Published April 1998 | Version v1
Report Restricted

New probability table treatment in MCNP for unresolved resonances

Creators

  • 1. Carter M.C. Analysis, Richland, WA (United States)
  • 2. Los Alamos National Lab., NM (United States)

Description

An upgrade for MCNP has been implemented to sample the neutron cross sections in the unresolved resonance range using probability tables. These probability tables are generated with the cross section processor code NJOY, by using the evaluated statistical information about the resonances to calculate cumulative probability distribution functions for the microscopic total cross section. The elastic, fission, and radiative capture cross sections are also tabulated as the average values of each of these partials conditional upon the value of the total. This paper summarizes how the probability tables are utilized in this MCNP upgrade and compares this treatment with the approximate smooth treatment for some example problems

Availability note (English)

Available from INIS in electronic form; ALSO AVAILABLE FROM OSTI AS DE98005277; NTIS; US GOVT. PRINTING OFFICE DEP.

Files

Restricted

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Additional details

Publishing Information

Imprint Pagination
10 p.
Report number
LA-UR--98-26

Conference

Title
technologies for the new century
Acronym
Radiation protection and shielding topical meeting
Dates
19-23 Apr 1998
Place
Nashville, TN (United States)

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
30009418
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S99: GENERAL AND MISCELLANEOUS;
Resource subtype / Literary indicator
Conference
Descriptors DEI
DISTRIBUTION FUNCTIONS; M CODES; MODIFICATIONS; N CODES; NEUTRON REACTIONS; NEUTRON TRANSPORT; NUCLEAR DATA COLLECTIONS; PROBABILITY; RESONANCE; SELF-SHIELDING; TOTAL CROSS SECTIONS
Descriptors DEC
BARYON REACTIONS; COMPUTER CODES; CROSS SECTIONS; HADRON REACTIONS; NEUTRAL-PARTICLE TRANSPORT; NUCLEAR REACTIONS; NUCLEON REACTIONS; RADIATION TRANSPORT

Optional Information

Contract/Grant/Project number
Contract W-7405-ENG-36
Funding organization
USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)
Secondary number(s)
CONF-980403--