Pulse-shape analysis of signals from monolithic silicon EE–ΔEΔE telescopes produced by the quasi-selective epitaxy

Two monolithic EE–ΔEΔE charged particle telescopes with ΔEΔE layers of 11 and 20μm thick, respectively, produced with the Quasi-Selective Epitaxy method were tested at the Heavy Ion Laboratory in Warsaw.Thorium source αα-particles and 12C(14N,X) reaction products at 80 MeV beam energy were used. During on-beam tests, detectors were placed at 20∘20∘ laboratory angle with respect to the beam axis. Among the reaction products, ions of Li, Be, B, C, N, O, F were identified (using the telescope with 20μmΔE layer).Pulses from both EE and ΔEΔE components of the telescope were digitalized with a digital oscilloscope, sent to a PC machine and recorded. Pulse shape analysis technique was then applied to obtain the final two dimensional spectrum.The EE–ΔEΔE two-dimensional scatter plots obtained after irradiation of the monolithic EE–ΔEΔE telescopes by αα-particles from the calibration source are presented. The energy resolution of the monolithic EE–ΔEΔE telescope measured using αα-particles was about 0.7 MeV for telescope with 20μm thick ΔEΔE layer and 0.4 MeV for telescope with 11μmΔE layer.Response of the monolythic EE–ΔEΔE telescopes for Po212 8.78 MeV αα-particles registered at different impact positions at the telescope face was measured.Cross-talk signals in the monolithic EE–ΔEΔE telescope as a function of position and the ΔEΔE detector capacitance were simulated using the numerical solution of the telegraphic equation describing time-dependent evolution of the cross-talk potentials in the ΔEΔE detector RC network.