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Title: Modelling Neutron-induced Reactions on 232–237U from 10 keV up to 30 MeV

Comprehensive calculations of cross sections for neutron-induced reactions on 232–237U targets are performed in this paper in the 10 keV–30 MeV incident energy range with the code EMPIRE–3.2 Malta. The advanced modelling and consistent calculation scheme are aimed at improving our knowledge of the neutron scattering and emission cross sections, and to assess the consistency of available evaluated libraries for light uranium isotopes. The reaction model considers a dispersive optical potential (RIPL 2408) that couples from five (even targets) to nine (odd targets) levels of the ground-state rotational band, and a triple-humped fission barrier with absorption in the wells described within the optical model for fission. A modified Lorentzian model (MLO) of the radiative strength function and Enhanced Generalized Superfluid Model nuclear level densities are used in Hauser-Feschbach calculations of the compound-nuclear decay that include width fluctuation corrections. The starting values for the model parameters are retrieved from RIPL. Excellent agreement with available experimental data for neutron emission and fission is achieved, giving confidence that the quantities for which there is no experimental information are also accurately predicted. Finally, deficiencies in existing evaluated libraries are highlighted.
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Univ. of Bucharest (Romania). Faculty of Physics
  2. International Atomic Energy Agency, Vienna (Austria). NAPC - Nuclear Data Section
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center
Publication Date:
Report Number(s):
BNL-113844-2017-JA
Journal ID: ISSN 0090-3752; R&D Project: 05055; 05055; KB0301042; TRN: US1702164
Grant/Contract Number:
SC0012704; FP7-605203
Type:
Accepted Manuscript
Journal Name:
Nuclear Data Sheets
Additional Journal Information:
Journal Volume: 139; Journal ID: ISSN 0090-3752
Publisher:
Elsevier
Research Org:
Univ. of Bucharest (Romania); Brookhaven National Lab. (BNL), Upton, NY (United States); International Atomic Energy Agency, Vienna (Austria)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE); European Commission (EC)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1358024