:
Univ Tennessee, Knoxville, TN 37996 USA
North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA
Iverson, E. B.:
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Kabir, M. L.:
Univ Kentucky, Lexington, KY 40506 USA
Mississippi State Univ, Mississippi State, MS 39759 USA
Kucuker, S.:
Univ Tennessee, Knoxville, TN 37996 USA
Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
Lauss, B.:
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Mahurin, R.:
Middle Tennessee State Univ, Murfreesboro, TN 37132 USA
McCrea, M.:
Univ Kentucky, Lexington, KY 40506 USA
Univ Manitoba, Winnipeg, MB R3T 2N2, Canada
Maldonado-Velazquez, M.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Masuda, Y.:
High Energy Accelerator Res Org KEK, Tsukuba 3050801, Japan
Mei, J.:
Indiana Univ, Bloomington, IN 47405 USA
Milburn, R.:
Univ Kentucky, Lexington, KY 40506 USA
Mueller, P. E.:
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Musgrave, M.:
Univ Tennessee, Knoxville, TN 37996 USA
MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA
Nann, H.:
Indiana Univ, Bloomington, IN 47405 USA
Novikov, I.:
Western Kentucky Univ, Bowling Green, KY 42101 USA
Parsons, D.:
Univ Tennessee, Chattanooga, TN 37403 USA
Penttila, S. I.:
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Pocanic, D.:
Univ Virginia, Charlottesville, VA 22904 USA
Ramirez-Morales, A.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Root, M.:
Univ Virginia, Charlottesville, VA 22904 USA
Salas-Bacci, A.:
Univ Virginia, Charlottesville, VA 22904 USA
Santra, S.:
Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India
Schroeder, S.:
Univ Virginia, Charlottesville, VA 22904 USA
Univ Saarland, Inst Expt Ophthalmol, Kirrberger Str 100,Bldg 22, D-66424 Homburg, Germany
Scott, E.:
Univ Tennessee, Knoxville, TN 37996 USA
Seo, P. -N.:
Univ Virginia, Charlottesville, VA 22904 USA
Triangle Univ Nucl Lab, Durham, NC 27708 USA
Sharapov, E. I.:
Joint Inst Nucl Res, Dubna 141980, Russia
Simmons, F.:
Univ Kentucky, Lexington, KY 40506 USA
Snow, W. M.:
Indiana Univ, Bloomington, IN 47405 USA
Sprow, A.:
Univ Kentucky, Lexington, KY 40506 USA
Stewart, J.:
Univ Tennessee, Chattanooga, TN 37403 USA
Tang, E.:
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Univ Kentucky, Lexington, KY 40506 USA
Tang, Z.:
Indiana Univ, Bloomington, IN 47405 USA
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Tong, X.:
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
Turkoglu, D. J.:
Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA
Whitehead, R.:
Univ Tennessee, Knoxville, TN 37996 USA
Wilburn, W. S.:
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
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