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HK: Fachverband Hadronen und Kerne
HK 10: Accelerators and Instrumentation II
HK 10.5: Talk
Monday, March 16, 2009, 15:15–15:30, H-ZO 90
A high Resolution Phoswich detector: LaBr3(Ce) coupled with LaCl3(Ce) — •Mariano Carmona Gallardo1, Jose Antonio Briz Monago1, Olof Tengblad1, Manuela Turrion Nieves1, Vincent Gugliermina1, and Bilal El Bakkari2 — 1IEM-CSIC, Madrid, Spain — 2Dep. of Physics, Rabat, Marocco
The gamma calorimeter CALIFA which is to surround the Target position of the R3B experiments at FAIR is to detect high energy gammas and protons emitted in Nuclear Reactions at Relativistic Energies.
In the design of CALIFA's forward cap an innovative solution using two scintillating crystals stacked together one after the other in a so called Phoswich configuration is being considered. Simulations show that the gamma deposit most of the energy in the vicinity of the first impact and this with high probability happens already in a few cm of material. Combining two materials one could thus distinguish at what depth the impact happens; use a first short crystal of a high resolution material followed by a longer piece of a less expensive material. The second layer is used to fully absorb the gamma energy or in the case of first hit in the second layer to veto that specific event.
For protons, two layers detector is also useful in order to determine the initial energy. It is possible to determine the initial energy by the energy loss in two shorter crystals.
We report here on results that has been obtained with a Phoswich detector made from 30 mm long LaBr3(:Ce) stacked with 50 mm long LaCl3(:Ce) crystals in a cylindrical configuration of 20 mm diameter.