Measurement of integral cross sections of some neutron induced reactions on rubidium at a TRIGA reactor: comparison with integrated data from evaluated data libraries

Abstract Spectrum-averaged cross sections of the reactions 85 Rb(n,α) 82xm + g Br, 85 Rb(n,2n) 84xm + g Rb and 85 Rb(n,p) 85m Kr were measured over the fast neutron spectrum with neutron energies from 0.5 to 20 MeV of a TRIGA reactor. In addition, data for the well-investigated reactions 113 In(n,n´) 113m In and 115 In(n,n´) 115m In were re-measured to confirm the validity of the neutron spectrum and the experimental techniques. The new results of the present measurements were used to perform integral tests of evaluated excitation functions in the latest nuclear data libraries, including ENDF/B-VIII.1, JEFF-3.3, JEFF-3.1/A, JENDL-5, IRDF-1.05, and TENDL-2023. The experimental data generally agree with the integrated values from the excitation functions within 8 %, with a few exceptions. For the reaction 85 Rb(n,2n) 84xm + g Rb, the integrated value from the ENDF/B-VIII.1 library is higher by 17 % than the measured integral value. The JEFF-3.1/A and JENDL-5 libraries for the reaction 85 Rb(n,p) 85m Kr appear to require improvement.