Cross section of the 197Au(n,2n)196Au reaction

摘要

The 197Au(n,2n)196Au reaction cross section has been measured at two energies, namely at 17.1?MeV and 20.9?MeV, by means of the activation technique, relative to the 27Al(n,α)24Na reference reaction cross section. Quasi-monoenergetic neutron beams were produced at the 5.5?MV Tandem T11/25 accelerator laboratory of NCSR “Demokritos”, by means of the 3H(d,n)4He reaction, implementing a new Ti-tritiated target of?～?400?GBq activity. The induced γ-ray activity at the targets and reference foils has been measured with HPGe detectors. The cross section for the population of the second isomeric (12?) state m2 of 196Au was independently determined. Auxiliary Monte Carlo simulations were performed using the MCNP code. The present results are in agreement with previous experimental data and with theoretical calculations of the measured reaction cross sections, which were carried out with the use of the EMPIRE code.