Recent Advances in Modeling Fission Cross Sections Over Intermediate Structures

Download or read book Recent Advances in Modeling Fission Cross Sections Over Intermediate Structures written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: More accurate fission cross section calculations in presence of underlying intermediate structure are strongly desired. This paper recalls the common approximations used below the fission threshold and quantifies their impact. In particular, an exact expanded R-matrix Monte Carlo calculation of the intermediate structure, deeply mixed with the fluctuations of the class-I and II decay amplitudes, is shown. This paper also insists on the microscopic structure of the level densities as a function of the nucleus deformation and show preliminary neutron induced fission cross section calculations for 239Pu and 24°Pu using newly calculated combinatorial level densities. Comparisons with recent evaluated and measured fission cross sections are made.