We present new measurements of the analyzing power for np scattering at 10.03 MeV accurate to ± 1 x 10 ~3. A new source of systematic error, related to resonances in n-l2 C scattering in the neutron detectors, is discussed. The interaction of the neutron magnetic moment with the Coulomb field of the proton is found to make a significant contribution to the analyzing power at the present level of accuracy. The results are compared to predictions of nucleon-nucleon potential models. New, improved values are reported for the p-and t/-wave spin-orbit phase-shift splittings.
Articles you may be interested in Development of multichannel low-energy neutron spectrometera) Rev. Sci. Instrum. 85, 11E125 (2014); 10.1063/1.4895826 Light output function and assembly of the time-of-flight enhanced diagnostics neutron spectrometer plastic scintillators for background reduction by double kinematic selection at EASTa)
We report the results of recent calibration data analysis of a prototype scintillating fiber tracking detector system designed to perform imaging, spectroscopy and particle identification on 20 to 250 MeV neutrons and protons. We present the neutron imaging concept and briefly review the detection principle and the prototype description. The prototype detector system records ionization track data on an event-by-event basis allowing event selection criteria to be used in the off-line analysis. Images of acrylic phantoms from the analysis of recent proton beam calibrations (14 to 65 MeV range) are presented as demonstrations of the particle identification, imaging and energy measurement capabilities. The measured position resolution is c 500 pm. The measured energy resolution (AE/E, FWHM) is 14.2% at 35 MeV. An effective technique for track identification and data compression is presented. The detection techniques employed can be applied to measurements in a variety of disciplines including solar and atmospheric physics, radiation therapy and nuclear materials monitoring. These applications are discussed briefly as are alternative detector configurations and future development plans.
The analyzing power in neutron-proton scattering at 25 MeV neutron energy has been measured to an accuracy of typically ±0.002 for cm. scattering angles between 50° and 165°. Contrary to the conclusions reached from earlier precision measurements at 16.9 MeV, the contributions to partial waves with / > 3 are consistent with predictions based on one-pion exchange. The new data are well described by the Paris potential and by a recent global phase-shift analysis.
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