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Title: New experimental possibility to search for the ratio of a possible T-violating amplitude to the weak-interaction amplitude in polarized neutron transmission through a polarized nuclear target

Abstract

This paper considers a spin-dependent neutron interaction with optical potentials (fields) from the strong interaction, the weak interaction, and an assumed T-violating interaction. The vector sum of these fields and their interferences determines an effective field of the target with an angular position in space due to polar and azimuthal angles. The phase of the azimuthal component is found to be the sum of two angles. The tangent of the first angle is equal to the ratio of the T-violating forward-scattering amplitude D to the weak-interaction amplitude C. The quantity is of interest. The tangent of the second angle depends on the spin rotation in the residual pseudomagnetic field of the target, and it can be treated as a background effect. This paper shows that the second angle has different signs in measurements with polarized and unpolarized neutrons; thus, two measurements allow it to be compensated for. In addition, the use of the Ramsey method of separated oscillatory fields for measurement of the neutron spin rotation angle, depending on the phase of the rf field in the Ramsey cell, allows a cosine-like spectrum to be measured. This spectrum is called a phase spectrum. The phase spectra measured with polarized andmore » unpolarized targets have a phase shift. The measurements of this phase shift with polarized and nonpolarized neutrons at a p-wave resonance enable the ratio D/C to be isolated. We also describe the algorithm for separating the ratio D/C, taking into account the influence of the fringing fields of the Ramsey coil magnet and the target magnet.« less

Authors:
; ;  [1];  [2]
  1. St. Petersburg Institute of Nuclear Physics, Russian Academy of Sciences, Gatchina 188350 (Russian Federation)
  2. (Switzerland)
Publication Date:
OSTI Identifier:
21499527
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 83; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.83.035501; (c) 2011 American Institute of Physics; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALGORITHMS; INTERFERENCE; MAGNETS; NEUTRONS; OPTICAL MODELS; P WAVES; PHASE SHIFT; RESONANCE; ROTATION; SCATTERING AMPLITUDES; SPECTRA; SPIN; STRONG INTERACTIONS; TRANSMISSION; WEAK INTERACTIONS; AMPLITUDES; ANGULAR MOMENTUM; BARYONS; BASIC INTERACTIONS; ELEMENTARY PARTICLES; EQUIPMENT; FERMIONS; HADRONS; INTERACTIONS; MATHEMATICAL LOGIC; MATHEMATICAL MODELS; MOTION; NUCLEONS; PARTIAL WAVES; PARTICLE PROPERTIES

Citation Formats

Lukashevich, V. V., Aldushchenkov, A. V., Dallman, D., and CERN, Geneva. New experimental possibility to search for the ratio of a possible T-violating amplitude to the weak-interaction amplitude in polarized neutron transmission through a polarized nuclear target. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.83.035501.
Lukashevich, V. V., Aldushchenkov, A. V., Dallman, D., & CERN, Geneva. New experimental possibility to search for the ratio of a possible T-violating amplitude to the weak-interaction amplitude in polarized neutron transmission through a polarized nuclear target. United States. doi:10.1103/PHYSREVC.83.035501.
Lukashevich, V. V., Aldushchenkov, A. V., Dallman, D., and CERN, Geneva. Tue . "New experimental possibility to search for the ratio of a possible T-violating amplitude to the weak-interaction amplitude in polarized neutron transmission through a polarized nuclear target". United States. doi:10.1103/PHYSREVC.83.035501.
@article{osti_21499527,
title = {New experimental possibility to search for the ratio of a possible T-violating amplitude to the weak-interaction amplitude in polarized neutron transmission through a polarized nuclear target},
author = {Lukashevich, V. V. and Aldushchenkov, A. V. and Dallman, D. and CERN, Geneva},
abstractNote = {This paper considers a spin-dependent neutron interaction with optical potentials (fields) from the strong interaction, the weak interaction, and an assumed T-violating interaction. The vector sum of these fields and their interferences determines an effective field of the target with an angular position in space due to polar and azimuthal angles. The phase of the azimuthal component is found to be the sum of two angles. The tangent of the first angle is equal to the ratio of the T-violating forward-scattering amplitude D to the weak-interaction amplitude C. The quantity is of interest. The tangent of the second angle depends on the spin rotation in the residual pseudomagnetic field of the target, and it can be treated as a background effect. This paper shows that the second angle has different signs in measurements with polarized and unpolarized neutrons; thus, two measurements allow it to be compensated for. In addition, the use of the Ramsey method of separated oscillatory fields for measurement of the neutron spin rotation angle, depending on the phase of the rf field in the Ramsey cell, allows a cosine-like spectrum to be measured. This spectrum is called a phase spectrum. The phase spectra measured with polarized and unpolarized targets have a phase shift. The measurements of this phase shift with polarized and nonpolarized neutrons at a p-wave resonance enable the ratio D/C to be isolated. We also describe the algorithm for separating the ratio D/C, taking into account the influence of the fringing fields of the Ramsey coil magnet and the target magnet.},
doi = {10.1103/PHYSREVC.83.035501},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 83,
place = {United States},
year = {2011},
month = {3}
}