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Artificial diamonds as radiation-hard detectors for ultra-fast fission-fragment timing
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2013 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 714, p. 31-37Article in journal (Refereed) Published
Abstract [en]

In the framework of the construction of the double time-of-flight spectrometer VERDI, where we aim at measuring pre- and post-neutron masses directly and simultaneously, ultra-fast time pick-up detectors based on artificial diamond material were investigated for the first time with fission fragments from Cf-252 (0.5 MeV/u < E/A < 2 MeV/u). Signal stability under a high radiation fluence was determined up to at least 10(9) fission-fragments/cm(2) together with more than 3.5 x 10(9) neutrons/cm(2) and 3 x 10(10) alpha-particles/cm(2). This fluence is characteristic for fission experiments. The pre-requisite for the observed signal stability is the application of priming of the diamond material with a strong beta-source for about 48 h. The intrinsic timing resolution of a 100 mu m thick polycrystalline CVD diamond detector with a size of 1 x 1 cm(2) was determined to sigma(int) = (283 +/- 41) ps by comparison with Monte-Carlo simulations. Using broadband pre-amplifiers, 4-fold segmented detectors of same total size and with a thickness of 180 mu m show an intrinsic timing resolution of sigma(int) = (106 +/- 21) ps. This is highly competitive with the best micro-channel plate detectors. Due to the limited and batch-dependent charge collection efficiency of poly-crystalline diamond material, the detection efficiency for fission fragments may be smaller than 100%.

Place, publisher, year, edition, pages
2013. Vol. 714, p. 31-37
Keyword [en]
Fission fragment spectroscopy, Timing resolution, Artificial diamond, Chemical vapor deposited diamond, Time of flight
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-29961DOI: 10.1016/j.nima.2013.02.029ISI: 000319251800006OAI: oai:DiVA.org:oru-29961DiVA, id: diva2:635640
Available from: 2013-07-05 Created: 2013-07-05 Last updated: 2017-12-06Bibliographically approved

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Oberstedt, Andreas
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School of Science and Technology
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