The challenges for new calorimetry for incoming experiments at intensity frontiers is to provide detectors with ultra-precise time resolution and supreme energy resolution.
Two very promising materials on the market are BrilLanCe (Cerium doped Lanthanum Bromide,
LaBr3 (Ce)) and LYSO (Lutetium Yttrium OxyorthoSilicate, Lu2(1-x) Y2x SiO5 (Ce)), supported by recent developments aiming at providing new relative large crystals.
The response of both LaBr3 (Ce) and LYSO prototypes fired with gammas at an energy of 55 MeV have been studied. Very promising results have been obtained.
For the (R = 4.45 cm, L = 20.3 cm) LaBr3 (Ce) crystal an energy resolution of σE /E ∼ 2.3(1)% and a timing resolution of σt ∼ 35(1) ps have been predicted. The energy resolution can be further improved by using larger crystals (either R = 6.35 cm or R = 7.6 cm, L = 20.3 cm) approaching respectively a σE/E ∼ 1.20(3)% and a σE /E ∼ 0.91(1)%.
Competitive results can be obtained with (R = 3.5 cm, L = 16 cm) LYSO crystal with an energy resolution of σE /E ∼ 1.48(4)%, that can be further improved ( R = 6.5 cm, L = 25 cm, σE /E ∼ 7.37(1)% ). A timing resolution less performing than the LaBr3 (Ce) one but better than any available nowadays calorimeter working at this energy can be obtaiend, σt ∼ 49(1) ps, ultimately improved to σt ∼ 40(1) ps with optimal photosensors.
Such results put these future high energy calorimeters at the detector forefront at intensity frontiers.