Neutron Scattering Angular Distributions for ^159Tb at 570 keV and at 1000 keV
Abstract
Neutron elastic and inelastic scattering angular distributions for ^159Tb were measured via the time-of-flight (TOF) technique with incident neutron energies of 570 keV and 1000 keV. Measurements were made at 11 angles from 35^0 to 135^0 in 10-degree steps. Neutrons were generated by the^7Li(p,n)^7Be reaction at the UML Van de Graaff accelerator laboratory, with a pulsed proton beam, Mobley compressed to around 0.5 ns, irradiating a 15-keV thick metallic Li target. The time resolution of the accelerator was controlled by monitoring the width of the prompt target gamma-ray peak in a TOF spectrum with a fast scintillation detector. The terbium scatterer was disk shaped with a thickness of 0.6 cm and a diameter of 3.8 cm. Neutrons were detected by a 0.6-cm thick plastic scintillator. The relative efficiency of the detector was determined by comparison to a calibrated ^235U fission chamber. Measured cross sections are compared with previous work, ENDF/B-VI, JENDL, and JEF.
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 2000
- Bibcode:
- 2000APS..DNP.JG008S