SIMGAM Version History

SIMGAM - COMPTEL Photon Simulation

• Version 21 (4-Nov-1996 at MPE)
  • Corrects error in ²⁷Mg decay mode.
  • Updates handling of beta-particle energy spectrum.
  • ²²Na background.
  • UNH-IDT-1020 and MPE-IDT-10025 interchangeable for all modes.

• Version 20 (13-Sep-1996)
  • IBEAM = 13 : ²⁸Al, single photon plus beta.
  • IBEAM = 14 : ²⁷Mg, two photons plus beta (branching ration slightly incorrect.
  • Both new modes require UNH-IDT-1020,

• Version 19 (23-Aug-1996)
  • ⁴⁰K mode (requires MPE-IDT-10025, which provides more deatiled mass distribution for d1 PMTs).
  • ²⁴Na cascade event simulation now includes beta particle (requires UNH-IDT-1020).
  • IBEAM limitations removed so that new modes could be used.

• Version 18 (30-Jul-1996)

• Version 17 (6-May-1996)
  • Corrects GEANT initialization problem that existed in versions 15 and 16.
  • D1 backgrond mode modified to work properly with high resolution mass models.

• Version 16 (12-Apr-1996)
  • Secondary particle generation now performed in all materials.
  • Added "wide beam" input geometry for telescope mode.
  • Increased GEANT memory allocation to handle more complicated mass model structures.

• Version 15 (6-Mar-1996)
  • Added use of GEANT 3.21
  • Updated algorithm for diffuse source simulation. Photon beam is now constant area for all angles.
  • ToF computed using energy-averaged start/stop times.

Last Updated: February 2, 1998