Thesis (Ph.D.)--Tufts University, 2000. / Adviser: Austin Napier. Submitted to the Dept. of Physics. Includes bibliographical references (leaves 139-143). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 97-103).

This thesis investigates the possibility of constructing theories of composite particles of zero mass. Consideration is given primarily to the transformation properties of state vectors and operators used for the description of mass-less elementary particles under Lorentz transformation of the coordinate system. A method originally used by Wigner is developed more explicitly. The transformation properties of bilinear combinations of state functions and of operators are considered in some detail. It is found that the one example of a composite particle theory extant in the literature has incorrect transformation properties. No example of a correctly transforming theory is given. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Thesis (Ph. D. in Chemistry)--University of California, Berkeley, June 1958. / Includes bibliographies : p. 101-105.

No description available.

No description available.

The level structures of some single closed shell nuclei (⁸⁷₃₇Rb₅₀ and ⁸⁸₃₈Sr₅₀) and nearly closed shell nuclei (⁸⁷₃₈Sr₄₉ and ⁸⁸₃₇Rb₅₁) have been determined by means of beta decay processes of ⁸⁷Kr, ⁸⁸Kr and ⁸⁸Rb to final states ⁸⁷Rb, ⁸⁸Rb and ⁸⁸Sr respectively, and by means of the thermal neutron capture reaction on strontium (⁸⁶Sr(n,ɣ)⁸⁷Sr and ⁸⁷Sr(n,ɣ)⁸⁸Sr). The gamma radiation was studied using a Ge(Li) spectrometer and a Ge(Li)-NaI(Tl) coincidence spectrometer. Beta groups were identified using a plastic scintillator and a plastic-NaI(Tl) coincidence spectrometer. Spins and parities were determined for some of the levels from the deduced decay schemes. / Thesis / Doctor of Philosophy (PhD)

L’évaluation des masses atomiques (Ame), commencée dans les années 1960, est la source la plus fiable d’informations complètes sur les masses atomiques. Elle fournit les meilleures valeurs pour les masses atomiques et les incertitudes associées en évaluant les données expérimentales de désintégration, de réactions et de la spectrométrie de masse. Dans cette thèse, la philosophie et les caractéristiques les plus importantes de l’Ame seront discutées en détail. Les développements les plus récents de l’évaluation, AME2016, tels que l’énergie de liaison moléculaire, la correction d’énergie des mesures par implantation, et la formule relativiste pour le processus de décroissance alpha, seront présentés. Une autre partie de cette thèse concerne l’analyse des données du spectromètre à piège de Penning ISOLTRAP au ISOLDE/CERN. Les nouveaux résultats sont inclus dans l’ajustement global et leurs influences sur les masses existantes sont discutées. La dernière partie de cette thèse porte sur les études des erreurs systématiques du spectromètre de masse à multi-réflexion à temps de vol d’ISOLTRAP, utilisant une source d’ions hors ligne et le faisceau de protons en ligne. A partir de l’analyse des mesures sélectionnées, j’ai trouvé que l’erreur systématique est beaucoup plus faible que les incertitudes statistiques obtenues jusqu’à présent. / The Atomic Mass Evaluation (AME), started in the 1960s, is the most reliable source for comprehensive information related to atomic masses. It provides the best values for the atomic masses and their associated uncertainties by evaluating experimental data from decay, reactions, and mass spectrometry. In this thesis, the philosophy and the most important features of the Ame will be discussed in detail. The most recent developments of the latest mass table (AME2016), such as molecular binding energy, energy correction of the implantation measurements, and the relativistic formula for the alpha-decay process, will be presented. Another part of this thesis concerns the data analysis from the Penning-trap spectrometer ISOLTRAP at ISOLDE/CERN. The new results are included in the global adjustment and their influences on the existing masses are discussed. The last part of this thesis is related to the systematic error studies of the ISOLTRAP multi-reflection time-of-flight mass spectrometer, using an off-line ion source and the on-line proton beam. From the analysis of the selected measurements, I found that the systematic error is much smaller than the statistical uncertainties obtained up to now.

Masses have been determined by means of new mass spectrographic comparisons for the nuclides Zn66, Zn67, Zn68 and Ni58. The values obtained are compared with earlier ones from another laboratory. Mass differences have been obtained, which, together with those from nuclear reaction experiments, provide a basis for the adjustment of former mass values. These adjustments have lead to better agreement between mass determinations and nuclear disintegration data. / Thesis / Master of Science (MSc)

Doctorat en sciences, Spécialisation physique / info:eu-repo/semantics/nonPublished