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Changes between Version 25 and Version 26 of physicsInput


Ignore:
Timestamp:
Nov 19, 2012, 10:52:56 AM (7 years ago)
Author:
larionov
Comment:

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  • physicsInput

    v25 v26  
    55
    66The GiBUU model includes 61 baryonic and 31 mesonic states. The necessary parameters (e.g. pole masses, life times in vacuum, branching ratios) are based on the [http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=find++a+manley+and+saleski&FORMAT=WWW&SEQUENCE= Manley analysis] and the [http://pdg.lbl.gov/ PDG] compilation. The BUU equation is solved applying a test-particle ansatz in a full ensemble scheme which guarantees locality in the scattering processes of the test-particles. Resonances are explicitly propagated, [wiki:testOffshell in particular off-shell]. Hence an off-shell potential according to [htdocs:files/effenberger.pdf Effenberger et al.] is introduced which influences the time-development of the spectral functions. The loss and gain terms include besides particle decays also [wiki:Xsections two] and three-body reaction channels. The low-energy two-body reaction rates are to a large extent given by resonance excitations. Whereas at higher center-of-mass energies (above 2 GeV for meson-baryon and above 2.6 GeV baryon-baryon scattering) an enhanced version of [http://www.thep.lu.se/~torbjorn/Pythia.html Pythia]  is implemented to describe the reaction processes. The Hamiltonian of the nucleon and baryonic resonances includes a momentum-dependent Skyrme-like potential. For the pion, we consider a low-energy potential based on the Delta-hole model and on pionic atom phenomenology. Also Coulomb distortions are taken into account.
    7 The nuclear ground state is treated within a local Thomas-Fermi approximation. For this the nuclear density profiles are parametrized according to elastic electron-scattering data and Hartree-Fock nuclear-many-body calculations. The disintegration of excited nuclear residues is simulated on the basis of the Statistical Multifragmentation Model
    8 [http://inspirehep.net/record/405803 (SMM)]. The GiBUU code is written modular in Fortran 2003 and is being developed in a multi-user environment.
     7The nuclear ground state is treated within a local Thomas-Fermi approximation. For this the nuclear density profiles are parametrized according to elastic electron-scattering data and Hartree-Fock nuclear-many-body calculations. The disintegration of excited nuclear residues is simulated on the basis of the [http://inspirehep.net/record/405803 Statistical Multifragmentation Model].
     8The GiBUU code is written modular in Fortran 2003 and is being developed in a multi-user environment.
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