Cross-section studies of deuteron reactions and application in light element ion beam analysis techniques

Ντέμου, Ελένη; Ntemou, Eleni

dc.contributor.author	Ντέμου, Ελένη	el
dc.contributor.author	Ntemou, Eleni	en
dc.date.accessioned	2020-11-30T17:59:36Z
dc.date.available	2020-11-30T17:59:36Z
dc.date.issued	2020-11-30
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/52105
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.19803
dc.rights	Default License
dc.subject	Δευτέρια	el
dc.subject	Ελαστική σκέδαση	el
dc.subject	Ελαφρά στοιχεία	el
dc.subject	Θεωρία R-matrix	el
dc.subject	Έλεγχος αξιοπιστίας	el
dc.subject	Deuterons	en
dc.subject	Light elements	en
dc.subject	Elastic scattering (d-EBS)	en
dc.subject	R-matrix theory	en
dc.subject	Benchmarking	el
dc.title	Cross-section studies of deuteron reactions and application in light element ion beam analysis techniques	en
dc.title.alternative	Μελέτη ενεργών διατομών αντιδράσεων δευτερίων και εφαρμογή σε ιοντικές τεχνικές ανάλυσης ελαφρών στοιχείων	el
dc.contributor.department	Department of Physics	el
heal.type	doctoralThesis
heal.classification	Πυρηνική Φυσική	el
heal.classification	Nuclear Physics	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2020-02-05
heal.abstract	Ion Beam Analysis (IBA) techniques are universally used for analyzing elements and/or isotopes in the near-surface region of solids. More specifically, the implementation of such techniques includes the measurement of the number and the energy distribution of ions scattered from atoms in the near-surface layers of solid materials, and it provides a simple quantitative analysis, or it determines the depth profile of target elements. In the field of material analysis, in order for such results to be obtained via IBA techniques, the a priori knowledge of the corresponding differential cross section values is essential. However, the analytical calculation of the differential cross section values, for beam energies in the MeV range, is impossible since the physics concerning the interaction of the beam-target nucleons is only partially known. Therefore, the application of such analytical techniques is based on the existence of the corresponding experimental datasets in the literature. At the same time, light elements find numerous technological applications in the industry. They are crucial in the field of material analysis due to their presence in ceramics, glasses, and polymers, while they are also frequently added in metallic alloys in order to improve their corresponding properties, such as, hardness, wear and heat resistance, or rigidity. Consequently, the accurate quantitative determination of light-element depth profile concentrations in a variety of matrices is of paramount importance in contemporary science and technology. Such information, concerning light elements, can be acquired via the implementation of IBA (Ion Beam Analysis) techniques and more specifically via ERDA (Elastic Recoil Detection Analysis), for ultra-thin surficial layers and NRA (Nuclear Reaction Analysis) due to the production of isolated peaks (high Q-values involved) with negligible background. At the same time, the use of a deuteron beam provides high depth resolution, deep layer analysis and allows for the simultaneous study of practically all the main light isotopes and/or elements coexisting in a target. The implementation of d-NRA could be further enhanced if one could also coherently analyze the elastic scattering spectra which are simultaneously acquired using the same experimental conditions. However, the general applicability of d-EBS is still limited nowadays, mostly because of the lack of reliable and coherent datasets of differential cross-sections in the literature for energies and angles suitable for IBA. Hence, the contribution of the present thesis in the field of IBA is a comprehensive review of the differential cross section values of the deuteron elastic scattering on many important stable light elements and isotopes, such as 6Li, 7Li, 9Be, 14N, natO, 23Na and natSi, at energies and angles suitable for analytical purposes. In several cases (natO, 23Na, natSi) the obtained differential cross-section datasets are also benchmarked using thick targets of known and accurate stoichiometry. All measurements were carried out at the 5.5 MV Tandem Accelerator of N.C.S.R. “Demokritos” in Athens, Greece. The experimental setup consisted of a high-precision goniometer, along with six silicon surface barrier (SSB) detectors (500 μm in thickness). Most of the obtained datasets are already available in IBANDL (Ion Beam Analysis Nuclear Data Library [38]) under the International Atomic Energy Agency auspices, in order to be used by the scientific community in basic research problems, as well as in technological applications in the field of material analysis. Last but not least, in the context of the present thesis, the measured differential cross section values of the deuteron elastic scattering on oxygen were accompanied by theoretical calculations in order to extend the existing evaluation to higher deuteron beam energies. The theoretical calculations were accomplished in the framework of the R-matrix theory which is the most appropriate theoretical approach for calculating differential cross sections for resonant elastic scattering processes. The R-matrix theory takes into account the interaction of the projectile with the nucleus as a whole and the parameters of the used model were adjusted to the measured differential cross section values.	en
heal.sponsor	«This research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning» in the context of the project “Strengthening Human Resources Research Potential via Doctorate Research” (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ)»	en
heal.sponsor	«Το έργο συγχρηματοδοτείται από την Ελλάδα και την Ευρωπαϊκή Ένωση (Ευρωπαϊκό Κοινωνικό Ταμείο) μέσω του Επιχειρησιακού Προγράμματος «Ανάπτυξη Ανθρώπινου Δυναμικού, Εκπαίδευση και Διά Βίου Μάθηση», στο πλαίσιο της Πράξης «Ενίσχυση του ανθρώπινου ερευνητικού δυναμικού μέσω της υλοποίησης διδακτορικής έρευνας» (MIS-5000432), που υλοποιεί το Ίδρυμα Κρατικών Υποτροφιών (ΙΚΥ)»	el
heal.advisorName	Κόκκορης, Μιχαήλ	el
heal.advisorName	Kokkoris, Michael	en
heal.committeeMemberName	Gurbich, A.F.	en
heal.committeeMemberName	Bogdanovic-Radovic, I.	en
heal.committeeMemberName	Mayer, M.	en
heal.committeeMemberName	Patronis, N.	en
heal.committeeMemberName	Kokkoris, Michael	en
heal.committeeMemberName	Lagoyannis, A.	en
heal.committeeMemberName	Vlastou-Zanni, R.	en
heal.academicPublisher	Σχολή Εφαρμοσμένων Μαθηματικών και Φυσικών Επιστημών	el
heal.academicPublisherID	ntua
heal.numberOfPages	245 σ.	el
heal.fullTextAvailability	false