Open Access
ND 2007
Article Number 011
Number of page(s) 7
Section Plenary Sessions
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07659

Multistep direct preequilibrium reactions and the Monte Carlo approach

M.B. Chadwick1, M. Blann2 and S. Hilaire3

1  Group X-1, Applied Science and Methods, Los Alamos National Laboratory, NM 87545, USA
2  San Diego, CA, USA
3  CEA, Bruyères-le-Châtel, France

Published online: 21 May 2008

We provide an overview of recent developments to the Hybrid Monte Carlo Simulation (HMS) model for calculating preequilibrium reactions. Illustrative examples are shown for nucleon and cluster induced reactions, and for assessing the importance of multiple preequilibrium processes. We present new results using HMS theory to study heavy nuclide recoil velocities, which are important in applications such as radiation heating, damage and single-event-upsets, and also discuss GNASH and TALYS code recoil predictions. We also discuss approaches for performing center-of-mass to laboratory kinematic transformations for the light-ejectile particles - we emphasize that correctly following the kinematics of sequentially decaying nuclei leads to results that can be quite different from those obtained using the traditional 2-body assumption for the recoil boost velocity. We also discuss how angular momentum transfer effects can be included semiclassically in the HMS model, allowing HMS to be linked to a Hauser-Feshbach code to study spin-dependent observables (such as gamma-ray, and isomer production).

© CEA 2008