Measurements of the ²⁴³Am neutron capture and total cross sections with ANNRI at J-PARC

Abstract

Neutron total and capture cross sections of 243Am have been measured in Accurate Neutron Nucleus Reaction measurement Instrument at Materials and Life Science Experimental Facility of Japan Proton Accelerator Research Complex with a neutron time-of-flight (TOF) method. The neutron capture cross section in the energy region from 10 meV to 100 eV was determined using an array of Ge detectors. Three samples with different activities were used for measurements of the capture cross section. The neutron total cross section in the energy region from 4 meV to 100 eV was measured using Li-glass detectors. Derived cross-section value at neutron energy of 0.0253 eV is 87.7±5.4 b for the capture cross section and 101±11 b for the total cross section.