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The HMS-ALICE/ALICE codes address the question: What happens when photons,nucleons or clusters/heavy ions of a few 100 kV to several 100 MeV interact with nuclei? The ALICE codes (as they have evolved over 50 years) use several nuclear reaction models to answer this question, predicting the energies and angles of particles emitted (n,p,2H,3H,3He,4He,6Li) in the reaction, and the residues, the spallation and fission products.
Models used are principally Monte-Carlo formulations of the Hybrid/Geometry Dependent Hybrid precompound, Weisskopf-Ewing evaporation, Bohr Wheeler fission, and recently a Fermi stastics break-up model( for light nuclei). Angular distribution calculation relies on the Chadwick-Oblozinsky linear momentum conservation model.
Output gives residual product yields, and single and double differential cross sections for ejectiles in lab and CM frames. An option allows 1-3 particle out exclusive (ENDF format) for all combinations of n,p,alpha channels. Product yields include estimates of isomer yields where isomers exist. Earlier versions included the ability to compute coincident particle emission correlations, and much of this coding is still in place. Recoil product ddcs are computed, but not presently written to output files. Code execution begins with an on-screen interrogation for input, with defaults available for many aspects. A menu of model options is available within the input interrogation screen. The input is saved to hard drive. Subsequent runs may use this file, use the file with line editor changes, or begin again with the on-line interrogation.
The models listed above, and many others (e.g. optical model, various level density models, experimental masses, levels, spins, nuclear mass models....) are used in a histogram Monte Carlo calculation where the width of histogram is an input option (default 0.5 MeV) in implementing the models above beginning with precompound decay, ending with evaporation/fission or Fermi decay. Models used are described and referenced in the USER MANUAL. There are many options a user may select-or accept defaults for a very simple input; options include level density models, angular momentum treatment, variety of clusters emitted, and others as given in the menu.
Excitation energies for interacting projectile/target systems may go from 0.1 MeV to 1 GeV, but lack of pion channels imply that per nucleon projectile energies above 200 MeV carry an uncertainty due to missing pion physics. In the present revision of ALICE2017, apportionment of events according to incident angular momentum has been changed from a deterministic algorithm to Monte-Carlo. This permits as few as one event to be selected to run with no rounding error losses per unit of angular momentum due to algorithm.
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Special Acknowledgement: A. V. Ignatyuk, V. P. Lunev, and Yu. N. Shubin from the Institute of Physics and Power Engineering, Obninsk.
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Contributed by: Radiation Safety Information Computational Center
Oak Ridge National Laboratory
Oak Ridge, Tennessee, U. S. A.
Developed by: Lawrence Livermore National Laboratory, Livermore, California, USA
Institut f. Reaktorsicherheit, Forschungszentrum Karlsruhe, FRG, Germany
Los Alamos National Laboratory, Los Alamos, New Mexico, USA
Institute of Applied Physics,Academy of Sciences, Chisinau, Moldova
Institute of Physics and Power Engineering, Obninsk, Russia
Keywords: Monte Carlo, compound nuclei, evaporation model, nuclear models, precompound-nucleus emission.