M. Cabibbo

A monolithic silicon detector telescope

Abstract An ultrathin silicon detector (1 μm) thick implanted on a standard 400 μm Si-detector has been built to realize a monolithic telescope detector for simultaneous charge and energy determination of charged particles. The performances of the telescope have been tested using standard alpha sources and fragments emitted in nuclear reactions with different projectile-target colliding systems. An excellent charge resolution has been obtained for low energy (less than 5 MeV) light nuclei. A multi-array lay-out of such detectors is under construction to charge identify the particles emitted in reactions induced by low energy radioactive beams.

Implanted silicon detector telescope: New developments

As a result of a collaboration between SGS-Thomson and INFN, a Monolithic Silicon Detector Telescope with *E/E of 4] 4m m 2with an ultra-thin *E stage (1 lm) has been recently presented as a tool to identify low-energy heavy ions. The good performances obtained in the charge identification are anyway limited by the relatively small active area. We report on two new larger area *E/E telescopes. The first one, a five strip detector with each *E strip 3] 4m m 2and a common E stage, has given on-beam good results. The second one, a 20]20 mm2 active area, is under test and is limited by the high capacitance of the *E stage (40 nF) requiring a suitable front-end electronics, presented in a di⁄erent communication. ( 1998 Elsevier Science B.V. All rights reserved.

Different aspects of nuclear structure and reaction mechanisms in the collision 13N+11B

The reaction N-13 + B-11 has been investigated at two 13N beam energies: 29.5 and 45 MeV, Charged particles and gamma rays emitted in the reactions have been detected using a large array of silicon strip detectors and BaF2 scintillators, respectively. Several reaction channels have been analysed with different aims. The proton transfer reaction B-11(N-13, C-12)C-12 to various excited states of C-12 has been studied to obtain information on the N-13(g.s.) structure. The excitation energy of the Mg-24 compound nucleus was in the region where several resonances occur in the C-12 + C-12 system. The six-alpha decay of the Mg-24 intermediate system has been studied. Some of these events have been identified as coming from the break-up of two C-12* in the 3(1)(-)-3(1)(-) and 3(1)(-)-0(2)(+) states. The total fusion cross section has also been extracted from the data. In order to extract information on the isospin purity/mixing in Mg-24 at high excitation energy (E-x similar to 47 MeV), the GDR gamma emission from this self-conjugate nucleus has been studied. A comparison of gamma spectra has been undertaken for the reactions N-13 + B-11 and N-14 + B-10

Formation and decay of 24Mg in the 13N+11B collision

Different aspects of the formation and decay of 24 Mg in the collision 13 N+ 11 B have been studied using a large solid angle and highly segmented Silicon strip detector. Results concerning the fusion cross section, the 6 α decay of 24 Mg and the GDR gamma ray emission are discussed.

Different aspects of 24Mg formation and decay using a radioactive 13N beam

Different aspects of the formation and decay of 24Mg in the collision 13N+11B have been studied using a large solid angle and highly segmented Silicon strip detector. Results concerning the fusion cross section, the 6 α decay of 24Mg and the GDR gamma ray emission are discussed.

Formation and decay of 24Mgin the 13N+11Bcollision

Different aspects of the formation and decay of 24 Mg in the collision 13 N+ 11 B have been studied using a large solid angle and highly segmented Silicon strip detector. Results concerning the fusion cross section, the 6 α decay of 24 Mg and the GDR gamma ray emission are discussed.

Formation and decay of {sup 24}Mg in the {sup 13}N+{sup 11}B collision

Different aspects of the formation and decay of 24 Mg in the collision 13 N+ 11 B have been studied using a large solid angle and highly segmented Silicon strip detector. Results concerning the fusion cross section, the 6 α decay of 24 Mg and the GDR gamma ray emission are discussed.