Abrasion-Ablation Monte Carlo for Colliders or AAMCC

Abrasion-Ablation Monte Carlo for Colliders (AAMCC) is Monte-Carlo model specially desined to describe spectator matter production in a wide range of colliding nuclei and energy of the collision on the event-by-event basis

Main assumtions of AAMCC

Nucleus-nucleus collisions are simulated by means of the Glauber Monte Carlo model. Non-participated nucleons form spectator matter (prefragment).
Excitation energy of prefragment can be calculated via one of 4 parametrization:
- Ericson formula
- Gamaird-Schmidt formula
- ALADIN collaboration parametrization
- Hybrid approach. Excitation energy is calculated as follows:
  - in peripheral collisions with less then ~15% of removed nucleons the particle-hole model is used 2) (Ericson formula);
  - otherwise a parabolic ALADIN approximation 3) is applied with parameters tuned to data obtained in nuclear emulsions.
Decays of prefragments are simulated as follows:
- pre-equilibrium decays modelled with MST-clustering algorithm;
- Fermi break-up model from Geant4 v9.2;
- Multifragmentation is caclated via one of two approaches: SMM in realisation of Geant4 v10.4 (options AAMCC or G4), ABLAXX (option ABLAXX).
- Evaporation-fission calculation can be carried out via one of two models: ABLAXX evaporation (options ABLAXX or AAMCC) or Weisskopf-Ewing (option G4) evaporation, both adopted from Geant4 v10.4.