summary report of the slac neutronhp workshop
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Summary report of the SLAC neutronHP workshop. KOI, Tatsumi. New and Future Development (Tue. 09:30-12:00). ParticleHP and Interpolation Scheme Adding break up reaction to HP Status and feature development of GND, GIDI and G4LEND Development of Fission Fragment Generator .

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new and future development tue 09 30 12 00
New and Future Development (Tue. 09:30-12:00)

ParticleHPand Interpolation Scheme

Adding break up reaction to HP

Status and feature development of GND, GIDI and G4LEND

Development of Fission Fragment Generator


What is particle_hp?

  • neutron_hp package uses evaluated nuclear data bases for neutron interactions:
    • Total cross sections
    • Inelastic channel cross sections
    • Double differential spectra of outgoing particles
    • Gamma emission because of nuclear level transitions
  • particle_hp: do the same for (inelastic) interactions of other particles (p, d, t, He3, )

Inelastic interactions of p/d/t/He3/ particles E < 200 MeV

neutron hp particle hp interpolation of double differential cross sections
neutron_hp/particle_hp: interpolation of doubledifferentialcrosssections
  • GND
    • New “nuclear” data structure to replace ENDF-6 format
      • ENDF atomic data also
  • GIDI
    • Transport code API for reading and sampling GND data
    • Infrastructure for reading, viewing, modifying, checking, processing and writing GND data
gidi code languages
GIDI code languages
  • Written in C
    • will probably convert to C++ in the next few years
  • GEANT4 wrappers written in C++
    • Interface called G4LEND
      • Low Energy Nuclear Data (LEND)
  • Needs several LLNL libraries
    • PoPs (Property of Particles)
    • statusMessageReporter
    • numericalFunctions
fission event generation
Fission Event Generation
  • Goal: single event perspective
    • Accurately reproduce single fission event
    • Maintain overall fission statistics
  • Conservation
    • Mass
    • Momentum
    • Energy

Fission Sampling

performance improvement tue 13 30 15 00
Performance Improvement (Tue. 13:30-15:00)

Performance improvement of neutronHP by simplified Doppler broadening

Advanced applications of neutron simulation and data formats

conservation tue 15 00 17 00
Conservation (Tue. 15:00-17:00)

Introduction of conservation problem on data driven models

validation of gammas emission from neutron captured by nitrogen nucleus
Validation of gammas emission from neutron captured by Nitrogen nucleus

Data: G. E. THOMAS et al., NIM 56, pp325-337 (1967)

biasing wed 08 30 10 00
Biasing (Wed. 08:30-10:00)

Review of Geant4 biasing

nuclear devices wed 10 30 11 30
Nuclear Devices (Wed. 10:30-11:30)

G4-STORK: Stochastic Calculations of Reactor Kinetics

Accuracy and speed of the HP models

data preparation and documentation wed 11 30 12 00 lunch break 13 30 15 00
Data preparation and documentation (Wed. 11:30-12:00,Lunch Break, 13:30-15:00)

CIEMAT data preparation for IAEA

See later slide

LLNL data preparation and international GND project

See later slide

Documentation of data format

Prepare documentation of cross section part

Full documentation needs huge efforts

Possibility to use conversion tools for providing information

UI commands for setting environment variables of HP


International collaboration (WPEC SG38) has been formed to design a new format for storing nuclear data, and to oversee the transition from ENDF-6 to the new format.

  • LLNL proposed this collaboration in order to promote GND (or something based on it) as the new standard
  • Entitled ‘Beyond the ENDF format: a modern nuclear database structure.’
  • Resources:


Use phone connection rather than PC

Toll free numbers are available for most countries

Web Application

Chat to specified person sometime useful

Every video from web-cam has same display size

Slide Share

Only chair person controls slides

Converting slides takes a long time

Only one set of slides can handle per session


Sound quality is surprisingly good and slides are also showing

Available from


Thank you very much for all physical and remote participants!!

I wish to have next round meeting soon!