Fission Cross Sections and Fission-Fragment Mass Yields via the Surrogate Reaction Method

Abstract

International audienc

Compound-nuclear reaction cross sections from surrogate measurements

“…Originally introduced in the 1970s (Cramer and Britt, 1970a;Britt and Wilhelmy, 1979), the surrogate approach has recently received renewed attention (Younes and Britt, 2003b;2003c;Petit et al, 2004;Boyer et al, 2006;Burke et al, 2006;Escher and Dietrich, 2006;Escher et al, 2007;Jurado et al, 2008;Escher and Dietrich, 2010;Kessedjian et al, 2010). A sizable number of surrogate experiments aimed at obtaining ðn; fÞ cross sections has been carried out over the years, and recent efforts have also considered ðn; Þ cross sections.…”

Compound-Nuclear Reaction Cross Sections from Surrogate Measurements: Status and Challenges

“…Discrepancies at lower energies were attributed to large uncertainties in the low-energy optical model employed, and the use of the Weisskopf-Ewing approximation. More recently, the CENBG collaboration carried out Surrogate experiments to determine cross sections for neutroninduced reactions on several minor actinide nuclei relevant to the thorium-uranium fuel cycle and the transmutation of nuclear waste [9,12,25]. The transfer reactions 232 Th( 3 He,x) and 243 Am( 3 He,x), with x=α,t,d,p, were employed to obtain (n,f) and (n,γ) cross sections for Th and Pa targets [9,12] and (n,f) cross sections for Cm and Am targets [25], respectively.…”

“…More recently, the CENBG collaboration carried out Surrogate experiments to determine cross sections for neutroninduced reactions on several minor actinide nuclei relevant to the thorium-uranium fuel cycle and the transmutation of nuclear waste [9,12,25]. The transfer reactions 232 Th( 3 He,x) and 243 Am( 3 He,x), with x=α,t,d,p, were employed to obtain (n,f) and (n,γ) cross sections for Th and Pa targets [9,12] and (n,f) cross sections for Cm and Am targets [25], respectively. The STARS/LiBerACE collaboration employed the Weisskopf-Ewing approximation to determine the 237 Np(n,f) cross section, for neutron energies between 10 and 20 MeV, from a Surrogate measurement of the 238 U( 3 He,t) charge exchange reaction [26].…”