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HK: Fachverband Hadronen und Kerne

HK 19: Accelerators and Instrumentation II

HK 19.7: Talk

Monday, March 16, 2009, 18:30–18:45, H-ZO 90

Fission-fragment timing with poly-crystalline diamond detectors — •Stephan Oberstedt¹, Ruxandra Borcea¹, Franz-Josef Hambsch¹, Andreas Oberstedt², Wouter Geerts¹, and Marzio Vidali¹ — ¹European Commission JRC-IRMM, B-2440 Geel — ²Örebro University, S-70182 Örebro

For the investigation of prompt and delayed neutron emission in neutron-induced fission the two-arm time-of-flight spectrometer VERDI for high resolution fission-fragment spectrometry is being built at the Institute for Reference Materials and Measurements (IRMM). The ultimate goal is to achieve a mass resolution A/ΔA ≈ 120 in conjunction with a reasonable counting efficiency. One pre-requisite for such a device is the use of ultra-fast timing detectors, which may be operated at high radiation doses. For this purpose poly-crystalline chemical vapour deposited (pcCVD) diamond detectors have been tested for the first time as time pick-up for binary fission fragments. This type of detectors has demonstrated radiation hardness against a mix of alpha-particles, fission-fragments and prompt fission neutrons at radiation doses typically achieved during one fission experiment. For a 1 × 1 cm² large and 100 µm thick pcCVDD detector an intrinsic timing resolution better than 300 ps has been obtained. Present limitations and possible improvements will be discussed.