Recent developments of the CEM2K and LAQGSM codes.

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Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions are briefly described. The improved cascade-exciton model as implemented in the code CEM97 [l] differs from the CEM95 version [4] by incorporating new approximations for the elementary cross sections used in the cascade, using more precise {approx} values for nuclear masses and pairing energies, using corrected systematics for the I level-density parameters, and several other refinements. Algorithms used in many i subroutines have been improved, decreasing the computing time by up to a factor of 6 for heavy targets. A number of further recent improvements and changes to CEM97, motivated ... continued below

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3 p.

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Mashnik, S. G. (Stepan G.); Gudima, K. K. (Konstantin K.) & Sierk, A. J. (Arnold J.) January 1, 2002.

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Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions are briefly described. The improved cascade-exciton model as implemented in the code CEM97 [l] differs from the CEM95 version [4] by incorporating new approximations for the elementary cross sections used in the cascade, using more precise {approx} values for nuclear masses and pairing energies, using corrected systematics for the I level-density parameters, and several other refinements. Algorithms used in many i subroutines have been improved, decreasing the computing time by up to a factor of 6 for heavy targets. A number of further recent improvements and changes to CEM97, motivated by new data on isotope production measured at GSI will be presented. This leads us to CEM2k [2], a new version of the CEM code. CEM2k has a longer cascade stage, less preequilibrium emission, and evaporation from more highly excited compound nuclei compared to earlier versions. CEM2k also has other improvements and allows us to better model neutron, radionuclide, and gas production in Accelerator Transmutation of nuclear Wastes (ATW) spallation targets. The improved CEM97 code was recently used both to study fundamental nuclear physics problems like the role of nuclear medium effects in transport of 7r mesons in nuclei [5] and fission processes at intermediate energies [6], and was incorporated in the well known transport code MCNPX (LANL) to solve applied problems. The CEM95 version [4] of the CEM was incorporated in the MARS (FNAL) and CALOR95 (ORNL) transport codes, and its preequilibrium part was incorporated in many other transport codes like GEANT4 (CERN, see, e.g., [7]), HETC-3STEP (JAERI), HADRON (IHEP, Protvino), CASCADE (JINR, Dubna), SONET (RPCPI, Minsk), etc. The latest version of the CEM code, CEM2k, is still under development. The increased accuracy and predictive power of the code CEM2k will be shown by several examples. Further necessary work will be outlined.

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3 p.

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  • Submitted to: 6th World Multi-Conference on Systematics, Cybernetics and Informatics, July 14-18, 2002, Orlando, FL

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  • Report No.: LA-UR-02-0305
  • Report No.: LA-UR-02-305
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975957
  • Archival Resource Key: ark:/67531/metadc928302

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  • January 1, 2002

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:57 p.m.

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Mashnik, S. G. (Stepan G.); Gudima, K. K. (Konstantin K.) & Sierk, A. J. (Arnold J.). Recent developments of the CEM2K and LAQGSM codes., article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc928302/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.