Total efficiency of a time-of-flight spectrometer from heavy ion elastic recoil detection

E. DE BARBARÁ; G. V. MARTÍ; A. ARAZI; O. A. CAPURRO; P. F. F. CARNELLI; J. O. FERNÁNDEZ NIELLO; J. M. FIGUEIRA; D. MARTÍNEZ HEIMANN; A. NEGRI; A. J. PACHECO; L. ZALAZAR

Havana

Simposio; XIII Workshop on Nuclear Physics - VII Interntaional Symposium on Nuclear and Related Techniques; 2011

CEADEN

The total efficiency of a time-of-flight system based on two micro-channel plates (MCP) time zero detectors plus a conventional silicon surface barrier detector was obtained from heavy ion elastic recoil measurements and the results are presented in this contribution. This TOF spectrometer is mainly devoted to the measurements of total fusion cross section of weakly bound projectiles on different mass-targets systems. As the total efficiency of a TOF spectrometer is strongly dependent on the energy and mass of the detected particles, we have based our efficiency measurements in the elastic scattering of beam-like particles of mass M≈30 (32S, 35-37Cl) on different targets trying to cover a wide range of the scattered particle energies with high degree of accuracy at the lowest energies. The different experimental detection efficiency curves obtained in that way were compared with theoretical electronic stopping power curves on carbon foils and were applied to obtain total fusion excitation functions for the systems 6,7Li+27Al at energies around and above the Coulomb barrier.