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Anti-Proton Nucleus Elastic Scattering

Anti-Proton Nucleus Elastic Scattering. A. Galoyan and V. Uzhinsky 25 May 2011. ● New G4 Class “G4AntiNuclElastic” - for simulation of Anti-Nucleus – Nucleus Elastic scattering ● Effective parameters of the black disk model with diffuse boundary

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Anti-Proton Nucleus Elastic Scattering

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  1. Anti-Proton Nucleus Elastic Scattering A. Galoyan and V. Uzhinsky 25 May 2011 ● New G4 Class “G4AntiNuclElastic” - for simulation of Anti-Nucleus – Nucleus Elastic scattering ● Effective parameters of the black disk model with diffuse boundary ● Simulation method of Coulomb and Hadronic scatterings ● Cross sections ● Calculation results ● Conclusion and plans 1

  2. Class: GEANT4 G4VHadronElastic Base class G4AntiNuclElastic New class G4double SampleInvariantT ( const G4ParticleDefinition* p, G4double plab, G4int Z, G4int A); Derived methods Sampling of polar angle Theta G4double SampleThetaCMS( particle, plab, Z, A); Methods: G4double SampleThetaLab( p, plab, Z, A); and other methods cs, fTeta1, fTetaCMS, fThetaLab, fRa, fRef et al. Data of class: 2

  3. SampleInvariantT (p, plab, Z, A); G4AntiNuclElastic:: Coulomb – Wentzel scattering ( V.M. Grishine/ CPC 181 (2010) 921 ) 3

  4. G4AntiNuclElastic:: SampleInvariantT (p, plab, Z, A); Glauber theory for anti-nucleus - nucleus interactions Amplitude of hadron-nucleus elastic scattering in Glauber theory Amplitude of nucleus-nucleus elastic scattering in Glauber theory Differential elastic scattering cross section Accordingto Black Diskmodel with Diffuse boundary 2-dimensional Fourier transform of P(b) must be: * (1) 4

  5. Effective parametersof black disk model 5

  6. Effective parametersof black disk model 6

  7. Simulation method of Coulomb and Hadronic scatterings 1. Choose: Coulomb or hadronic scattering? Coulomb cross section: Hadronic cross section: G4ComponentAntiNuclNuclearXS 2. Simulate: Coulomb or hadronic scattering? Coulomb scattering: analytical inverse function Hadronic scattering: rejection method Magorant function Rejection function 7

  8. Cross sections – LHEP ones are bad!

  9. Cross sections – CHIPS and our Xs O.K. 9

  10. Calculation results – It would be well to improve! 10

  11. Calculation results - Predictions 11

  12. Calculation results 12

  13. Conclusion and plans 1. The Glauber theory was used for estimations of the cross sections 2. Effective parameters “R” and “c” of Black Disk model were found. 3. G4 Class G4AntiNuclElastic for simulation of anti-nucleon and anti- nucleus nucleus elastic scattering has been created. 4. Differential cross sections of elastic scattering of antiprotons with nuclei were calculated using the class G4AntiNuclElastic. Good description of known exp. data were obtained. LHEP cross sections are not realistic! It would be well to improve CHIPS. The real part of amplitudes must be considered by us. Take into account the real part of NNbaramplitude in simulation of anti-nucleon and anti- nucleus nucleus elastic scattering. 2. More accurate treating of the Coulomb scattering in the Glauber approach. Accounting of anti-hyperons and anti-hyper-nuclei elastic and inelastic interactions with nuclei 13

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