Afarideh, Hossein (1988). A study of fission in \(^{238}\)U induced by Monoenergetic neutrons and heavy ions and of light particle emission in \(^{252}\)Cf spontaneous fission. University of Birmingham. Ph.D.
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Afarideh1988PhD.pdf
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Abstract
Fission yield measurements are important for many aspects of applied and basic nuclear physics.
The First chapter gives a brief introduction to the fission yield data and their importance to reactor technology. This chapter also explains the aims of the research project.
In the Second chapter the basic concepts of fission, properties of fission process and finally ternary fission are discussed in detail.
Chapter Three deals with the explanation of different fission yields and describes techniques available for the determination of binary fission yield as well as existing methods for the measurement or calculation of total fission products.
Chapter Four relates to the calibration of detectors used during the course of this project. The measurements of absolute and intrinsic efficiency of the two HP-Ge detectors are described in this chapter. Also, the comparative calibration of a Parallel Plate Fission Chamber (PPC) relative to an absolutely calibrated Harwell Fission Chamber is discussed here.
Chapter Five describes the measurements of cumulative fission yields of about 32 fission products for 5 different neutron energy ranges in \(^{238}\)U, using direct gamma-ray techniques. These yields were measured by the absolute method. From the measured fission yield data for different monoenergetic neutrons, predictions were made for the yield of fission products from reactor neutrons having a Watt spectrum.
Chapter Six is related to the measurements of alpha and triton yields in the ternary fission of monoenergetic-neutron-induced fission in \(^{238}\)U at two different neutron energies, using a ΔE-E telescope technique. In addition, we describe the energy spectrum and emission probability of tritons and alpha particles in Cf-252 which were determined by the telescope technique as well as using Solid State Nuclear Track Detectors (SSNTDs).
Chapter Seven deals with the angular distribution of fission fragments, in the neutron induced fission of \(^{238}\)U, with 1-19 MeV neutrons, as registered in Lexan and Mica detectors. This energy range covers first-, second- and third chance fission. The variation between theoretical predictions and experimentally measured values for angular distribution are also discussed here.
In Chapter Eight, interactions of some heavy projectiles, including 14 MeV/amu beams of \(^{238}\)U, with gold targets are studied, using Mica and CR-39 detectors. The measured cross sections for binary, ternary and quaternary fission are also reported. In addition, the quarter point angle for the interaction of several heavy ions with gold target were determined and used in calculations of elastic scattering cross-sections.
Finally chapter Nine discusses the conclusions and suggestions for further work.
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
| Supervisor(s): |
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Faculties (to 1997) > Faculty of Science | |||||||||
| School or Department: | Department of Physics | |||||||||
| Funders: | Other | |||||||||
| Other Funders: | Atomic Energy Organization of Iran | |||||||||
| Subjects: | Q Science > QC Physics | |||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/14167 |
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