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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). - PowerPoint PPT Presentation
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Implementation/improvement of CHIPS hA elastic cross-sections
Mikhail Kosov, Physics Validation, 2/10
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 2Physics validation meeting,CERN, 10.02.2010
Introduction Inelastic pA cross-sections have been
tuned by in(“ex”)=tot(ex)-el(CHIPS).At some energies in(“ex”) differs from
direct in(ex). The CHIPS el(NA) approximation must be improved there.
The next step is to improve the CHIPS el(hA) CHIPS approximation, using el(“ex”)=tot(ex)-in(CHIPS) “data”
Use CHIPS Glauber calculations of el
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 3Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 4Physics validation meeting,CERN, 10.02.2010
It means that the elastic nPb CHIPScross-sections must be improved
n
n n
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 5Physics validation meeting,CERN, 10.02.2010
Use of thetot=in+el CHIPS test tool Ideally el(CHIPS) must coincide with tot-in(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 el of pA interaction is
presented: a new analytics 2D-function el(p,A) for pA. As a next step, CHIPS 2D-functions el(p,A) for hA are
implemented in Geant4 and compared with other G4 el. 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.
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 6Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 7Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 8Physics validation meeting,CERN, 10.02.2010
A bug?
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 9Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 10Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 11Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 12Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 13Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 14Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 15Physics validation meeting,CERN, 10.02.2010
CHIPS parameterization of el for hA CHIPS calculation: el=∫(1-e-T(b)/2)2d2b (---------) Fortunately, at low energies there are data A. The CHIPS el(A) function is good in -region The Barashenkov’s el(A) 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 A fit is significantly below other G4
fits, what can a bit accelerate CHIPS calculations
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 16Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 17Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 18Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 19Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 20Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 21Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 22Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 23Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 24Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 25Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 26Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 27Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 28Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 29Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 30Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 31Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 32Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 33Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 34Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 35Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 36Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 37Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 38Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 39Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 40Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 41Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 42Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 43Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 44Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 45Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 46Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 47Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 48Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 49Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 50Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 51Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 52Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 53Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 54Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 55Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 56Physics validation meeting,CERN, 10.02.2010
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 57Physics validation meeting,CERN, 10.02.2010
Conclusion New CHIPS elastic pA fit is better than old one At low energies there are big uncertainties in
different estimations of hA & practically no data The best existing (not CHIPS) approximation is
the Barashenkov fit (pA, A), which significantly differs at low E from the CHIPS fit for big A
The Glauber-Gribov fit is not reliable at low E BGG has too high threshold and, probably, bugs. The pA ENDF/B VII is too low, but the maxima
positions coincide with the integrated CHIPS fit CHIPS hA fit is usually below other G4 fits, but
at low E CHIPS electromagnetic must be added
M. Kosov, CHIPS hadron-nuclear elastic cross-sections 58Physics validation meeting,CERN, 10.02.2010
Thank you
Backup slides following
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