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Implementation/improvement of CHIPS hA elastic cross-sections

Mikhail Kosov , Physics Validation, 2/10. Implementation/improvement of CHIPS hA elastic cross-sections. Introduction. Inelastic pA cross-sections have been tuned by s in (“ex”)= s tot (ex)- s el (CHIPS).

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Implementation/improvement of CHIPS hA elastic cross-sections

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  1. Mikhail Kosov, Physics Validation, 2/10 Implementation/improvement of CHIPS hA elastic cross-sections

  2. Introduction Inelastic pA cross-sections have been tuned by sin(“ex”)=stot(ex)-sel(CHIPS). At some energies sin(“ex”) differs from direct sin(ex). The CHIPS sel(NA) approximation must be improved there. The next step is to improve the CHIPS sel(hA) CHIPS approximation, using sel(“ex”)=stot(ex)-sin(CHIPS) “data” Use CHIPS Glauber calculations of sel

  3. n n n It means that the elastic nPb CHIPS cross-sections must be improved

  4. Use of the stot=sin+sel CHIPS test tool • Ideally sel(CHIPS) must coincide with stot-sin(CHIPS), as this is shown for the neutron-aluminium interactions. • This is not true for neutron-lead interactions for p<0.3. • In this presentation cleaning up of sel of pA interaction is presented: a new analytics 2D-functionsel(p,A) for pA. • As a next step, CHIPS 2D-functions sel(p,A) for hA are implemented in Geant4 and compared with other G4 sel. • An upgrade is necessary for neutron-nuclear interactions: “cleaning up of elastic” + “binary inelastic”, but at low energies it demands individual fit for each target-isotope. • A G4Had wrapper for the CHIPS elastic cross-sections is implemented to be used by other G4 hadronic processes.

  5. A bug?

  6. CHIPS parameterization of sel for hA • CHIPS calculation: sel=∫(1-e-sT(b)/2)2d2b (---------) • Fortunately, at low energies there are data pA. • The CHIPS sel(pA) function is good in D-region • The Barashenkov’s sel(pA) fit does not look much better than the LHEP (GEISHA) fit (all energies) • The threshold of the Glauber-Gribov and LHEP fits is too low and BGG has too high thresholds • In the GeV region all G4 fits (other than CHIPS) have strange position of the cross-section maxima • The CHIPS pA fit is significantly below other G4 fits, what can a bit accelerate CHIPS calculations

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