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Relevant bibliographies by topics / Experimental nuclear astrophysic / Dissertations / Theses

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Dissertations / Theses on the topic 'Experimental nuclear astrophysic'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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Consult the top 21 dissertations / theses for your research on the topic 'Experimental nuclear astrophysic.'

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1

MASHA, ELIANA. "ASTROPHYSICAL NUCLEAR REACTIONS ON NEON ISOTOPES AT LUNA." Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/899089.

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This thesis reports the direct measurements of the 22Ne(α,γ)26Mg and 20Ne(p,γ)21Na reactions at astrophysical energies of interest. The 22Ne(α,γ)26Mg reaction competes with the 22Ne(α,n)25Mg reaction which is the main source of neutrons for the s-process in low-mass Asymptotic Giant Branch and massive stars. At temperatures T < 300 MK where the (α,γ) channel becomes dominant, the rate of the 22Ne(α,γ)26Mg reaction is influenced by several resonances studied only indirectly. The first part of this thesis concerns the direct measurement of one of these resonances, Er = 334 keV, which so f

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2

Doherty, Daniel Thomas. "Experimental studies for explosive nuclear astrophysics." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/18022.

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In the ejecta from ONe novae outbursts nuclei up to A~40 are observed. The 30P(p,γ)31S reaction is thought to be the bottleneck for the production of all elements heavier than sulphur. However, due to uncertainties in the properties of key proton-unbound resonances the reaction rate is not well determined. In this thesis work, excited states in 31S were populated via the 28Si(4He,n) light-ion fusion-evaporation reaction and the prompt electromagnetic radiation was then detected with the GAMMASPHERE detector array. This γ-ray spectroscopy study, and comparisons with the stable mirror nucleus 31

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3

Álvarez, Pastor José Manuel. "Focal plane detectors of a Laue lens telescope for Nuclear Astrophysics." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/83940.

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centenares de keV hasta unos pocos MeV), presenta un extraordinario potencial para comprender los procesos más extremos que tienen lugar en el Universo, como las explosiones estelares o los aceleradores de partículas. No obstante, a pesar de los enormes esfuerzos realizados por los observatorios de rayos gamma (en el pasado y en la actualidad), se requiere una mejora en la sensibilidad instrumental para aprovechar el enorme potencial científico contenido en este rango energético. Durante las dos últimas décadas se han buscado formas de mejorar la sensibilidad de los instrumentos, increm

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4

Depalo, Rosanna. "The neon-sodium cycle: Study of the 22Ne(p,gamma)23Na reaction at astrophysical energies." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424304.

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The 22Ne(p,gamma)23Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle plays a crucial role for the synthesis of the elements with mass A = 20-25 in asymptotic giant branch stars, classical novae explosions and type Ia supernovae, where hydrogen burning occurs at high temperatures. The 22Ne(p,gamma)23Na thermonuclear reaction rate is highly uncertain because of a large number of poorly known resonances lying at astrophysical energies. This thesis reports on a new experimental study of the 22Ne(p,gamma)23Na reaction. In particular, two experiments have been perfo

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5

Kamil, Mohamed. "Spectroscopy of proton unbound states in 32Cl." University of the Western Cape, 2019. http://hdl.handle.net/11394/6615.

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>Magister Scientiae - MSc<br>This project aimed to investigate proton unbound states in 32Cl using the 32S(3He; t) charge-exchange reaction. This research is relevant both in the context of nuclear structure and astrophysics. Excited states in 32Cl up to Ex 6 MeV were produced using a 50 MeV 3He++ beam from the K200 separated sector cyclotron at iThemba LABS. The triton ejectiles were mass analysed and detected at the focal plane of the K600 magnetic spectrometer. An additional segmented silicon detector array called CAKE was used to detect the unbound protons from states in 32Cl in

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6

Singh, Bhivek. "The design and simulation of a new experimental set up to measure nuclear level lifetimes." University of the Western Cape, 2016. http://hdl.handle.net/11394/5659.

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>Magister Scientiae - MSc<br>Measurements of nuclear level lifetimes are an important aspect of experimental nuclear physics. Such measurements determine transition matrix elements for nuclear structure research and also provide the widths of relevant excited states in nuclei that are of astrophysical interest. In the latter, the measured widths are used to obtain reaction rates in main sequence stars such as the Sun and in binary-star systems where the accretion of material from one star to another provides an opportunity to study extreme stellar environments such as novae and x-ray bursts. T

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7

Schmidt, Konrad. "Experimente zur Entstehung von Titan-44 in Supernovae." Forschungszentrum Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-93636.

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In dieser Diplomarbeit wurde das astrophysikalisch interessante Resonanztriplett der Reaktion 40Ca(α,γ)44Ti bei 4,5MeV untersucht. Am 3-MV-Tandetron des Helmholtz-Zentrums Dresden-Rossendorf wurden dafür die Energien von Protonen- und -Strahlen kalibriert, Anregungsfunktionen im Energiebereich der drei Resonanzen aufgenommen, vier CaOTargets aktiviert und deren Struktur mittels der Reaktion 40Ca(p,γ)41Sc überprüft. Im Felsenkeller-Niederniveaumesslabor wurde anschließend die Aktivität der Proben gemessen. Schließlich konnte die Summe der Resonanzstärken bei 4497 und 4510 keV -Energie im Labors

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8

Howard, Meredith E. "The Joy of CEX: Sharpening the (t,³He) probe at 345 MeV for the charge-exchange knife drawer." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1222168015.

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9

Chabert, Laurent. "Etude du bruit de fond neutron induit par les muons dans l'expérience EDELWEISS-II." Phd thesis, Université Claude Bernard - Lyon I, 2004. http://tel.archives-ouvertes.fr/tel-00007093.

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Plusieurs observations astronomiques indiquent que la densité de matière dans notre Univers est dominée par sa composante invisible. Parmi les particules pouvant constituer cette matière, le neutralino est un candidat supersymétrique favorisé. Cette thèse s'est faite dans le cadre de la collaboration EDELWEISS. Cette expérience tente de mettre en évidence l'interaction d'un neutralino avec un noyau cible. Les bolomètres utilisés par EDELWEISS associent à la détection des phonons celle des charges créées par le dépôt d'énergie. Cette double détection permet de rejeter une partie importante du b

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10

Anders, Michael. "S-factor measurement of the 2H(α,γ)6Li reaction at energies relevant for Big-Bang nucleosynthesis". Forschungszentrum Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-141091.

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For about 20 years now, observations of 6Li in several old metal-poor stars inside the halo of our galaxy have been reported, which are largely independent of the stars’ metallicity, and which point to a possible primordial origin. The observations exceed the predictions of the Standard Big-Bang Nucleosynthesis model by a factor of 500. In the relevant energy range, no directly measured S-factors were available yet for the main production reaction 2H(α,γ)6Li, while different theoretical estimations have an uncertainty of up to two orders of magnitude. The very small cross section in the picoba

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11

Machado, Laura Paulucci. "Matéria de quarks (strangelets) de origem astrofísica e sua detecção por experimentos terrestres." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26112008-100951/.

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A hipótese de que a matéria estranha de quarks (um plasma composto por quarks up, down e strange em quantidades aproximadamente iguais) é estável `a pressão nula vem sendo considerada há mais de vinte anos, tanto teoricamente quanto em experimentos específicos para sua eventual detecção. Se a matéria estranha é de fato estável, então poderia haver importantes implicações para a Astrofísica. Entre as mais estimulantes destas implicações está a possibilidade de conversão da matéria nuclear ordinária em matéria estranha no interior das estrelas de nêutrons devido ás altíssimas densidades ali enco

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12

Paneru, Som N. "Elastic Scattering of ³He+⁴He with SONIK." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1595631779431617.

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13

Ujić, Predrag. "La réaction 78Kr ($/alpha$ , $/gamma$) d'intérêt astrophysique en cinématique inverse et l'effet d'écrantage électronique dans la décroissance bêta." Phd thesis, Université de Caen, 2011. http://tel.archives-ouvertes.fr/tel-00648878.

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Cette thèse se compose de deux parties différentes qui s'inscrivent dans une thématique générale astrophysique. Les titres de ces parties sont : "La capture alpha en cinématique inverse liée au processus p ; mesure de la réaction 78Kr( $/alpha$ , $/gamma$ )82Sr "et "Mesures de la décroissance de 19O et 19Ne implantés dans le niobium ". L'objet de la première partie est directement liée à l'astrophysique nucléaire. Il s'agit d'établir une technique expérimentale pour la mesure directe à basse énergie de sections efficaces de réactions de capture radiative alpha en cinématique inverse. Ces réact

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14

Anders, Michael. "S-factor measurement of the 2H(α,γ)6Li reaction at energies relevant for Big-Bang nucleosynthesis". Helmholtz-Zentrum Dresden-Rossendorf, 2013. https://hzdr.qucosa.de/id/qucosa%3A22184.

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For about 20 years now, observations of 6Li in several old metal-poor stars inside the halo of our galaxy have been reported, which are largely independent of the stars’ metallicity, and which point to a possible primordial origin. The observations exceed the predictions of the Standard Big-Bang Nucleosynthesis model by a factor of 500. In the relevant energy range, no directly measured S-factors were available yet for the main production reaction 2H(α,γ)6Li, while different theoretical estimations have an uncertainty of up to two orders of magnitude. The very small cross section in the picoba

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15

González, Boquera Claudia. "Neutron-rich matter in atomic nuclei and neutron stars." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/668774.

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The proper understanding of the equation of state (EoS) of highly asymmetric nuclear matter is essential when studying systems such as neutron stars (NSs). Using zero-range Skyrme interactions and finite-range interactions such as Gogny forces, momentum-dependent interactions (MDI) and simple effective interactions (SEI), we analyze the properties of the EoS and the influence they may have on the calculations for NSs. We start by studying the convergence properties of the Taylor series expansion of EoS in powers of the isospin asymmetry. Next, we analyze the accuracy of the results for β-stab

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16

de, Séréville Nicolas. "Etude de la réaction 18F(p,alpha)15O par réction de transfert pour application à l'émission gamma des novae." Phd thesis, Université Paris-Diderot - Paris VII, 2003. http://tel.archives-ouvertes.fr/tel-00007988.

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L'émission gamma des novae à, et en dessous, de 511 keV provient essentiellement de l'annihilation des positrons venant de la décroissance beta+ du 18F. L'interprétation de cette émission, à l'aide d'observations par le satellite INTEGRAL par exemple, nécessite une bonne connaissance de la nucléosynthèse du 18F. Dans ce contexte, le taux de la réaction 18F(p,alpha)15O est le moins bien connu à cause de deux résonances correspondant aux niveaux excités Ex = 6.419 et 6.449 MeV dans le 19Ne dont les largeurs protons sont totalement inconnues. Nous avons déterminé ces largeurs protons par le biais

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17

Arrieta, Lobo Maialen. "A study of the emission processes of two different types of gamma-emitting Active Galactic Nuclei." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLE0010/document.

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Ce manuscrit de thèse présente l’étude des processus d’émission de deux types de noyaux actifs de galaxie détectés aux rayons gamma : des blazars vues au TeV et des Narrow Line Seyfert 1s (NLS1s) détectés au GeV. La distribution spectrale d’énergie des blazars peut être décrite en général par des modèles 'one-zone synchrotron self-Compton'. Ce modèle a été appliqué au blazar 1ES2322-409 qui fut premièrement détecté au TeV par l’expérience HESS. Des composantes externes comme le tore, le disque d’accrétion, la couronne X ou la 'Broad Line Region' sont nécessaires pour expliquer la radiation obs

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18

Qu, Hai. "A J/[psi] polarization measurement with the PHENIX Muon Arms in proton+proton collisions at center of mass energy of 200 GeV at RHIC." unrestricted, 2008. http://etd.gsu.edu/theses/available/etd-11202008-163855/.

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Thesis (Ph. D.)--Georgia State University, 2008.<br>Title from file title page. Xiaochun He, committee chair; William Nelson, Steven Manson, Brian Thoms, Douglas Gies, committee members. Description based on contents viewed Aug. 21, 2009. Includes bibliographical references (p. 104-108).

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19

Thuillier, Thomas. "Un imageur d'anneaux Tcherenkov pour l'expérience AMS : simulation, prototypie et perspectives physiques." Phd thesis, Université Joseph Fourier (Grenoble), 2000. http://tel.archives-ouvertes.fr/tel-00001106.

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Le spectromètre magnétique AMS sera installé sur la station spatiale internationale ISS en 2003. Il sera en particulier équipé d'un imageur d'anneaux Tcherenkov à focalisation de proximité (RICH). Après une présentation des objectifs de recherche de la collaboration internationale AMS et de son détecteur, une étude détaillée du fonctionnement et des performances des RICH à focalisation de proximité est proposée. Le travail se poursuit par une étude par simulation du rayonnement cosmique nucléaire attendu dans AMS grâce au RICH. La thèse rapporte ensuite le travail mené sur le prototype d'image

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20

de, Oliveira Santos F. "Détermination par réaction de transfert de largeurs alpha dans le fluor 19. Applications à l'astrophysique." Phd thesis, Université Paris Sud - Paris XI, 1995. http://tel.archives-ouvertes.fr/tel-01009384.

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La nucléosynthèse du fluor n'est pas encore clairement expliquée. Plusieurs scénarios prédisent que la réaction de capture alpha radiative sur l'azote 15 est la principale réaction de production de fluor. Dans l'expression du taux de cette réaction un paramètre essentiel est manquant, la largeur partielle alpha de la résonance sur le niveau d'énergie E = 4,377 MeV du fluor 19. Une mesure directe est exclue du fait de la très faible valeur attendue de la section efficace. Nous avons déterminé cette largeur alpha par le biais d'une réaction de transfert et une analyse en FR-DWBA (Finite Range Di

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21

Ornelas, André José Neves Marques de. "Experimental advances on alpha nuclear potentials for the astrophysical p-process." Master's thesis, 2012. http://hdl.handle.net/10451/9046.

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Tese de mestrado em Engenharia Física, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2012<br>A dissertação ”Experimental advances on alpha nuclear potentials for the astrophysical pprocess” reflecte a actividade experimental realizada durante o período de estágio no ATOMKI, em Debrecen na Hungria, realizado sobre alçada do programa ERASMUS. Nesta dissertação será descrito o processo de preparação para a experiência de dispersão de partículas α em alvos de 64Zn, 113In e 115In. As ligações eléctricas, detectores e respectiva calibração, pré-amplificadores, amplificadore

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