Abstract
The european Fazia collaboration aims at building a new modular array for charged product identification to be employed for heavy-ion studies. The elementary module of the array is a Silicon-Silicon-CsI telescope, optimized for ion identification including pulse shape analysis, too. The achievement of top performances imposes specific electronics which has been developed by the FAZIA collaboration and includes high quality charge and current preamplifiers, coupled to fully digital front-end. During the initial R&D phase, original and novel solutions have been tested in prototypes, obtaining unprecedented ion identification capabilities. FAZIA is now constructing a demonstrator array consisting of about two hundreds telescopes arranged in a compact and transportable configuration. In this contribution, we mainly summarize some aspects studied by FAZIA to improve the ion identification. Then we will briefly discuss the FAZIA program focused on experiments to be done with the demonstrator. First results on the isospin dynamics obtained with a reduced set-up demonstrate well the performance of the telescope and represent a good starting point towards future investigations with both stable and exotic beams.
Highlights
The studies of the reaction mechanisms occurring in heavy ion collisions have been recently focused on observables related to the isospin1 content of the system
FAZIA started a research program to optimize the detectors in terms of isotopic identification and, after that, to construct a modular array with state-of-the-art performances that will be used for heavyion experiments with both stable and radioactive ion beams, such as those to be delivered by SPES (LNL), SPIRAL2 (GANIL) and FRIBS (LNS) facilities
FAZIA recently performed an experiment using a standard silicon telescope where the first 300 μm silicon was kept at the usual voltage while the following 500 μm detector was operated at several voltages, from the nominal depletion (290 V) to a very low value (105 V), the latter corresponding to an undepleted layer of 200 μm; in this condition, this second detector could behave as a 300 μm silicon with an initial undepleted layer
Summary
The studies of the reaction mechanisms occurring in heavy ion collisions have been recently focused on observables related to the isospin content of the system. Such observables allow to access the isovector term of the nuclear potential, whose behaviour is poorly known for nuclei far from groundstate conditions. The detector frontier has become the isotopic identification of fragments in a wide range of kinetic energies and over large solid angles [9,10,11] Keeping this in mind, some years ago the european FAZIA collaboration was born from a previous cooperation among groups involved in this research field at several laboratories. FAZIA started a research program to optimize the detectors in terms of isotopic identification and, after that, to construct a modular array with state-of-the-art performances that will be used for heavyion experiments with both stable and radioactive ion beams, such as those to be delivered by SPES (LNL), SPIRAL2 (GANIL) and FRIBS (LNS) facilities
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