Status of particle_hp Pedro Arce Emilio Mendoza Daniel Cano-Ott (CIEMAT, Madrid)

July 2014 Status of particle_hp 2 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

July 2014 Status of particle_hp 3 Why particle_hp? Theory models or semi-empirical models sometimes cannot reproduce experimental data at low ( MeV), specially for low Z elements (J.M. Quesada agrees): IAEA medical DB (exper.) Geant4.9.5.p01 (QGSP_BIC_HP) p Energy (MeV)  ( barns ) p + 18 O  n + 18 F

July 2014 Status of particle_hp 4 What nuclear DBs are there? ENDF-VII:  Uses experimental data + thorough evaluations  Only a few isotopes (p:48, d:5, t:3, He3:2)  Only p  X reactions (MT=5)  double differential spectra of resulting particles (n,p,d,…), without channel information (n,nn,np,nna,...)  Up to 150 MeV for p (d: 50 MeV, t: 20 MeV, He3: 20 MeV)  ENDF-6 format TENDL:  Uses some experimental data + TALYS calculations  All isotopes (2400)  Only p  X reactions (MT=5)  All channels done in 2009, but not repeated  Up to 200 MeV  ENDF-6 format

July 2014 Status of particle_hp 5 What nuclear DBs are there? IAEA medical database:  Only experimental data  Only a few reaction channels of a few isotopes  Only channel cross sections  Simple text format IBANDL database:  Only experimental data  Not all isotopes  Many experimental measurements channel by channel  Low energy (up to a few MeV)  Own format

July 2014 Status of particle_hp 6 Code changes PHYSICS LIST: G4NeutronHPInelastic* theParticleModel=new G4NeutronHPInelastic(); G4ParticleHPInelastic* theParticleModel=new G4ParticleHPInelastic(G4Proton::Proton()); (default G4Neutron::Neutron() for backwards compatibility) G4NeutronHPInelasticData* theNeutronHPInelasticData=new G4NeutronHPInelasticData(); G4ParticleHPInelasticData* theProtonHPInelasticData= new G4ParticleHPInelasticData(G4Proton::Proton()); (default G4Neutron::Neutron() for backwards compatibility) theProtonHPInelasticData->SetMaxKinEnergy(200.);  Looking at the particle type, G4ParticleHPInelastic & G4ParticleHPInelasticData set the name of the environmental variable: "G4NEUTRONHPDATA“, "G4PROTONHPDATA“, "G4DEUTERONHPDATA“, "G4TRITONHPDATA“, "G4HE3HPDATA“, "G4ALPHAHPDATA" particle_hp compiled with geant ref04

July 2014 Status of particle_hp 7 neutron_hp CODE CHANGES:  No new classes: only modify neutron_hp package  Rename G4NeutronHP* → G4ParticleHP*  Thermal scattering only for neutrons  Eliminate assumptions that projectile is neutron and enviromental variable is “G4NEUTRONHPDATA” And add G4He3InelasticProcess G4ParticleHPChannel G4ParticleHPChannelList G4ParticleNames G4ParticleHPEnAngCorrelation G4ParticleHPContAngularPar G4ParticleHPContEnergyAngular G4ParticleHPInelastic G4ParticleHPInelasticData G4ParticleHPorLEInelastic G4ParticleHP*InelasticFS G4ParticleHPInelasticBaseFS G4ParticleHPInelasticCompFS G4ParticleHPFinalState Code changes

July 2014 Status of particle_hp 8 PARTICLE YIELD CORRECTIONS:  Number of particles of a type produced in an interaction is not sampled in neutron_hp (except for gammas):  Integer value is taken 2.43 → 2  Most charged particle data base isotopes do not have channel by channel cross sections, only particle yields (F02)  Also several dozens isotopes in most neutron data bases (46 in G4NDL 4.4) Apply Poisson statistics for all particles SOME ENVIROMENTAL VARIABLE RENAMING:  InelasticCompFSLogging >>> G4PARTICLEHP_InelasticCompFSLogging  G4NEUTRONHP_NEGLECT_DOPPLER >>> G4PARTICLEHP_NEGLECT_DOPPLER  G4NEUTRONHP_DO_NOT_ADJUST_FINAL_STATE >>> G4PARTICLEHP_DO_NOT_ADJUST_FINAL_STATE  G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION >>> G4PARTICLEHP_USE_ONLY_PHOTONEVAPORATION  G4NEUTRONHP_SKIP_MISSING_ISOTOPES >>> G4PARTICLEHP_SKIP_MISSING_ISOTOPES  AllowForHeavyElements >>> G4PARTICLEHP_AllowForHeavyElements  CaptureDataIndexDebug >>> G4PARTICLEHP_CaptureDataIndexDebug  InelasticCompFSLogging >>> G4PARTICLEHP_InelasticCompFSLogging  ParticleHPNamesLogging >>> G4ParticleHPDebug_NAMESLogging  ParticleHPNames >>> G4ParticleHPDebug_NAMES  HTOKEN >>> G4ParticleHPDebug_HTOKEN Code changes

July 2014 Status of particle_hp 9 Tests: compare with MCNP Secondary energy spectra (neutrons and gammas) at fixed energy  Send protons of fixed energy and force them to interact inelastically before losing energy  Score neutrons/gammas as they reach a sphere: do not let them interact n from p 22 MeV on Al27 n from p 100 MeV on Pb208  from p 100 MeV on Pb208  from p 22 MeV on Al27

July 2014 Status of particle_hp 10 Tests: compare with MCNP Secondary energy spectra (neutrons and gammas) losing energy  Send protons of fixed energy and let them interact until they lose all energy  Score neutrons/gammas as they reach a sphere: do not let them interac t  Can’t do that in MCNP: solution of building a minimal volume does not work because protons have to interact Use “ptrac” dump (  /tracking/verbose 1) and read it with GAMOS to create G4Track/G4Step  from p 149 MeV on Pb208 n from p 149 MeV on Pb208  from p 50 MeV on Fe56 n from p 50 MeV on Fe56

July 2014 Status of particle_hp 11 Tests: compare with MCNP Secondary angle spectra (neutrons)  Send protons of fixed energy and let them interact until they lose all energy  All start along X axis  Score neutrons/gammas as they reach a sphere: do not let them interact n from p 50 MeV on Al27n from p 100 MeV on Pb208

July 2014 Status of particle_hp 12 Conclusions  Geant4 (and other MC) theoretical models do not work well for charged particle (p, d, t, He3,  ) inelastic interactions at E < 200 MeV  Alternative implemented: use evaluated data bases  Several available (ENDF, TENDL, IAEA medical, IBANDL) particle_hp has been ported to geant ref04  particle_hp is begin tested (geant4.9.6.p02) Total cross sections and secondary production cross sections Secondary energy spectra  Secondary angle spectra  NEXT: check neutron_hp = particle_hp for neutrons (wait for a geant4.10 release including particle_hp) Agreed that particle_hp will replace neutron_hp when tests are finished