E. Mendoza, D.Cano-Ott Nuclear Innovation Unit (CIEMAT)

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Presentation transcript:

E. Mendoza, D.Cano-Ott Nuclear Innovation Unit (CIEMAT) Necessary improvements of G4NeutronHP for the new libraries. Resolved and open questions. E. Mendoza, D.Cano-Ott Nuclear Innovation Unit (CIEMAT)

Necessary implementations - For the use of the new generated neutron libraries it is necessary to include the possibility of reading capture photon data in MF=6 format. This can be done (and it has been done), by performing a very little modification in the GEANT4 code, since GEANT4 reads and interprets photon data in MF=6 format for other reactions (inelastic = all except elastic, capture and fission). - Same for neutrons in the fission process, but only for three isotopes: 232Th, 231Pa, 233Pa in ENDF_VII.0. The MF=6 format data has been translated into MF=4,5 (uncorrelated) data, but maybe for a future it would be better to use MF=6 format.

Neutron validation results In the GEANT4 comparison with MCNPX done up to now, three main differences have been found: 1- Thermal neutrons: include more thermal neutron libraries?. There are only three materials available, whereas there are 20 in ENDF-VII.0, 9 in JEFF-3.1, 15 in JENDL-4.0, … 2- The “inelastic” problem: cross sections should include the QI value for the calculation of the energy secondary particle, instead of using the Inelastic/Gamma folders.  include Breakup reactions? 3- Self shielding treatment: some procedure to treat the URR could be implemented. It should be based in cross section evaluated data for the URR: statistical parameters such as the main distance between resonances, size, … 4- Fission???

Non-neutron validation results - No validation for particle production (different) than neutrons have been performed by CIEMAT. - Gamma production: 1- Gamma production in ENDF files is usually UNCORRELATED data. 2- Gamma production in ENDF files can be incomplete or missing. Possibilities to manage the photon production in GEANT4: 1- Use ENDF data (only). 2- Use models. 3- Use both ??? Mixing models with ENDF data has to be done with extremely care.

Non-neutron validation results Possible solution: include a flag which specifies how to manage the photon production data. - PFlag=0: use ENDF data. - PFlag=1: use models. - PFlag=2: use ENDF data, if there is no data, use models. -PFlag=3: …  adjust_final_state method of the G4NeutronHPFinalState class.

General comments 1- Lack of data: ENDF format libraries have some amount of isotopes. However, there are: A- Some isotopes are missing. B- The information for each isotope has to be, in principle, complete (exception: ROSFOND library). However, this doesn’t mean that all reactions are 100% perfectly described, specially for secondary particles different than neutrons. What to do? A- By default, if one isotope is missing, take the natural component (Warning in the output), if there is no natural component, exit. (export G4NEUTRONHP_SKIP_MISSING_ISOTOPES=1) B- Several options can be taken: 1- Perform the simulation with the available data (do not generate secondary particles if there is no data). 2- Use models. 3- Distribute only isotopes with some minimal information. 4- Use some flags to determine what to do. 5- …

General comments - One idea is to implement the possibility of writing into a file information concerning the G4NDL data which has been read, the data which is going to be used in the simulation. 2. Additional ENDF data: There is some information in the ENDF-6 format files which are not used (?) by GEANT4. Some source code can be developed in order to use this information. In particular: 1- File MF=8: Radioactive decay and fission product yield data. 2 – File MF=9: Multiplicities for production of radioactive nuclides. 3 – File MF=10: Cross sections for production of radioactive nuclides. 4- Files MF=30-40: Covariance data. 3. Reaction MT=5: this is an special reaction. It is an undefined reaction, it can be every mix of reactions. The residual nucleus is not well determined. 4. Residual nucleus: sometimes there are residual nuclei information in the ENDF data files, as an outgoing particle. This information is not used by GEANT4.

Additional comments - Some classes should be revised: + G4NeutronHPContAngularPar: there are some ENDF data which is not well interpreted. + G4NeutronHPDiscreteTwoBody: some errors in the code. +G4NeutronGPInelasticComp: the two_body_reaction method should be revised.