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Investigation of 234U(n,f) with a Frisch-grid ionization chamber
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
2011 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

This work treats three topics. The main topic concerns neutron-induced fission of 234U. The main goal is to investigate the fission-fragments properties  as a function of the incident neutron energy. The study was carried out using a twin Frisch-grid ionization chamber. The first fluctuations on fragment properties are presented, in terms of strong angular anisotropy oscillation.

The second part of the work treats the data-acquisition systems in use, particularly for neutron-induced fission experiments. Modern digital systems are studied and compared with the conventional analogue systems. It was shown that the digital systems are superior in drift stability, pile-up correction and extended the possibilities of offline analysis.

The third part of the work concerns the Frisch-grid inefficiency. The Frisch grid was introduced in the chamber to remove the angular dependency from the induced charge. However, the shielding is not perfect and a correction is needed for the small angular dependency. Two contradicting methods have been presented in literature, one adding, and the second subtracting the angular-dependent part from the detected signal. An experiment with Cf(sf) was designed and performed to solve the pending ambiguity. The results support the additive model.

Place, publisher, year, edition, pages
Uppsala: Department of Physics and Astronomy, Uppsala University , 2011. , p. 38
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-142440OAI: oai:DiVA.org:uu-142440DiVA, id: diva2:387378
Presentation
2011-01-20, Ångström laboratory, room 12167, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2011-01-17 Created: 2011-01-14 Last updated: 2011-01-17Bibliographically approved

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CiteExportLink to record
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  • apa
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