A method for achieving good position resolution of low-intensity electron signals using a microchannel plate resistive anode detector is demonstrated. Electron events at a rate of 7 counts s(-1) are detected using a Z-stack microchannel plate. The dependence of position resolution on both the distance and the potential difference between the microchannel plate and resistive anode is investigated. Using standard commercial electronics, a measured position resolution of 170 μm (FWHM) is obtained, which corresponds to an intrinsic resolution of 157 μm (FWHM).
We report the first measurement of the fusion excitation functions for 39,47 K + 28 Si at nearbarrier energies. Evaporation residues resulting from the fusion process were identified by direct measurement of their energy and time-of-flight with high geometric efficiency. At the lowest incident energy, the cross-section measured for the neutron-rich 47 K induced reaction is ∼6 times larger than that of the β-stable system. This experimental approach, both in measurement and analysis, demonstrates how to efficiently measure fusion with low-intensity, re-accelerated radioactive beams, establishing the framework for future studies.
Digital signal processing techniques were employed to investigate the joint use of charge division and risetime analyses for the resistive anode (RA) coupled to a microchannel plate detector (MCP). In contrast to the typical approach of using the relative charge at each corner of the RA, this joint approach results in a significantly improved position resolution. A conventional charge division analysis utilizing analog signal processing provides a position measured resolution of 170 µm (FWHM). By using the correlation between risetime and position we were able to obtain a measured resolution of 92 µm (FWHM), corresponding to an intrinsic resolution of 64 µm (FMHM) for a single Z-stack MCP detector.
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