Journal of radioanalytical and nuclear chemistry vol:272 issue:2 pages:223-226
The measurement of the cross section of the reaction Am-241(n,2n)Am-240 has been performed at neutron energies from 8.8 to 11.1 MeV, implementing the activation technique. The neutron beam was produced at the TANDEM accelerator of NCSR "Demokritos" by the H-2(d,n)He-3 reaction, using a deuterium gas target. During the 5-day long irradiation, the neutron beam fluctuations were monitored in 100 seconds intervals by a BF3 counter connected with a multiscaling unit. The radioactive target consisted of a 37 GBq Am-241 source enclosed in a Pb container. A natural Au foil, a Al-27 foil and a Nb-93 foil were used as reference materials for the neutron flux determination. After the end of the irradiation the activity induced at the target and the reference foils, was measured off-line by a 56% HPGe detector.