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Dissertations / Theses on the topic 'Nuclear fission'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hormaza, Joel Mesa. "Estudo de propriedades nucleares em regime de deformação fora do equilíbrio." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-05122013-110600/.

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Foi desenvolvido, implementado e testado um formalismo que permite descrever propriedades nucleares em regimes de deformação fora do equilíbrio, utilizando o método Macroscópico-Microscópico em associação com o Método Semimicroscópico Combinado. Esse formalismo foi utilizado para a interpretação e elucidação de alguns problemas abertos como as estruturas na seção de choque de fotofissão do 237.ANTPOT Np, distribuições angulares de fotofissão do 239.ANTPOT. Pu, e a concentração de transições M1 no 237.ANTPOT Np e 239.ANTPOT. Pu em baixas energias. Também, foram interpretadas informações experim

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2

Belloni, Francesca. "Neutron induced fission cross section measurements aimed at nuclear technology development." Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3720.

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2008/2009<br>Neutron induced fission cross sections of 233U, 238U, 241Am, 243Am and 245Cm in the energy range between 500 keV and 20 MeV obtained at the n_TOF Neutron Time of Flight facility at CERN (Geneve) are presented. Fission fragments had been detected by a gas counter with good discrimination between nuclear fission products and background events. A comparison between the extracted cross sections, previous experimental results and evaluated libraries is reported.<br>In questa tesi sono presentate le sezoni d'urto indotte da neutroni di energia compresa tra 500 KeV e 20 MeV su 233U,

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3

Elmgren, Klas. "Experimental Fission Studies at Intermediate Energies." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2002. http://publications.uu.se/theses/91-554-5335-X/.

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4

Cantwell, Helena Rose. "Nuclear size control and homeostasis in fission yeast." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10054466/.

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Despite it being recognised as a problem worthy of consideration over a century ago, we have little mechanistic understanding of how the size of a cell’s nucleus is determined. The simply shaped fission yeast Schizosaccharomyces pombe is genetically tractable and undergoes a closed mitosis, making it a useful system in which to probe mechanisms of nuclear size control. In S. pombe cells, nuclear volume scales with cell volume, and not DNA content, across a wide range of cell volumes and throughout the cell cycle, maintaining a constant nuclear volume to cell volume (N/C) ratio. This thesis exp

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5

Gabro, Dany. "Virtual Studies of Nuclear Fission : A comparison of n- and p- induced fission using GEF." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324014.

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A General Description of Fission Observables (GEF) version 2016/1.2 is a software which simulates various types of fission. The main objective of this project is to compare the proton induced fission with the neutron induced fission of the same fissioning system. The proton induced fission was recently introduced to GEF and is relatively untested. Furthermore another task is to study the energy dependence in the same compound nucleus. The project will focus on simulating and comparing 238U(p,f) with 238Np(n,f) and 239Np*(f) as well as 232Th(p,f) with 232Pa(n,f) and 233Pa*(f ). The simulations

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6

EL-HAJJE, REFAAT Safety Science Faculty of Science UNSW. "A SIMULTANEOUS MEASUREMENT OF THE ANGULAR DISTRIBUTION, MASS AND KINETIC ENERGY OF 235U AND 232Th FISSION FRAGMENTS." Awarded by:University of New South Wales. School of Safety Science, 2000. http://handle.unsw.edu.au/1959.4/17612.

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Simultaneous measurements of the angular distribution, mass distribution and average total kinetic energy of fission fragments produced by the neutron-induced fission of 235U and 232Th have been made using a gridded ionisation chamber. The neutron energy range used was thermal to 1.9 MeV for 235U and 1.4 to 1.7 MeV for 232Th. The following topics were investigated: the interdependence of the fission fragment angular and mass distribution; the anomalous behaviour of fragment anisotropy for 235U(n,f) at neutron energies En below 150 keV; the possible existence of a third symmetric mass peak for

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7

Ananthanarayanan, Vaishnavi. "Dynein dynamics during meiotic nuclear oscillations of fission yeast." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-135620.

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Cytoplasmic dynein is a ubiquitous minus-end directed motor protein that is essential for a variety of cellular processes ranging from cargo transport to spindle and chromosome positioning. Specifically, in fission yeast during meiotic prophase, the fused nucleus follows the spindle pole body in oscillatory movements from one cell pole to the other. The three molecular players that are essential to this process are: (i) the motor protein dynein, which powers the movement of the nucleus, (ii) microtubules, which provide the tracts for the movement and (iii) Num1, the anchor protein of dynein at

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8

NALLO, GIUSEPPE FRANCESCO. "Modelling liquid metals for nuclear fusion and fission reactors." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2928622.

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9

Kingdon, David Ross. "Safety characteristics of a suspended-pellet fission reactor system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/NQ42856.pdf.

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10

Patel, N. M. "Speciation and separation of fission product rhodium." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/7406.

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The rhodium speciation in nitric acid has been identified, primarily by the use of 103Rh Nuclear Magnetic Resonance Spectroscopy. The results have indicated that the rhodium species in stored high level waste (HLW) will range from the hexaaquo ion, {Rh(H20)6}3+-to complexes of the general formula {Rh(H20)6-n(NO2)nl(3-n)+, depending on the nitrite ion concentration. The solvent extraction of these complexes by dinonylnaphthalene sulphonic acid and various organo-phosphine sulphides has been investigated, and an integrated scheme for recovering rhodium from HLW is proposed.

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11

Rêgo, Maria Eugênia de Melo. "Gestão dos rejeitos radioativos gerados na produção de 99Mo por fissão nuclear." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-16122013-113937/.

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O Brasil planeja construir uma planta de produção do 99Mo por fissão do 235U, devido à crescente utilização deste radioisótopo no setor de medicina nuclear. Neste trabalho buscou-se estimar as características físico-químicas e radiológicas dos rejeitos radioativos que serão gerados em tal instalação, além de fornecer subsídios teóricos a serem utilizados na definição do gerenciamento desses rejeitos. Estabelecidos dois cenários de produção para este projeto e utilizando-se o código Scale®, foram calculados os inventários radioisotópicos dos fluxos de rejeitos. Considerando-se o processamento q

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12

Scheffler, Kathleen. "Microtubule-dependent nuclear congression in fission yeast and a novel factor in cellular morphogenesis of fission yeast." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066510/document.

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(I) J'ai étudié les mécanismes contrôlant la congression des noyaux pendant la conjugaison de la levure S. pombe. A l'aide d'imagerie à long terme basée sur la microfluidique, j'ai mesuré la durée précise de la congression nucléaire et démontré que deux moteurs moléculaires des MTs, la dynéine et la kinésine-14 Klp2 contribuent à ce processus, dans des voies parallèles. La dynéine s’associe aux SPBs. Son niveau au SPB dépend de la chaine légère intermédiaire Dli1 qui pourrait potentiellement stabiliser le complexe dynéine et est requise pour la congression. Klp2 se localise sur les MTs. La loc

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13

Scheffler, Kathleen. "Microtubule-dependent nuclear congression in fission yeast and a novel factor in cellular morphogenesis of fission yeast." Electronic Thesis or Diss., Paris 6, 2014. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2014PA066510.pdf.

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(I) J'ai étudié les mécanismes contrôlant la congression des noyaux pendant la conjugaison de la levure S. pombe. A l'aide d'imagerie à long terme basée sur la microfluidique, j'ai mesuré la durée précise de la congression nucléaire et démontré que deux moteurs moléculaires des MTs, la dynéine et la kinésine-14 Klp2 contribuent à ce processus, dans des voies parallèles. La dynéine s’associe aux SPBs. Son niveau au SPB dépend de la chaine légère intermédiaire Dli1 qui pourrait potentiellement stabiliser le complexe dynéine et est requise pour la congression. Klp2 se localise sur les MTs. La loc

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14

Claisse, Antoine. "Open porosity fission gas release model applied to nuclear fuels." Licentiate thesis, KTH, Reaktorfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168502.

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Nitride fuels have gained a new interest in the last few years as both a candidate for GEN IV reactors and as accident tolerant fuels for current light water reactors. They however are decades behind oxide fuels when it comes to qualication and development of tools to assess their performances. In this thesis, such a tool is developed. The fuel performance codeTRANSURANUS, which has very good results with oxide fuels, is extended to handle nitride fuels. The relevant thermo-mechanical properties are implemented and fuel type dependent modules are updated. Their limitations and discrepancies ar

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15

CARON, DOMINIC. "Neutronics methods for the multiphysics analysis of nuclear fission systems." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2677635.

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The accurate representation of the overall behaviour of advanced nuclear fission systems, including both nuclear reactors and accelerator-driven subcritical systems, typically requires to account for the interactions among the various physical phenomena that occur in the complex system comprised by a nuclear reactor. Correspondingly, the numerical codes that are intended for application to the design and the analyses of such systems are required to couple individual physics models, perhaps most notably those for neutronics and thermal-hydraulics, as these two phenomena are of great importance

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16

BONIFETTO, ROBERTO. "Computational thermal-hydraulic modeling for nuclear fusion and fission applications." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2572946.

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Both nuclear fusion and fission devices have to face the issue of the cooling of some critical components, and in particular the cooling of the superconducting coils and of the core fuel assemblies, respectively. In order to investigate these issues during the design phase of new reactors, e.g. new tokamak experiments and the forthcoming Generation IV reactors, new dedicated models and reliable tools should be developed. In this work, two separate tools, for fusion and fission devices, respectively, are developed relying on the same quasi-3D thermal-hydraulic model, i.e. the 1D advection flow

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17

McParland, Brian James. "A study of the 6Li([pi]+,3He)3He reaction at 60, 80 and 100 MeV." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25934.

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An experimental study of the pion-induced fission, ⁶Li (π⁺, ³He) ³He, has been performed at TRIUMF using 60, 80 and 100 MeV pions. Angular distributions for this reaction at these energies, along with the energy dependence at fixed center-of-mass angles, are presented. Two theoretical models of this reaction predict widely differing angular and energy dependences. Prior to this experiment, the available data on the ⁶Li (π⁺, ³He) ³He reaction (and its inverse, ³He (³He, π⁺) ⁶Li) were insufficient to determine which of the two calculations better represent the reaction. The new data presented he

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18

Prokofiev, Alexander. "Nucleon-Induced Fission Cross Sections of Heavy Nuclei in the Intermediate Energy Region." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5009-1/.

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19

Leong, Lou Sai. "Fission fragment angular distribution and fission cross section validation." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00924483.

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The present knowledge of angular distributions of neutron-induced fission is limited to a maximal energy of 15 MeV, with large discrepancies around 14 MeV. Only 238U and 232Th have been investigated up to 100 MeV in a single experiment. The n_TOF Collaboration performed the fission cross section measurement of several actinides (232Th, 235U, 238U, 234U, 237Np) at the n_TOF facility using an experimental set-up made of Parallel Plate Avalanche Counters (PPAC), extending the energy domain of the incident neutron above hundreds of MeV. The method based on the detection of the 2 fragments in coinc

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20

IBRAHIM, Fadi. "Production et étude des fragments de fission, de LOHENGRIN à ALTO." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2005. http://tel.archives-ouvertes.fr/tel-00009789.

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L'étude des noyaux loin de la stabilité est constitutive de l'histoire de la physique nucléaire dès son origine, et connaît un essor considérable. Parmi les nucléides les plus éphémères, ceux situés aux frontières de notre connaissance sont qualifiés d' « exotiques ». Etudier ces noyaux, c'est se donner la chance d'accéder à des informations nouvelles sur la structure nucléaire et ainsi mesurer la solidité de notre conception de la matière nucléaire et sa validité lorsque cette dernière est poussée dans des états « extrêmes ». Le travail présenté dans cette habilitation à diriger des recherche

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21

Oberer, Richard B. "Fission multiplicity detection with temporal gamma-neutron discrimination from higher-order time correlation statistics." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17632.

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22

Todd, Jamie R. D. (James Robert Drysdale). "Angular distributions and kinetic energies of fission products from the 238U(12C,f) reaction." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59911.

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The angular anisotropy, $ omega$, of individual fission products produced from the $ sp{238} rm U( sp{12}$C, f) 119.9 MeV incident heavy-ion induced fission reaction, was modelled in terms of the angular momentum, l, conferred upon the intermediate nucleus. Evidence of incomplete momentum transfer led to a model treating fission products as being the result of two fission inducing processes: complete fusion resulting in compound nucleus formation, and an $ alpha$-transfer incomplete fusion process. The average angular anisotropies for each of the two processes were calculated to be, $ omega sb

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23

Fiorito, Luca. "Nuclear data uncertainty propagation and uncertainty quantification in nuclear codes." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/238375.

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Uncertainties in nuclear model responses must be quantified to define safety limits, minimize costs and define operational conditions in design. Response uncertainties can also be used to provide a feedback on the quality and reliability of parameter evaluations, such as nuclear data. The uncertainties of the predictive model responses sprout from several sources, e.g. nuclear data, model approximations, numerical solvers, influence of random variables. It was proved that the largest quantifiable sources of uncertainty in nuclear models, such as neutronics and burnup calculations, are the nucl

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24

Minoda, Akiko. "The role of fission yeast nuclear actin-related protein in mitosis." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1444847/.

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Nuclear actin-related proteins (Arps) have 20-30% identity to conventional actin and many are found to be in chromatin remodelling complexes. There are two families of chromatin remodelling complexes, one of which carries out covalent modification on histones such as acetylation. The other is an ATPase complex, which alters the nucleosomal spacing, and nuclear Arps are found in both complexes. These complexes are believed to be required for transcriptional activation by increasing the accessibility of the transcription machinery to the target DNA. The alp5-1134 mutant was isolated from a scree

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25

Hoffmann, S. M. A. "Fission/spallation competition in the de-excitation of '1'8'1RE." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233085.

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26

Martin, Jerry Lynn. "DABLE--a facility for measuring fission product transport in gas-cooled reactors." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13906.

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27

Edwards, Ellen. "Measurement of Krypton Fission Product Yields from 14 MeV Neutrons on 238U." Thesis, University of California, Berkeley, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10930784.

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<p>Precisely-known fission yield distributions are used to determine a fissioning isotope and the incident neutron energies in nuclear security applications. 14 MeV neutrons from DT fusion at the National Ignition Facility (NIF) induced fission in depleted uranium (DU) contained in the target assembly hohlraum. The fission yields of Kr isotopes (85m, 87, 88, 89, and 90) were measured relative to the cumulative yield of 88Kr. The fission gas was pumped from the target chamber, collected, and analyzed in the Radiochemical Analysis of Gaseous Samples (RAGS) diagnostic. Isotopes with half-lives ra

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28

Bagher, Nori Mohammad. "Derivation of the angular momentum of primary fission fragments from isomeric yield ratio by TALYS using Python." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-436869.

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The general fission process is well known and is applied in nuclear power plants all over the world. However many properties of fission fragments are still not well understood. The angular momentum distribution of fission fragments is an important property to gain a better understanding of the fission process, and that can be derived indirectly from isomeric yield ratios. The goal of this project has been to develop a script in Python that runs the nuclear reaction code TALYS with the Total Monte Carlo method to calculate the isomeric yield ratio. The script generates a matrix consisting of ex

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29

Bao, Xun. "Identifying the nuclear envelope receptor of Mto1 in fission yeast Schizosaccharomyces pombe." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28729.

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Microtubules are essential components of eukaryotic cytoskeleton and play a crucial role in variety of cell activities, such as cell mobility, intracellular transportation, cell division and organelle spatial organization. The initiation of microtubule nucleation is an important event to trigger the microtubule growth from different microtubule organizing centres (MTOCs) during the cell cycle in fission yeast. In interphase, the major MTOCs in the cells are nuclear envelope (NE) and microtubules existing in the cytoplasm. During mitosis, spindle pole body (SPB) that is the centrosome equivalen

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30

Ledesma, Michelle N. (Michelle Nicole) 1975. "Medical room design for a fission converter-based boron neutron capture therapy facility." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50533.

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31

Kiger, William Steadman. "Neutronic design of a fission converter-based ephithermal beam for neutron capture theory." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/39761.

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32

Sutharshan, Balendra 1966. "Engineering design of a fission converter-based epithermal beam for neutron capture therapy." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/49671.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1998.<br>Includes bibliographical references.<br>There is a need for high intensity and low contamination epithermal neutron beams, for boron neutron capture therapy research and for routine treatment if this becomes a successful modality for treating cancers. A fission converter based design for high performance epithermal neutron beam was developed at the Nuclear Reactor Laboratory of the Massachusetts Institute of Technology. This epithermal beam has the capability of delivering a treatment within minutes w

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33

Riley, Kent J. (Kent Jason). "Construction and characterization of a fission converter based epithermal neutron beam for BNCT." Thesis, Massachusetts Institute of Technology, 2001. https://hdl.handle.net/1721.1/123100.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2001.<br>Includes bibliographical references.<br>This study demonstrates the first successful implementation of a fission converter to produce a source of epithermal neutrons suitable for BNCT. The final design, construction and characterization of a new epithermal neutron beam is presented. A high intensity source with low contamination is obtained using a fission converter driven by thermal neutrons from the MIT research reactor. The facility is housed in the experimental hall and operates in parallel with

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34

Dobrowolski, Artur. "Influence of differences in the proton and neutron distributions on nuclear fusion and fission." Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/DOBROWOLSKI_Artur_2006.pdf.

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Dans ce travail de thèse des ingrédients essentiels pour la description théorique de la dynamique des réactions de fusion et fission nucléaires sont étudiés, tel que le potentiel d'interaction entre noyaux cible et projectile pour le processus de fusion et l'énergie de déformation dans un espace multidimensionnel pour la fission. Nous avons évalué en particulier l'importance de la différence des distributions de densités protons et neutrons. Pour le processus de fusion, le potentiel d'interaction entre les noyaux peut être déterminé à travers des densités obtenues d'une façon auto-consistante

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35

Dobrowolski, Artur Bartel Johann Pomorski Krzysztof. "Influence of differences in the proton and neutron distributions on nuclear fusion and fission." Strasbourg : Université Louis Pasteur, 2008. http://eprints-scd-ulp.u-strasbg.fr:8080/894/01/DOBROWOLSKI_Artur_2006.pdf.

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Thèse de doctorat : Physique Nucléaire Théorique : Strasbourg 1 : 2006. Thèse de doctorat : Physique Nucléaire Théorique : Université Marie Curie-Skłodowska de Lublin (Pologne) : 2006.<br>Thèse soutenue en co-tutelle. Titre provenant de l'écran-titre. Bibliogr. 5 p.

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36

De, Bona Emanuele. "Grain size effects on radiogenic Helium gas in the nuclear fuel UO2." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC084.

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Dû à l’environnement extrême dans lequel il est exploité, le combustible nucléaire présente des modifications des propriétés thermophysiques ainsi que microstructurales. En particulier se forme en périphérie de l’élément de combustible une structure appelée Structure Haut Burnup (HBS) caractérisée par la subdivision des grains originaux en grains d’environ 100 nm. Dans ce travail, la synthèse d’échantillons denses de UO2 et ThO2 avec des grains d’environ 100 nm a été réalisée. De tels matériaux permettront de faire des études à effets séparés sur l’impact de la HBS sur le comportement du combu

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37

Mauer, Andrew N. "A superconducting fusion transmutation of waste reactor." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15970.

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Andrews, Nathan Christopher. "Development of fission gas swelling and release models for metallic nuclear fuels." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76958.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 145-146).<br>Fuel swelling and fission gas generation for fast reactor fuels are of high importance since they are among the main limiting factors in the development of metallic fast reactor fuel. Five new fission gas and swelling modules for the fast reactor metallic fuel code FEAST-METAL were developed. This increases the number of degrees of freedom in the code and enhances the science -based modeling option

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39

Hunter, Jessica Lynn. "Improvements and applications of the Uniform Fission Site method in Monte Carlo." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95598.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 61-63).<br>Monte Carlo methods for reactor analysis have been in development with the eventual goal of full-core analysis. To attain results with reasonable uncertainties, large computational resources are needed. Variance reduction methods have been developed in order to reduce the computational resources required to obtain results in a practical amount of time. This work seeks to expand research in the

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40

Sweeney, David J. "Reactor power history from fission product signatures." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3209.

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41

Henning, Gregoire. "Stability of Transfermium Elements at High Spin : Measuring the Fission Barrier of 254No." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00745915.

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Super heavy nuclei provide opportunities to study nuclear structure near three simultaneous limits: in charge Z, spin I and excitation energy E∗. These nuclei exist only because of a fission barrier, created by shell effects. It is therefore important to determine the fission barrier and its spin dependence Bf(I), which gives information on the shell energy Eshell(I). Theoretical calculations predict different fission barrier heights from Bf(I = 0) = 6.8 MeV for a macro-microscopic model to 8.7 MeV for Density Functional Theory calculations using the Gogny or Skyrme interactions. Hence, a meas

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42

Gao, Wei Ph D. "Lithium-6 filter for a fission converter-based Boron Neutron Capture Therapy irradiation facility beam." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34653.

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Includes bibliographical references (p. 164-165).<br>Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2005.<br>(cont.) A storage system was designed to contain the lithium-6 filter safely when it is not in use. A mixed field dosimetry method was used to measure the photon, thermal neutron and fast neutron dose. The measured advantage depth is 9.3 ± 0.1cm without filter and 9.9 ± 0.1cm with 8mm lithium-6 filter. The result is consistent with the result of Monte Carlo calculation.<br>The design of a lithium-6 filter to be used in Boron Neutron Capture Therapy w

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Schmitt, Christelle. "Fission des Noyaux Lourds et Superlourds." Phd thesis, Université Louis Pasteur - Strasbourg I, 2002. http://tel.archives-ouvertes.fr/tel-00001529.

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Ce travail de thèse porte sur l'étude de la dynamique des réactions de fusion-fission sous ses aspects aussi bien théoriques qu'expérimentaux. Dans le cas de systèmes nucléaires fortement excités, nous décrivons la fission symétrique (seule présente à haute énergie) par un modèle macroscopique unidimensionnel basé sur la résolution de l'équation de Langevin couplée aux équations gouvernant l'évaporation de particules légères. Un accord satisfaisant entre prédictions théoriques et résultats expérimentaux de multiplicités de neutrons de pré-scission a alors été obtenu. A plus basse énergie la co

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Bourne, Geoffrey S. "Actinide and fission product activity variations in inter-tidal marine macrophytes." Thesis, Cardiff Metropolitan University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306854.

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Khan, Md Gulam Musawwir. "Nuclear import mechanism of Php4 under iron deprivation in fission yeast Schizosaccharomyces pombe." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6008.

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Php4 is a subunit of the CCAAT-binding protein complex that has a negative regulatory function during iron deprivation in the fission yeast Schizosaccharomyces pombe. Under low iron conditions, Php4 fosters the repression of genes encoding iron using proteins. In contrast, under iron-replete conditions, Php4 is inactivated at both transcriptional and post-transcriptional levels. Our group has already described that Php4 is a nucleo-cytoplasmic shuttling protein, which accumulates into the nucleus during iron deficiency. On the contrary, Php4 is exported from the nucleus to the cytoplasm in res

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Goddard, Philip M. "A microscopic study of nuclear fission using the time-dependent Hartree-Fock method." Thesis, University of Surrey, 2014. http://epubs.surrey.ac.uk/806610/.

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This thesis is concerned with the application of the time-dependent Hartree-Fock method, adopting the Skyrme effective nuclear interaction, to investigate induced nuclear fission processes. Three-dimensional, symmetry-unrestricted constrained Hartree-Fock calculations of ²⁴⁰Pu are presented to obtain the static potential energy surface corresponding to an increasing quadrupole deformation. The time-dependent Hartree-Fock method is applied to evolve in time these deformed states. Different types of fission process are considered. Firstly, the evolution of static configurations which are deforme

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Peck, Marius [Verfasser], Joachim [Akademischer Betreuer] Enders, and Norbert [Akademischer Betreuer] Pietralla. "Correlation experiments in photon-induced nuclear fission / Marius Peck ; Joachim Enders, Norbert Pietralla." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1216997799/34.

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Calviani, Marco. "Measurement of fission cross-section of actinides at n_TOF for advanced nuclear reactors." Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3427217.

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The subject of this thesis is the determination of high accuracy neutron-induced fission cross-sections of various isotopes - all of which radioactive - of interest for emerging nuclear technologies. The measurements had been performed at the CERN neutron time-of-flight facility n_TOF. In particular, in this work, fission cross-sections on 233U, the main fissile isotope of the Th/U fuel cycle, and on the minor actinides 241Am, 243Am and 245Cm, have been analyzed. Data on these isotopes are requested for the feasibility study of innovative nuclear systems (ADS and Generation IV reactors) curren

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Régnier, David. "Contribution à l'étude des gammas prompts de fission." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI065.

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Cette thèse a essentiellement été motivée par la montée en puissance de la thématique des échauffements nucléaires en réacteurs. Elle avait pour objectif la mise en place de méthodes permettant la simulation de l'émission des gammas prompts de fission. Pour répondre à cette attente, différents algorithmes de désexcitation d'un noyau ont été implémentés. Ils ont été testés avec succès via plusieurs calculs d'application (rapport d'embranchement isomérique, largeur radiative totale, etc). Ces méthodes ont ensuite été mises en oeuvre dans le cadre du code de fission FIFRELIN. L'outil qui en résul

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Lee, Terry Tak-Keon. "Safety analysis report and technical specifications of the MITR fission converter facility for neutron capture therapy." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43345.

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