SIMC (simc_gfortran) is the standard Hall C Monte Carlo for coincidence reactions, written in FORTRAN.

• SIMC simulates the optics (using COSY models) and apertures of the Hall C spectrometers (HMS, SOS, SHMS) and other spectrometers at Jefferson Lab (HRS's, BigCal, ...)
• Radiative effects, multiple scattering, ionization energy loss and particle decay are included
• Simple presecriptions are available for Final State Interactions, Coulomb Corrections and other effects.

SIMC has physics models for the following reactions.

• Elastic and quasi-elastic scatering: H(e,e'p), A(e,e'p)
• Exclusive pion production: H(e,e'pi+)n, A(e,e'pi+/-) (quasifree or coherent)
• Kaon electroproduction: H(e,e'K+)Lambda,Sigma, A(e,e'K+/-),A(e,e'K-)
• Semi-inclusive pion production: H(e,e'pi+/-)X, D(e,e'pi+/-)X
• Semi-inclusive kaon production: H(e,e'K+/-)X, D(e,e'K+/-)X
• Diffractive rho production: H(e,e'rho->pi+ pi-)p, D(e,e'rho->pi+ pi-)

• Not a full detector response simulation a la GEANT/GEANT4
• Does NOT simulate a large class of processes simultaneously to gerate backgrounds (like Pythia for example)
• Not a generic event generator. Processes are generated over a limited phase space matching the spectrometer acceptances
• Not hard to modify

An overview of SIMC can be found in this presentation at the 2009 Hall A Collaboration Meeting

For more information, see the SIMC Monte Carlo page in the Hall C Wiki