Speaker
Description
Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, 28006, Madrid, Spain
Instituto de Física, Universidad Nacional Autónoma de México, 04510, Mexico City, Mexico.
email: luis.acosta@csic.es, acosta@fisica.unam.mx
Starting the present century, we found in the silicon strip detectors a unique opportunity to reach relevant results regarding the structure and dynamics of weakly bound nuclei and exotic nuclei, particularly, those called halos, where valence neutrons or protons are tremendously separated from a central core.
The common difficulties to produce exotic nuclei in different accelerators and using different methods lay in low beam current productions. Thus, it can be considered as normal, to measure currents of tens and hundreds of exotic particles, interacting with a target. The measure of scattering and reactions in this regime is a challenge, requiring systems with the capability to cover the biggest part of the processes that are occurring. At the same time, the angular discrimination is also important, considering the reaction kinematics.
The silicon strip detectors have been, without place to doubt, the best alternative to cover a large solid angle, and at the same time, solve the scattering angle. Their large active area and its segmentation makes possible to cover a bigger solid angle sections with the same device, permitting simultaneously have every time information about the position either the scattered particle or the particle produced by a reaction.
Single-Side and Double-Sided silicon strip detectors, can be used interchangeably and according to what information is required. One of the advantages of Double-Sided is the possibility to form pixels, increasing potentially the granularity of the active area. Combining strip detectors among them, with PAD’s or CsI(Tl) crystals, open a wide window of possibilities building “telescopes”. Nevertheless, not everything is bright with strip detectors: the analysis is always a difficult task, considering common problems as channeling, charge sharing, cross talk, dead-layers, complicated mounting, fragile package, and of course, the usual expensive price.
In the present talk, the good advantages and common problems to face up when silicon strip detectors are in action, will be detailed by using good examples of successful arrays, such as DINEX, GLORIA, FARCOS, SIMAS, and some derivations from them.
