A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission
Por:
Schaper, D. C., Auton, C., Barron-Palos, L., Borrego, M., Chavez, A., Cole, L., Crawford, C. B., Curole, J., Dhahri, H., Dickerson, K. A., Doskow, J., Fox, W., Gervais, M. H., Goodson, B. M., Knickerbocker, K., Jiang, C., King, P. M., Lu, H., Mocko, M., Olivera-Velarde, D., Otero Munoz J.G., Penttila, I, S., Perez-Martin, A., Short, B., Snow, W. M., Steffen, K., Vanderwerp, J., Visser, G.
Publicada:
1 ene 2020
Resumen:
We describe a modular apparatus for use in parity-violation measurements in epithermal neutron–nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutron–nucleus resonances in the 0.1–10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a 3He-4He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency 6Li-7Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of 3He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in 139La which employs two identical 139La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization. © 2020 Elsevier B.V.
Filiaciones:
Schaper, D. C.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
University of Kentucky, LexingtonKY 40506, United States
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Univ Kentucky, Lexington, KY 40506 USA
Auton, C.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Barron-Palos, L.:
Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal20-36401000, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Borrego, M.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Chavez, A.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Cole, L.:
University of Kentucky, LexingtonKY 40506, United States
Univ Kentucky, Lexington, KY 40506 USA
Crawford, C. B.:
University of Kentucky, LexingtonKY 40506, United States
Univ Kentucky, Lexington, KY 40506 USA
Curole, J.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Dhahri, H.:
University of Kentucky, LexingtonKY 40506, United States
Univ Kentucky, Lexington, KY 40506 USA
Dickerson, K. A.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Doskow, J.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Fox, W.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Gervais, M. H.:
University of Kentucky, LexingtonKY 40506, United States
Univ Kentucky, Lexington, KY 40506 USA
Goodson, B. M.:
Southern Illinois University, Carbondale, IL 62901, United States
Southern Illinois Univ, Carbondale, IL 62901 USA
Knickerbocker, K.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Jiang, C.:
Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
Penttila, S
King, P. M.:
Ohio University, Athens, OH 45701, United States
Ohio Univ, Athens, OH 45701 USA
Lu, H.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Mocko, M.:
Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Olivera-Velarde, D.:
Berea College, Berea, KY 40404, United States
Berea Coll, Berea, KY 40404 USA
Otero Munoz J.G.:
Indiana University, Bloomington, IN 47405, United States
Penttila, I, S.:
Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
Perez-Martin, A.:
Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal20-36401000, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Short, B.:
University of Minnesota Twin Cities, Minneapolis, MN 55455, United States
Univ Minnesota Twin Cities, Minneapolis, MN 55455 USA
Snow, W. M.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Steffen, K.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Vanderwerp, J.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
Visser, G.:
Indiana University, Bloomington, IN 47405, United States
Indiana Univ, Bloomington, IN 47405 USA
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