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PARIS array







PARIS array

PARIS (Photon Array for Radioactive and stable Ion beam Studies) is a collaborative European project to construct and operatea novel 4p gamma-ray calorimeter, which profits wholly or in part from employment of novel, advanced scintillator materials, such as Lanthanum Bromide (more details on the PARIS web page).
PARIS should have a performance superior to any existing scintillator calorimeter in terms of energy resolution. For low to medium-energy (10 MeV) gamma rays, the calorimeter should have an excellent energy resolution equivalent to ca. 4% for 1 MeV gamma rays. The calorimeter should be sufficiently thick to absorb gamma rays with energies up to 30-40 MeV but not necessarily with as high an energy resolution as that required for the lower energy range. This can be achieved by a calorimeter constructed either entirely from novel scintillator, or with two shells – an inner shell of novel scintillator and an outer shell of a conventional scintillator. In practice, the two shells may be optically coupled as a single “phoswich” device. The scintillators employed should have excellent timing resolution, at least less than 1ns for 511 keV gamma rays to allow for neutron-gamma discrimination. The geometry of PARIS should be such that it allows good interoperability with other apparatus such as AGATA, GASPARD, S3 and NEDA.
PARIS will facilitate a diverse Physics programme with both stable and radioactive beams. This programme will include studies of giant dipole resonances (GDR) and reaction dynamics. In particular, it will address exotic shape transition phenomena at high angular momentum, such as the Jacobi transition. Other Physics programmes are foreseen covering diverse topics from Coulomb excitation to heavy ion radiative capture and nuclear astrophysics.

Campaigns of experiments with PARIS will be pursued primarily at GANIL/SPIRAL2 (Caen, France), but the device would be eminently portable and could be used at other European and international RIB and stable ion-beam facilities.





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