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in creator/contributor: "Little, R C"

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Coupled proton/neutron transport calculations using the S sub N and Monte Carlo methods

Coupled charged/neutral article transport calculations are most often carried out using the Monte Carol technique. For example, the ITS, EGS, and MCNP (Version 4) codes are used extensively for electron/photon transport calculations while HETC models the transport of protons, neutrons and heavy ions. In recent years there has been considerable progress in deterministic models of electron transport, and many of these models are applicable to protons. However, even with these new models (and the … more

Date: January 1, 1991

Creator: Filippone, W. L. (Arizona Univ., Tucson, AZ (USA). Dept. of Nuclear and Energy Engineering); Little, R. C.; Morel, J. E.; MacFarlane, R. E. & Young, P. G. (Los Alamos National Lab., NM (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of the MCNP{trademark}/LCS{trademark} merger project

The MCNPX code is now in limited release in a beta-test version. We provide a brief status report on the physics modules now in the code and of the enhanced capabilities to use new evaluated neutron data. We also present new benchmark calculations in which LAHET and MCNPX are compared with experimental results from the Japan Atomic Energy Research Institute.

Date: April 19, 1998

Creator: Hughes, H. G.; Adams, K. J.; Chadwick, M. B.; Comly, J. C.; Frankle, S. C.; Hendricks, J. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

AFCI-2.0 Library of Neutron Cross Section Covariances

Neutron cross section covariance library has been under development by BNL-LANL collaborative effort over the last three years. The primary purpose of the library is to provide covariances for the Advanced Fuel Cycle Initiative (AFCI) data adjustment project, which is focusing on the needs of fast advanced burner reactors. The covariances refer to central values given in the 2006 release of the U.S. neutron evaluated library ENDF/B-VII. The preliminary version (AFCI-2.0beta) has been completed … more

Date: June 26, 2011

Creator: Herman, M.; Herman, M.; Oblozinsky, P.; Mattoon, C.; Pigni, M.; Hoblit, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transport data libraries for incident proton and neutron energies to 100 MeV

A joint effort between the Applied Nuclear Science and Radiation Transport groups at Los Alamos has begun to develop and implement proton, neutron, and photon transport libraries for incident energies up to 100 MeV. The major steps involved in this effort are: (1) development of evaluated (ENDF/B) data formats appropriate for higher energies; (2) extension of low-energy nuclear physics theoretical models for applicability up to 100 MeV; (3) calculation and evaluation of nuclear data in ENDF/B-V… more

Date: January 1, 1989

Creator: Young, P. G.; Arthur, E. D.; Bozoian, M.; England, T. R.; Hale, G. M.; LaBauve, R. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

AFCI-2.0 Neutron Cross Section Covariance Library

The cross section covariance library has been under development by BNL-LANL collaborative effort over the last three years. The project builds on two covariance libraries developed earlier, with considerable input from BNL and LANL. In 2006, international effort under WPEC Subgroup 26 produced BOLNA covariance library by putting together data, often preliminary, from various sources for most important materials for nuclear reactor technology. This was followed in 2007 by collaborative effort of… more

Date: March 1, 2011

Creator: Herman, M.; Oblozinsky, P.; Mattoon, C. M.; Pigni, M.; Hoblit, S.; Mughabghab, S. F. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evidence of water ice near the lunar poles

Lunar Prospector epithermal neutron data were studied to evaluate the probable chemical state of enhanced hydrogen, [H], reported previously to be near both lunar poles [1,2]. Improved versions of thermal and epithermal neutron data were developed for this purpose. Most important is the improved spatial resolution obtained by using shortened integration times. A new data set was created, Epi* = [Epithermal - 0.057 x Thermal], to reduce effects of composition variations other than those due to h… more

Date: January 1, 2001

Creator: Feldman, W. C. (William C.); Maurice, S. (Sylvestre); Lawrence, David J. (David Jeffery),; Little, R. C. (Robert C.); Lawrence, S. L. (Stefanie L.); Gasnault, O. M. (Olivier M.) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

We describe the next generation general purpose Evaluated Nuclear Data File, ENDF/B-VII.0, of recommended nuclear data for advanced nuclear science and technology applications. The library, released by the U.S. Cross Section Evaluation Working Group (CSEWG) in December 2006, contains data primarily for reactions with incident neutrons, protons, and photons on almost 400 isotopes. The new evaluations are based on both experimental data and nuclear reaction theory predictions. The principal advan… more

Date: October 2, 2006

Creator: Chadwick, M. B.; Oblozinsky, P.; Herman, M.; Greene, N. M.; McKnight, R. D.; Smith, D. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department