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Different reaction mechanisms contribute to the production of light fragments (LF) from nuclear reactions. Available models cannot accurately predict emission of LF from arbitrary reactions. However, the emission of LF is important for many…

Nuclear Theory · Physics 2015-06-16 Stepan G. Mashnik , Leslie M. Kerby , Konstantin K. Gudima , Arnold J. Sierk

The ability to describe production of light fragments (LF) is important for many applications, such as cosmic-ray-induced single event upsets (SEUs), radiation protection, and cancer therapy with proton and heavy-ion beams. The…

Nuclear Theory · Physics 2013-03-19 Leslie M. Kerby , Stepan G. Mashnik , Arnold J. Sierk

We extend the cascade-exciton model (CEM), and the Los Alamos version of the quark-gluon string model (LAQGSM), event generators of the Monte-Carlo N-particle transport code version 6 (MCNP6), to describe production of energetic light…

An improved version of the Cascade-Exciton Model (CEM) of nuclear reactions realized in the code CEM2k and the Los Alamos version of the Quark-Gluon String Model (LAQGSM) have been developed recently at LANL to describe reactions induced by…

Nuclear Theory · Physics 2009-11-11 S. G. Mashnik , A. J. Sierk , K. K. Gudima , M. I. Baznat

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…

Nuclear Theory · Physics 2007-05-23 Stepan G. Mashnik , Arnold J. Sierk , Konstantin K. Gudima

Fragmentation reactions induced on light target nuclei by protons and light nuclei of energies around 1 GeV/nucleon and below are studied with the latest Los Alamos Monte Carlo transport code MCNP6 and with its cascade-exciton model (CEM)…

Nuclear Theory · Physics 2015-06-19 Stepan G. Mashnik , Leslie M. Kerby

The production of heavy clusters in nuclear reactions is important in a wide variety of applications: radiation shielding, space engineering and design, medical physics, accelerator design, and more. According to the Cascade Exciton Model…

Nuclear Theory · Physics 2015-03-03 Leslie M. Kerby , Stepan G. Mashnik

An improved version of the Cascade-Exciton Model (CEM) of nuclear reactions implemented in the codes CEM2k and the Los Alamos version of the Quark-Gluon String Model (LAQGSM) has been developed recently at LANL to describe reactions induced…

Nuclear Theory · Physics 2009-11-11 S. G. Mashnik , K. K. Gudima , A. J. Sierk , R. E. Prael

Fragmentation reactions induced on light and medium nuclei by protons and light nuclei of energies around 1 GeV/nucleon and below are studied with the Los Alamos transport code MCNP6 and with its CEM03.03 and LAQGSM03.03 event generators.…

Nuclear Theory · Physics 2016-06-22 Stepan G. Mashnik , Leslie M. Kerby

We present the current status of the improved Cascade-Exciton Model (CEM) code CEM2k and of the Los Alamos version of the Quark-Gluon String Model code LAQGSM. To describe fission and light-fragment (heavier than He4) production, both CEM2k…

Nuclear Theory · Physics 2007-05-23 Stepan G. Mashnik , Konstantin K. Gudima , Arnold J. Sierk

Recent improvements to the Cascade-Exciton Model (CEM) of nuclear reactions are briefly described. They concern mainly the cascade stage of reactions and a better description of nuclei during the preequilibrium and evaporation stages of…

Nuclear Theory · Physics 2007-05-23 Stepan G. Mashnik , Arnold J. Sierk

The goal of this research is to enable MCNP6 to produce high-energy light fragments. These energetic light fragments may be emitted by our models through three processes: Fermi breakup, preequilibrium, and coalescence. We explore the…

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…

Nuclear Theory · Physics 2010-05-27 Stepan G. Mashnik , Arnold J. Sierk

The improved Cascade-Exciton Model (CEM) code CEM2k+GEM2 and the Los Alamos version of the Quark-Gluon String Model code LAQGSM are extended to describe photonuclear reactions. First, we incorporate into CEM2k+GEM2 new evaluations of…

Nuclear Theory · Physics 2007-05-23 S. G. Mashnik , M. I. Baznat , K. K. Gudima , A. J. Sierk , R. E. Prael

An improved version of the Cascade-Exciton Model (CEM) of nuclear reactions contained in the code CEM2k and the Los Alamos version of the Quark-Gluon String Model (LAQGSM) are merged with the well-known sequential-binary-decay model GEMINI…

Nuclear Theory · Physics 2009-11-11 M. I. Baznat , S. G. Mashnik , K. K. Gudima , R. E. Prael

A description of the IntraNuclear Cascade (INC), preequilibrium, evaporation, fission, coalescence, and Fermi breakup models used by the latest versions of our CEM03.03 and LAQGSM03.03 event generators is presented, with a focus on our most…

Nuclear Theory · Physics 2010-11-03 S. G. Mashnik , K. K. Gudima , R. E. Prael , A. J. Sierk , M. I. Baznat , N. V. Mokhov

A brief description of the IntraNuclear cascade, preequilibrium, evaporation, fission, coalescence, and Fermi breakup models used by the last versions of our CEM and LAQGSM event generators is presented, with a focus on our latest…

Nuclear Theory · Physics 2008-12-12 Stepan G. Mashnik

The LAQGSM code has been recently developed at Los Alamos National Laboratory to simulate nuclear reactions for proton radiography applications. We have benchmarked our code against most available measured data both for proton-nucleus and…

Nuclear Theory · Physics 2007-05-23 S. G. Mashnik , K. K. Gudima , R. E. Prael , A. J. Sierk

The CEM2k and LAQGSM codes have been recently developed at Los Alamos National Laboratory to simulate nuclear reactions for a number of applications. We have benchmarked our codes against most available measured data at incident particle…

Nuclear Theory · Physics 2009-11-07 S. G. Mashnik , K. K. Gudima , I. V. Moskalenko , R. E. Prael , A. J. Sierk

Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions to describe high energy particle induced fission are briefly described. The increased accuracy and predictive power of the CEM are shown by several examples.…

Nuclear Theory · Physics 2007-05-23 Arnold J. Sierk , Stepan G. Mashnik
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