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Characterization of Diamond and Silicon Carbide Detectors With Fission Fragments

Abstract : Experimental fission studies for reaction physics or nuclear spectroscopy can profit from fast, efficient, and radiation-resistant fission fragment (FF) detectors. When such experiments are performed in-beam in intense thermal neutron beams, additional constraints arise in terms of target-detector interface, beam-induced background, etc. Therefore, wide gap semi-conductor detectors were tested with the aim of developing innovative instrumentation for such applications. The detector characterization was performed with mass- and energy-separated fission fragment beams at the ILL (Institut Laue Langevin) LOHENGRIN spectrometer. Two single crystal diamonds, three polycrystalline and one diamond-on-iridium as well as a silicon carbide detector were characterized as solid state ionization chamber for FF detection. Timing measurements were performed with a 500-µm thick single crystal diamond detector read out by a broadband amplifier. A timing resolution of ∼10.2 ps RMS was obtained for FF with mass A = 98 at 90 MeV kinetic energy. Using a spectroscopic preamplifier developed at INFN-Milano, the energy resolution measured for the same FF was found to be slightly better for a ∼50-µm thin single crystal diamond detector (∼1.4% RMS) than for the 500-µm thick one (∼1.6% RMS), while a value of 3.4% RMS was obtained with the 400-µm silicon carbide detector. The Pulse Height Defect (PHD), which is significant in silicon detectors, was also investigated with the two single crystal diamond detectors. The comparison with results from α and triton measurements enabled us to conclude that PHD leads to ∼50% loss of the initial generated charge carriers for FF. In view of these results, a possible detector configuration and integration for in-beam experiments has been discussed.
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https://hal.archives-ouvertes.fr/hal-03394390
Contributor : Armelle Michetti Connect in order to contact the contributor
Submitted on : Friday, October 22, 2021 - 9:11:36 AM
Last modification on : Monday, October 25, 2021 - 9:06:31 AM

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M Gallin-Martel, Y Kim, L Abbassi, A Bes, C Boiano, et al.. Characterization of Diamond and Silicon Carbide Detectors With Fission Fragments. Frontiers in Physics, Frontiers, 2021, 9, pp.732730. ⟨10.3389/fphy.2021.732730⟩. ⟨hal-03394390v2⟩

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