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Implementation and characterization of Silicon detectors for studies on neutron-induced nuclear reactions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Energy resolution characteristics of silicon surface barrier detector signals amplified by different preamplifiers and spectroscopic amplifiers have been studied. The characterization has been done using alpha particles from an 241Am source and spontaneous fission fragments from two Cf sources. The alpha and spontaneous fission activities of the sources have been measured and the isotopic compositions, ages, and initial activities of the two Cf sources have been calculated using the results from the activity measurements. 82.3% and 82.5% of the spontaneous fission activity of the two sources is found to originate from 252Cf. Heavy ion detection properties of two Si detector setups have been determined by measuring spontaneous fission fragments from one of the Cf sources in coincidence. The mass distribution of fission fragments is derived from the pulse spectra of the coincidence measurements. The conditions for future time resolution measurements have been established.

Inquiries on commercially available ultra-thin Si detectors have been made. The purpose is to upgrade detector telescopes to lower the energy threshold of ΔE-ΔE-E identification of particles from neutroninduced nuclear reactions. Three manufacturers of Si detectors with thickness 20-25 µm and active area around 450 mm2 have been listed together with properties of the three offered detectors.

Place, publisher, year, edition, pages
2019. , p. 48
Series
UPTEC F, ISSN 1401-5757 ; 19047
Keywords [en]
Silicon detector, Silicon telescope, Ultra-thin silicon detector, Energy resolution, Radioactive source, Am-241, Cf-252, Fission Fragments, Alpha Particles
National Category
Other Physics Topics Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-389466OAI: oai:DiVA.org:uu-389466DiVA, id: diva2:1337491
Educational program
Master Programme in Engineering Physics
Supervisors
Examiners
Available from: 2019-08-06 Created: 2019-07-15 Last updated: 2019-10-10Bibliographically approved

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Applied Nuclear Physics
Other Physics TopicsOther Electrical Engineering, Electronic Engineering, Information Engineering

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CiteExportLink to record
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