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Title: RECENT DEVELOPMENTS OF THE CASCADE-EXCITON MODEL OF NUCLEAR REACTIONS

Abstract

No abstract prepared.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
786711
Report Number(s):
LA-UR-01-5390
TRN: US0111289
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Sep 2001
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; EXCITONS; NUCLEAR CASCADES; NUCLEAR MODELS

Citation Formats

S. G. MASHNIK, and A. J. SIERK. RECENT DEVELOPMENTS OF THE CASCADE-EXCITON MODEL OF NUCLEAR REACTIONS. United States: N. p., 2001. Web.
S. G. MASHNIK, & A. J. SIERK. RECENT DEVELOPMENTS OF THE CASCADE-EXCITON MODEL OF NUCLEAR REACTIONS. United States.
S. G. MASHNIK, and A. J. SIERK. Sat . "RECENT DEVELOPMENTS OF THE CASCADE-EXCITON MODEL OF NUCLEAR REACTIONS". United States. doi:. https://www.osti.gov/servlets/purl/786711.
@article{osti_786711,
title = {RECENT DEVELOPMENTS OF THE CASCADE-EXCITON MODEL OF NUCLEAR REACTIONS},
author = {S. G. MASHNIK and A. J. SIERK},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 2001},
month = {Sat Sep 01 00:00:00 EDT 2001}
}

Conference:
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  • Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions are described. The improved cascade-exciton model as implemented in the code CEM97 differs from the CEM95 version by incorporating new approximations for the elementary cross sections used in the cascade, using more precise values for nuclear masses and pairing energies, using corrected systematics for the level-density parameters, and several other refinements. We have improved algorithms used in many subroutines, decreasing the computing time by up to a factor of 6 for heavy targets. We describe a number of further improvements and changes to CEM97, motivated by new data on isotopemore » production measured at GSI. This leads us to CEM2k, 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 ATW spallation targets. The increased accuracy and predictive power of the code CEM2k are shown by several examples. Further necessary work is outlined. KEYWORDS: Intranuclear cascade, preequilibrium, evaporation, and fission reactions, Monte Carlo simulations, cascade-exciton model, particle spectra, spallation and fission cross sections, GSI data« less
  • The main assumptions of our Cascade-Exciton Model of nuclear reactions are given. A large variety of nucleon-, pion-, and {gamma}-induced reactions in the bombarding energy range of 0-3000 MeV have been analyzed and evaluated with it. It is shown that the model adequately describes nuclear reactions at intermediate energies, has one of the best predictive powers as compared to other available modern models, and may be used for evaluation of medium energy nuclear data for science and applications.
  • The continuous spectra of ..cap alpha.. particles emitted in proton induced reactions have been measured and analyzed in the framework of the Excition Model. A justification of this approach is attempted on the basis of a calculation of p-..cap alpha.. scattering in nuclear matter. 3 references.
  • A brief description of our improvements and refinements that led from the CEM95 version of the Cascade-Exciton Model (CEM) code to CEM97 and to CEM2k is given. The increased accuracy and predictive power of the code CEM2k are shown by several examples. To describe fission and light-fragment (heavier than {sup 4}He) production, the CEM2k code has been merged with the GEM2 code of Furihata. We present some results on proton-induced fragmentation and fission reactios predicted by this extended version of CEM2k. We show that merging CEM2k with GEM2 allows us to describe many fission and fragmentation reactions in addition tomore » the spallation reactions which are already relatively well described.« less