Nucleon-induced fission cross sections of tantalum and separated tungsten isotopes and "compound nucleus" effect in intermediate energy regionA.N. Smirnov1, O.I. Batenkov1, V.P. Eismont1, N.P. Filatov1, J. Blomgren2, H. Condé2, A.V. Prokofiev3 and S.G. Mashnik4
1 V.G. Khlopin Radium Institute, 2-nd Murinskiy prospect 28, Saint-Petersburg 194021, Russia
2 Department of Neutron Research, Uppsala University, Box 525, 751 20 Uppsala, Sweden
3 The Svedberg Laboratory, Uppsala University, Box 533, 751 21 Uppsala, Sweden
4 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Published online: 21 May 2008
Neutron- and proton-induced fission cross sections of separated isotopes of tungsten (182W, 183W, 184W, and 186W) and 181Ta relative to 209Bi have been measured in the incident nucleon energy region 50--200 MeV using fission chambers based on thin-film breakdown counters (TFBC) using quasi-monoenergetic neutrons from the 7Li(p,n) reaction and at the proton beams of The Svedberg Laboratory (TSL), Uppsala University (Uppsala, Sweden). The results are compared with predictions by the CEM03.01 event generator, as well as with the recent data for nuclei in the lead-bismuth region. The effect of ``compound nucleus'' in the intermediate energy region is discussed, displaying in exponential dependence of nucleon-induced fission cross sections on the parameter Z2/A of the composite system (projectile+target nucleus), and in other characteristics of the fission process for which parameter Z2/A plays a role similar to the one of the usual liquid-drop parameter Z2/A of compound nuclei.
© CEA 2008