Bayesian updating for data adjustments and multi-level uncertainty propagation within Total Monte Carlo

Alhassan, E.Paul Scherrer Inst, Lab Reactor Phys & Thermal Hydraul, CH-5232 Villigen, Switzerland (författare)

In this work, a method is proposed for combining differential and integral benchmark experimental data within a Bayesian framework for nuclear data adjustments and multi-level uncertainty propagation, using the Total Monte Carlo method. First, input parameters to basic nuclear physics models implemented within the TALYS code, were randomly varied to produce a large set of random nuclear data files. Next, a probabilistic data assimilation was carried out by computing the likelihood function for each random nuclear data file based first on only differential experimental data and then on integral benchmark data. The individual likelihood functions from the two updates were then combined into a global likelihood function. The proposed method was applied for the adjustment of n+Pb-208 in the fast energy region below 20 MeV. The adjusted file was compared with available experimental data as well as evaluations from the major nuclear data libraries and found to compare favourably.

Rochman, D.Paul Scherrer Inst, Lab Reactor Phys & Thermal Hydraul, CH-5232 Villigen, Switzerland (författare)
Sjöstrand, Henrik,1978-Uppsala universitet,Tillämpad kärnfysik,U(Swepub:uu)hesjo677 (författare)
Vasiliev, A.Paul Scherrer Inst, Lab Reactor Phys & Thermal Hydraul, CH-5232 Villigen, Switzerland (författare)
Koning, ArjanUppsala universitet,Tillämpad kärnfysik(Swepub:uu)arjko970 (författare)
Ferroukhi, H.Paul Scherrer Inst, Lab Reactor Phys & Thermal Hydraul, CH-5232 Villigen, Switzerland (författare)
Paul Scherrer Inst, Lab Reactor Phys & Thermal Hydraul, CH-5232 Villigen, SwitzerlandTillämpad kärnfysik (creator_code:org_t)

Ingår i:Annals of Nuclear Energy: PERGAMON-ELSEVIER SCIENCE LTD1390306-45491873-2100

Av författaren/redakt...: Alhassan, E.; Rochman, D.; Sjöstrand, Henri ...; Vasiliev, A.; Koning, Arjan; Ferroukhi, H.

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