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Investigation of 23...
Investigation of 234U(n,f) with a Frisch-grid ionization chamber
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- Al-Adili, Ali (författare)
- Uppsala universitet,Tillämpad kärnfysik
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- Hambsch, Franz-Josef (preses)
- Institute for Reference Materials and Measurements, Joint Research Centre - European Commission, Geel, Belgium
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- Pomp, Stephan (preses)
- Uppsala universitet,Tillämpad kärnfysik
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- Brenner, Richard, Prof. (opponent)
- Uppsala universitet,Högenergifysik
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(creator_code:org_t)
- Uppsala : Department of Physics and Astronomy, Uppsala University, 2011
- Engelska 38 s.
- Relaterad länk:
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Physics
- Fysik
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