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 ^{74}Rb", based on the analysis of in-beam ^{80}Rb 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.
References
HPGe, LaBr3, SCEPTAR Simulations: E. Rand^{1}
Si(Li) Simulation: T. Ma^{2, 3}, D. Cross^{2}, R. Dunlop^{1}, W. Mills^{3}, Z. -M. Wang^{2, 3}, C. Andreoiu^{2}