Magnetic Field Analysis and the Calculation of the Spin Flip Efficiency*

Parity Violation (PV) was first observed in weak decays of 60Co by C.S. Wu et al in 1956 and has since been observed in many other systems. The Neutron Optics Time Reversal Experiment (NOPTREX) Collaboration is attempting the most precise measurement of parity violation present in a nuclear resonance by examining the 0.734 eV resonance in 139La using a ‘double lanthanum’ technique (see Yuan et al., ref \cite{Yuan}) wherein unpolarized neutrons are incident upon two unpolarized lanthanum targets; the first target weakly polarizes the beam and the second target acts as an analyzer. Magnetic field coils were installed to both preserve the neutron polarization and to flip the neutron spin. A thorough understanding of the uncertainties in the experiment are critical to receive a precision measurement, one such value is the spin-flip efficiency. This poster will discuss the magnetic field mapping process, its subsequent analysis, and how it folds into the spin-flip efficiency calculation.

\bibitem{Yuan} Yuan, Bowman, et al., Phys. Rev. C. {\bf 44}, 2187 (1991).