Energy dependence of proton induced fission cross sections for heavy nuclei in the energy range 200–1000 MeV

Fission induced by nucleons at intermediate energies

“…The rationale behind our work is to adjust fission model parameters on the (p, f ) cross sections of Ref. [5] for nat P b, 209 Bi, 232 T h, 233,235,238 U and 239 P u and use similar parameter values in computing (n, f ) cross sections for the same targets. As alredy pointed out in our preliminary work [35], the GEM-INI++ and ABLA07 models can produce fits of comparable accuracy for actinides, while in the lead-bismuth region ABLA07 appears to work better than GEMINI++.…”

“…The experiment of Ref. [5], labelled as Kotov 2006 in the figures, yields 9 cross section values in the energy range from 207 MeV to 1 GeV. We have evaluated the quality of our fits by means of a χ 2 test, where the χ 2 variable is defined as…”

“…, by adjusting 2 parameters, the relevant χ 2 distribution, f ν (χ 2 ), should have ν = 9-2 degrees of freedom and the quality of fit is evaluated by means of the cumulative probability Table 1 shows the values of the parameters adjusted on the experimental (p, f ) data of Ref. [5] for actinides in our INCL++/GEMINI++ calculations, i. e. the ratio of the level density parameter at the saddle point to the one at ground-state deformation,ã f /ã n , and the global correction of the liquid-drop fission barriers, ∆B f , in MeV.…”

“…Among the recent (p, f ) experiments a prominent role is played by Kotov et al [5], who give the cross sections tabulated in steps of 100 MeV in the range from 200 MeV to 1 GeV for several actinides very important for applications, 232 T h, 233,235,238 U , 237 N p and 239 P u, and for two pre-actinides, nat P b and 209 Bi, forming the eutectic system acting as a spallation target and as a coolant in an accelerator driven system.…”

Time resolution measurement of avalanche counters using digital signal processing technique

“…These detectors are frequently used in combination with other detectors such as drift chambers, Bragg ionization chambers or solid-state detectors for building multi-parameter detection systems (Tserruya et al, 1982;Kotov et al, 1999;Barbui et al, 2007;Beghini et al, 2005). PPACs are also the standard choice for detection of fission fragments in the fission experiments (see Nishio et al, 1997;Kotov et al, 2006;Bredeweg et al, 2007).…”