GRIFFIN Efficiency Calculator
- HPGe GEANT4 Simulation: 8th order polynomial fit including SCEPTAR and Delrin vacuum chamber.
- LaBr3 GEANT4 Simulation: 8th order polynomial fit above 40 keV including SCEPTAR and Delrin vacuum chamber.
- Si(Li) Simulation: Relative Efficiency curve shape based on formalism referenced in Radiation Detection & Measurement (G.F. Knoll, Wiley 2000). Note that the Si(Li) simulations are known to differ from experiment at the 30% level. An absolute normalization is applied per Masters Thesis of Ryan Dunlop, University of Guelph, 2012, "High-precision branching ratio measurement for the superallowed β+ emitter 74Rb", based on the analysis of in-beam 80Rb decay.
- SCEPTAR GEANT4 Simulation: triple Fermi function fit adjusted to asymptotically approach 0.8 at high Q per experiment. Low-Q position efficiencies fixed to 0.065% per simulated annihilation photopeak efficiency.
The following four configuration efficiencies are based on solid angle coverage of detectors:
- DESCANT: 27% efficient between 1 and 5 MeV; efficiency lower outside this range, and no value is reported here.
- SCEPTAR + ZDS: 65% efficient.
- SCEPTAR + PACES: 40% efficient.
- PACES + ZDS: 25% efficient.
- HPGe, LaBr3, SCEPTAR Simulations: E. Rand1
- Si(Li) Simulation: T. Ma2, 3, D. Cross2, R. Dunlop1, W. Mills3, Z. -M. Wang2, 3, C. Andreoiu2
- Web App: W. Mills3 (source)
- 1 University of Guelph, Guelph, ON, Canada, N1G 2W1
- 2 Simon Fraser University, Burnaby, BC, Canada, V5A 1S6
- 3 TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, Canada, V6T 2A3