GREAT : Studies of Nuclei far from Stability by Tagging Techniques

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GEANT-calculations for the GREAT set-up

A GEANT based program was written for Monte-Carlo simulations of the whole GREAT setup and/or its seperate parts. The program is written in FORTRAN and has about 2500 lines of (well commented) code. The program will help us to model and to understand the response of (different parts of) GREAT in real experimental conditions.

The input data for the simulations are:

  • Full geometry of the GREAT set-up including all of the detectors, dead layers, detector chambers etc. All of the sizes/distances being as close as possible to the real ones.

  • Experimentally measured position (X-Y-Implantation depth) Intensity distrubutions of the recoils, taken from experiments performed at SHIP and RITU.
  • Type, energy and emission angle of the particles to be detected (alpha/beta/gamma/low energy electrons).
The Output data include:
  • Efficiency curves (singles) as a function of energy for each of the radiation types and each detector type in GREAT.

    An example of the Ge efficiencies as calculated by GEANT are shown below

  • Efficiency curves for different types of coincidence events.
  • BGO/CsI shield efficiency for the Clover detectors.
  • Spectra shapes, including alpha-electron summing effects, electron backscattering etc...

    An example of the Si box efficienies/spectra resulting from electrons is shown below:


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Last modified: Tue Jan 20 11:54:06 GMT Standard Time 2004