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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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)

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 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

  • 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

  • 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 of neutronHP by simplified Doppler broadening

Advanced applications of neutron simulation and data formats

Geant4 Tutorial Cource

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

Introduction of conservation problem on data driven models

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)

Review of Geant4 biasing

Geant4 Tutorial Cource

Nuclear Devices (Wed. 10:30-11:30)

G4-STORK: Stochastic Calculations of Reactor Kinetics

Accuracy and speed of the HP models

Geant4 Tutorial Cource

Geant4 Tutorial Cource

Geant4 Tutorial Cource

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!

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