Open AccessEURIPUS-3 AND DAEDALUS--MONTE CARLO DENSITY CODES FOR THE IBM-704
Author(s) -
Harvey J. Amster,
H. Kuehn,
Jerome Spanier
Publication year - 1960
Language(s) - English
Resource type - Reports
DOI - 10.2172/4184250
Subject(s) - monte carlo method , physics , computational physics , isotropy , neutron , computation , scattering , neutron source , distribution function , nuclear physics , optics , mathematics , algorithm , quantum mechanics , statistics
EURIPUS-3 calculates the one-dimensional spatial density of neutrons slowing-down past a given energy in an infinite homogeneous medium consisting of hydrogen and one other isotope with arbitrary mass and energydependent differential-elastic and absorption cross sections. DAEDALUS determines the corresponding spatial distribution of angular integrals of an arbitrary function times the vector flux density. Spatial moments of all density functions are furnished directly. Although scattering angles are calculated by Monte Carlo, the spatial distributions and, in DAEDALUS, the energy distribution are obtained partly from an analytic treatment which, besides saving tinne, enables the output to be in the form of actual density functions at specified planes and energies, rather than histograms covering finite intervals. At certain steps in the computation of both the spatial and energy distributions, part of the analytic treatment is replaced by Monte Carlo in order either to maximize efficiency and/ or to avoid round-off error. The neutron source may be monoenergetic with either isotropic or monodirectional angular distributions, or else the source may be that from deuterons bombarding deuterons. The volume displaced by a cylindrical tube from an accelerator to the source can be accounted for in the neutron first flight but not thereafter. (auth