Ernest F. Plechaty

Measurements and calculations of the leakage multiplication from hollow beryllium spheres

Using the Pulsed-Sphere Method, the leakage spectra from hollow Be spheres of 4.5, 13.8 and 19.9 cm thickness have been measured. The predicted copious production of epithermal and thermal neutrons from the 13.8 and 19.9 cm spherical shells has been verified. A quantitative comparison of measured and calculated time-of-arrival count spectra over the energy range from thermal to ..integral.. 15 MeV indicates that the ENDL-84 library overestimates the leakage spectra between 2 and 10 MeV and in the epithermal and thermal energy regions. In the remaining regions, the leakage spectra are underestimated. Because of the above compensation the inferred leakage multiplication for the 19.9 cm Be is ..integral.. 3% higher than calculations. In the case of the 13.8 cm Be, the compensation is less exact and the inferred leakage multiplication is ..integral.. 9% higher than calculations.

The All Particle Monte Carlo Method: 1990 Status Report

Abstract Development of the All Particle Method, a project to simulate the transport of particles via the Monte Carlo method, has proceeded on two fronts: data collection and algorithm development. In this paper we report on the status of both these aspects. The data collection is nearly complete with the addition of electron and atomic data libraries and a newly revised photon library to the existing neutron and charged particle libraries. We describe the basic organization of the Monte Carlo computer code that will actually perform the simulation. Algorithm development has proceeded less quickly than the data portion of the project. The new Response Matrix Monte Carlo method is summarized and some numerical results presented.