High-Energy (n,xn) Dosimetry Reactions

Full text: Bayesian computer code GLUCS (update 2006, S. Tagesen) and generalized least squares code (GMA, W. Poenitz, 1997; CSEWG, 2002; V. Pronyaev, 2004) can be used for evaluation of (n,xn) high-energy dosimetry reactions at the set of mono-isotopic natural elements. For this the results of model calculations with computer codes GNASH, TALYS and EMPIRE and covariance matrices of uncertainties obtained by experts' estimation or Monte Carlo method can be used as prior evaluations in the fit of the experimental data. The method can be verified by comparison with the results of evaluations obtained with PADE-2 method for (n,2n) and (n,3n) reactions using the same experimental data in the fit. Although the evaluated percent uncertainties of (n,xn) reaction for x > 3 may be in the range 10 - 30%, these reactions can be rather informative in the spectra unfolding because their bell or step-wise shapes. (author)