A New Uniform Calibration Method for Double-Sided Silicon Strip Detectors
We proposed and implemented a new uniform calibration approach for double-sided silicon strip detector, named the self-calibration method (SCM). This method uses the strips on one side of the detector as references, to calibrate the strips on the other side, and vice versa. This calibration method has the inherent advantages that it can be run during the experiment corresponding exactly to the required particle type and energy range, and provides good statistics based on flexible selection of the event samples. Two strategies based on the same working principle but with deferent complexities, named simple SCM and overall SCM, were introduced and examined experimentally. The simple SCM requires less computation but a large number of events, while the overall SCM exhibits excellent performance even with a relatively small number of events.
Investigation of the thickness non-uniformity of the very thin silicon-strip detectors
Abstract The properties of some very thin ( ∼ 20 μ m) large-area Single-sided Silicon-Strip Detectors (SSSDs) were investigated by using the 12C-particles elastically scattered from a Au target. In the detection system, each thin SSSD was installed in front of a thick (300 μ m or 500 μ m) Double-sided Silicon-Strip Detector (DSSD) to form a Δ E − E particle-telescope. The energy calibration of these detectors was realized by varying the beam energy and also by the irradiation from a three-component α -particle source. The thickness distribution each SSSD is precisely determined from the energy loss in the thin layer, which was independently measured by the corresponding DSSD. It is found that, for the SSSD with the nominal thicknesses of ∼ 20 μ m, the real thickness may vary by several μ m over the active area. The reason for this large non-uniformity still needs to be investigated. For the present application, this non-uniformity could be corrected according to the known pixel-thickness. This correction allows to restore a good particle identification (PID) performance for the entire large-area detector, the importance of which is demonstrated by an example of measuring the cluster-decays of the highly-excited resonant states in 16O.
Coulomb Effects in the Final State for Three-Body Reactions
A semiclassical Monte Carlo calculation has been performed which indicates that Coulomb forces among the final-state particles may significantly affect the angular distributions and directional-correlation functions for sequential reactions with three bodies in the final state.