The (n, 2n) cross sections of 85Rb, 87Rb and 144Sm

Abstract

The (n, 2n) cross sections at neutron energies between 14.9 and 17.0 MeV have been measured for 85Rb, 87Rb and 144Sm by the mixed-powder method and γ-ray detection by a Ge(Li) spectrometer. Using the 27Al(n, α) 24Na reaction for monitoring, the measured cross sections were (in mb): 85 Rb( n, 2 n) 84( m+g) Rb, 1125±141, 1177±148 and 1235±162 at 15.0±0.4 MeV, 16.2±0.7 MeV and 17.0±0.9 MeV, respectively; 85 Rb( n, 2 n) 84 m Rb, 662±83, 688±87 and 765±99 at 15.0±0.4 MeV, 16.2±0.7 MeV and 17.0±0.9 MeV, respectively; 87 Rb( n, 2 n) 86( m+g) Rb, 1336±168 and 1301±162 at 15.0±0.4 MeV and 16.2±0.7 MeV respectively; 144 Sm( n, 2 n) 143( m+g) Sm, 1202±130, 1300±141, 1516±179 and 1514±179 at 14.9±0.3 MeV, 15.5±0.3 MeV, 16.4±0.5 MeV and 16.7±0.2 MeV, respectively . The measured values are compared with the statistical model calculations of Pearlstein.