TAILIEUCHUNG - Covariance analysis for total neutron cross sections based on a microscopic optical model potential

The deterministic simple least square (LS) approach is employed in the covariance analysis of the total neutron cross section (n,tot) calculated by a microscopic optical potential, CTOM, which is based on a fundamental theory Dirac Brueckner Hartree Fock. | Covariance analysis for total neutron cross sections based on a microscopic optical model potential EPJ Nuclear Sci. Technol. 4 37 2018 Nuclear Sciences R. Xu et al. published by EDP Sciences 2018 amp Technologies https epjn 2018037 Available online at https REGULAR ARTICLE Covariance analysis for total neutron cross sections based on a microscopic optical model potential Ruirui Xu Zhigang Ge Tingjin Liu Yue Zhang Xi Tao and Zhi Zhang China Nuclear Data Center China Institute of Atomic Energy . Box 275 41 Beijing 102413 . China Received 7 December 2017 Received in final form 1 March 2018 Accepted 28 May 2018 Abstract. The deterministic simple least square LS approach is employed in the covariance analysis of the total neutron cross section n tot calculated by a microscopic optical potential CTOM which is based on a fundamental theory Dirac Brueckner Hartree Fock. The sensitivity to the CTOM parameters is firstly systematically calculated for 77 stable nuclei in the range 12C 208Pb within neutron energy 5 200 MeV. Then an equivalent covariance of experimental data EVexp is constructed to describe the experimental data uncertainties and the systematic difference between experimental data and CTOM calculation. The variance and covariance of EVexp matrix are both evaluated via the Gaussian analysis to the ratios of measured n tot cross sections and the CTOM calculations. In addition a technique named selection of effective points SEP is suggested additionally to reduce the influence of the Peelle s Pertinent Puzzle problem in this work. 1 Introduction covariance of the CTOM prediction still deserve to be further studied namely for its impact on other physics As well known covariance of cross sections make a big observable. Therefore the purpose of this article is to impact on the target accuracy design of modern nuclear further explore the covariance according to another facilities such as the reactors of Generation-IV 1 . Because .

• Năng lượng
• Deterministic simple least square
• Neutron cross section
• Microscopic optical potential
• Fundamental theory Dirac Brueckner Hartree Fock
• Dirac Brueckner Hartree Fock