Study of the fission cross-section of 230Th at the CERN n_TOF facility

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dc.contributor.author Μιχαλοπούλου, Βεατρίκη el
dc.contributor.author Michalopoulou, Veatriki en
dc.date.accessioned 2022-09-08T08:19:42Z
dc.date.available 2022-09-08T08:19:42Z
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/55629
dc.identifier.uri http://dx.doi.org/10.26240/heal.ntua.23327
dc.rights Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/gr/ *
dc.subject fission en
dc.subject 230Th el
dc.subject nTOF el
dc.subject cross-secrtion el
dc.title Study of the fission cross-section of 230Th at the CERN n_TOF facility en
dc.contributor.department Physics el
heal.type doctoralThesis
heal.secondaryTitle Μελέτη της ενεργού διατομής σχάσης του 230Th στα πλαίσια του πειράματος n_TOF στο CERΝ (el) el
heal.classification Nuclear Physics en
heal.language el
heal.language en
heal.access free
heal.recordProvider ntua el
heal.publicationDate 2021-10
heal.abstract Accurate data on neutron induced reactions on actinides is of considerable importance for the design of advanced nuclear systems and alternative fuel cycles. Specifically, 230Th is present in the thorium cycle produced from the decay of 234U. Thus, knowledge of the 230Th(n,f) reaction cross-section is strongly required. However, few experimental datasets exist in literature with large deviations among them, covering the energy range between 0.2 to 25 MeV. In addition, the study of fission cross-sections is of great interest in the research of the fission process related to the structure of the fission barriers. In the case of the thorium isotopes, narrow resonances and fine structures appear in the threshold region of the fission cross-section, known as the thorium anomaly. Specifically, previous measurements on the fission cross-section of 230Th revealed a main resonance at En =715 keV and additional fine structures, but with high discrepancies among the measured cross-section values. The scope of this work is to provide cross-section data for the 230Th(n,f) reaction, covering a wide energy range from the fission threshold up to 400 MeV. For this reason the experiment was performed in both experimental areas EAR-1 and EAR-2 of the CERN n_TOF facility. Seven high purity targets of the natural, unstable but very rare isotope 230Th, were produced at JRC-Geel in Belgium. The experimental setup was based on Micromegas detectors, while the 235U(n,f) cross-section was used as reference. A detailed description of the experimental setup, the analysis procedure, starting from the raw data to the final cross-section results, including the Monte-Carlo simulations performed and the theoretical study of the 230Th(n,f) reaction with the EMPIRE code are presented. en
heal.advisorName Βλαστού, Ρόζα el
heal.committeeMemberName Βλαστού, Ρόζα el
heal.committeeMemberName Κόκκορης, Μιχαήλ el
heal.committeeMemberName Πατρώνης, Νικόλαος el
heal.committeeMemberName Macina, Daniela
heal.committeeMemberName Colonna, Nicola
heal.committeeMemberName Σαββίδης, Ηλίας el
heal.committeeMemberName Διακάκη, Μαρία el
heal.academicPublisher Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Εφαρμοσμένων Μαθηματικών και Φυσικών Επιστημών el
heal.academicPublisherID ntua
heal.numberOfPages 105 σ. el
heal.fullTextAvailability false

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Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα Except where otherwise noted, this item's license is described as Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα