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Physics List. Paul Guèye Hampton University, Hampton VA - USA Brief History Importance of Geant4 Physics & Cuts Ex: Hadronic Physics What to do …. Brief History Geant4 related publications First release: 1998 Impact in science Release Simple Google Search (all publications)

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Physics list l.jpg
Physics List

Paul Guèye

Hampton University, Hampton VA - USA

  • Brief History

  • Importance of Geant4 Physics & Cuts

  • Ex: Hadronic Physics

  • What to do …

Physics List P. Gueye


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Brief History

Geant4 related publications

  • First release: 1998

  • Impact in science

    Release Simple Google Search

    (all publications)

    1999 63,200

    2007 (1st half) 205,000

  • About one order of magnitude by end of 2007!!

Physics List P. Gueye


Importance of physics and cuts l.jpg
Importance of Physics and Cuts

  • Which physics list?

  • Which model?

  • Which cuts?

    Example in nuclear/high energy physics

  • >>10 analysis (students, postdocs, faculty …)

  • Need to use exactly the same tools

    Particle ID Beam energy Efficiencies …

    Detector cuts Beam angle Dead time …

  • Importance of the analysis tool

    (i.e., ntuples - see Analysis talk @ 14:00)

Physics List P. Gueye


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Ex: Hadronic Physics in Geant4

http://geant4.web.cern.ch/geant4/physics_lists/

Previously mentioned (Gunter’s talk)  “Educated Guess” – not updated (in work …)

  • High energy physics calorimetry

  • High energy physics trackers

  • 'Average' HEP collider detector

  • Low energy dosimetric applications with neutrons

  • Low energy nucleon penetration shielding

  • Linear collider neutron fluxes

  • High energy penetration shielding

  • Medical and military neutron applications

  • Low energy dosimetric applications

  • High energy production targets (ex. 400 GeV p on C or Be)

  • Medium energy production targets (ex. 15-50GeV p on light targets)

  • LHC neutron fluxes

  • Air shower applications

  • Low background experiments

Physics List P. Gueye


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CHIPS

At rest

Absorption

K, anti-p

CHIPS (gamma)

Photo-nuclear, electro-nuclear

High precision neutron

Evaporation

Pre-

compound

FTF String (up to 20 TeV)

Fermi breakup

Multifragment

QG String (up to 100 TeV)

Photon Evap

Binary cascade

Rad. Decay

Bertini cascade

Fission

LE pp, pn

HEP ( up to 15 TeV)

LEP

1 MeV 10 MeV 100 MeV 1 GeV 10 GeV 100 GeV 1 TeV

Hadronic Model Inventory

… Previously shown (Aatos’ talk)

… plus G4BinaryLightIonCascade, G4WilsonAbrasion, G4EmDissociation

Courtesy: Dennis Wright

 Gunter Folger Talk

Physics List P. Gueye


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Process

At rest

In flight

Direct implementations

Cross sections

Models

Isotope production

Event biasing

Directimpl.

Directimpl.

Directimpl.

Directimpl.

Theoryframework

Highenergy

Spallation framework

Stringparton

Transport utility

Precompound

Cascade

Direct impl.

Evaporationutil.

Directimpl.

Stringfragmenation util.

Directimpl.

Directimpl.

Directimpl.

Frag function intfc

Fragfunctionimpl.

Hadronic Model Organization

… Previously shown (Aatos’ talk)

Courtesy: Dennis Wright

Physics List P. Gueye


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… and Primary Generator …

Case for energy distribution of radioactive materials

  • “Standard”: sampling from favorite function

    (i.e., Fermi, Poisson ...)

  • General Particle Source: handles radioactive decay

     Over or under-estimation of data?

Physics List P. Gueye


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What to Do …

Consequences when different tools are used

  • Comparison between published results is difficult

    Sometimes impossible!

  • Accuracy and robustness of results

  • Geant4 collaboration effort

    • Coherent approach lost

    • User support is difficult

      Resources

  • Geant4 website

  • G4NAMU

    http://geant4.slac.stanford.edu/g4namu/

  • Working groups

    http://geant4.cern.ch/collaboration/working_groups.shtml

Physics List P. Gueye


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