A facility for measurements of (n,γ) cross-sections of a nucleus in the range 0.008≤E n<20MeV

Abstract: A new measurement system to determine the neutron-capture cross-sections of a nucleus at 0.008≤E n<20MeV has been installed at the 4MV Pelletron accelerator laboratory at the facility of radiation standards at Japan Atomic Energy Agency. The performance of the new system was studied by measuring the neutron-capture reaction cross-section of natPb using pulsed neutrons from 7Li(p,n)7Be at 12≤E n≤103keV. Prompt γ-rays from the reaction were detected by means of a highly sensitive anti-Compton NaI(Tl) spectrometer combined with a time-of-flight method. The obtained result demonstrated good sensitivity of the new system to determine the neutron-capture cross-sections of a nucleus at kiloelectron volt neutron energy. [Copyright &y& Elsevier]