Grady Hughes LA_UR_1.. - Computational Medical Physics Working ...

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Temperature-Specific Neutron Cross Sectionsfrom MAKXSF• Now part of the cross-section library managerprogram MAKXSF• Create cross-section tables at new temperatures– Doppler broaden resolved resonance data to highertemperature– Interpolate unresolved resonance probability tables to newtemperature– Interpolate S(α, β) thermal data to new temperature• Create new xsdir file which includes the changedcross-section tables.Operated by the Los Alamos National Security, LLC for the DOE/NNSASlide 16
Photon EnhancementsOperated by the Los Alamos National Security, LLC for the DOE/NNSAENDF/B VI.8• Extension of existing data: from ≥ 1 keV down to ≥ 1 eV– Coherent scattering– Incoherent scattering– Photoelectric absorption• New kinds of photoatomic data– Subshell-wise photoelectric cross sections– Detailed sampling of initial vacancy now possible– Complete information for electron subshells– Binding energies, electron populations, transitions, etc.• Extended scattering form factors– Coherent and incoherent scattering– Complete range of energy and angle– Accurate interpolation (especially for coherent scattering)• Cold, neutral, atomic target materials Z = 1 … 100Slide 17
Page 1 and 2: LA-UR-12-24401Approved for public r
Page 3 and 4: AbstractMCNP (Monte Carlo N-Particl
Page 5 and 6: MCNP Development Team• Los Alamos
Page 7 and 8: Features of Interest to Medical Phy
Page 9 and 10: Extended Limits on Problem SizeMCNP
Page 11 and 12: Large Lattice Improvements: Memory
Page 13: Electron Energy Straggling Improvem
Page 17: Photon Doppler Broadening• Releas
Page 23 and 24: Zubal Head GeometrySlide 21Operated
Page 25 and 26: N14(n,p)C14 ReactionSlide 23Operate
Page 27 and 28: Summary• MCNP is a powerful gener

Grady Hughes LA_UR_1.. - Computational Medical Physics Working ...

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