Scintillation array development for the SpecMAT detector

Friday 9 December 2016, 1.00PM

Speaker(s): Oleksii Poleshchuk

Study of exotic isotopes in the neutron-rich region of Ni (Z=28) and Zn (Z=30) with the SpecMAT detector will investigate the fundamental questions related to shell structure of nuclei far from stability. Transfer reactions on light nuclei in inverse kinematics will be used. The SpecMAT detector will consist of a Time Projection Chamber (TPC) surrounded with gamma detection array. This detector is going to be placed in a high magnetic field (up to 4T) to reconstruct the energy of the recoil particle based on the curvature of the particle track. The array of scintillation detectors will be used for gamma spectroscopy of directly populated low-lying levels in the transfer reactions.

In order to properly design the detector setup, it is necessary to make a simulation of the setup and test each of the component in the conditions close to the experimental environment. Since the detector will be operated in 4T magnetic field, we should verify if the gamma detection array and electronics could have the same performance in the high magnetic field as under the normal conditions. Energy resolution of cubic 1,5”x1,5”x1,5” LaBr3:Ce and CeBr3 scintillator coupled to SiPMs have been measured in 1,7T and 3T magnetic fields using analog, standard digital data acquisition systems and General Electronics for TPC (GET). In addition to detector tests, performance of an ASIC Support and Analogue to Digital conversion board (AsAd) which contains 4 ADCs of the GET electronics was tested in 3T magnetic field. 

Several simulations in GEANT4, prior detector design and results from the tests in the magnetic fields will be discussed.

Location: P/T007