Exploració per tema "Nucleosíntesi"
Ara es mostren els items 1-20 de 25
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123-321 models of classical novae
(EDP Sciences, 2020-01-28)
Article
Accés obert
Realitzat a/amb: Università di PisaContext. High-resolution spectroscopy has revealed large concentrations of CNO and sometimes other intermediate-mass elements (e.g., Ne, Na, Mg, or Al, for ONe novae) in the shells ejected during nova outbursts, suggesting ... -
7Be(n , p)7Li reaction and the cosmological lithium problem: measurement of the cross section in a wide energy range at n_TOF at CERN
(American Institute of Physics (AIP), 2018-07-24)
Article
Accés obertWe report on the measurement of the 7Be(n,p)7Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction plays a ... -
7Be(n,alpha) and 7Be(n,p) cross-section measurement for the cosmological lithium problem at the n TOF facility at CERN
(EDP Sciences, 2016)
Comunicació de congrés
Accés obertThe Cosmological Lithium Problem refers to the large discrepancy between the abundance of primordial 7Li predicted by the standard theory of Big Bang Nucleosynthesis and the value inferred from the so-called “Spite plateau” ... -
Astrophysical Implications of the139La(n,gamma) and151Sm(n,gamma) Cross Section Measured at n_TOF
(2006)
Text en actes de congrés
Accés obertThe nuclear resonance parameters and the capture cross section of the neutron magic isotope 139La and of the radioactive isotope 151Sm have been measured relative to 197Au in the energy range of 0.6 eV-1 MeV at neutron ... -
Capture cross section measurements of 186,187,188-Os at n TOF: the resolved resonance region
(EDP Sciences, 2007)
Text en actes de congrés
Accés obertThe neutron capture cross sections of 186,187,188Os have been measured at the CERN neutron time-of-flight facility, n TOF, in the neutron energy range from 1 eV up to 1MeV. In this contribution, we report the results of ... -
First Measurement of 72Ge(n gamma) at n-TOF
(EDP Sciences, 2018)
Text en actes de congrés
Accés obertThe slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics ... -
Hydrogen burning of 29Si and its impact on presolar stardust grains from classical novae
(Institute of Physics (IOP), 2022-04-01)
Article
Accés obertPresolar stardust grains found in primitive meteorites are believed to retain the isotopic composition of stellar outflows at the time of grain condensation. Therefore, laboratory measurements of their isotopic ratios ... -
Level structure of the Tz=-1 nucleus Ar 34 and its relevance for nucleosynthesis in ONe novae
(American Physical Society, 2021-03-08)
Article
Accés obertThe 24Mg+12C fusion reaction was used to perform a detailed ¿-ray spectroscopy study of the astrophysically important nucleus 34Ar. In particular, an experimental setup, coupling the advanced ¿-ray tracking array GRETINA ... -
Measurement of 73Ge(n,gamma) cross sections and implications for stellar nucleosynthesis
(Elsevier, 2019-03-10)
Article
Accés obert73Ge(n,gamma) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar ... -
Measurement of the 24,25,26Mg(n, gamma) reaction cross-section at n-TOF
(PoS - Proceedings of Science, 2010)
Text en actes de congrés
Accés obertWe have measured the neutron-induced capture cross-section of the importants-process isotopesof magnesium. The measurement has been performed at the neutron time-of-flight facility n_TOFat CERN. From a preliminary analysis ... -
Measurement of the radiative capture cross section of the s-process branching points 204Tl and 171Tm at the n_TOF facility (CERN)
(EPJ Web of Conferences, 2018)
Text en actes de congrés
Accés obertThe neutron capture cross section of some unstable nuclei is especially relevant for s-process nucleosynthesis studies. This magnitude is crucial to determine the local abundance pattern, which can yield valuable information ... -
Measuring the ß-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region
(Institute of Physics (IOP), 2022-09-06)
Article
Accés obertThe ß-delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes of Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using the Advanced Implantation Detector Array (AIDA) and the ... -
Models for Type I X-Ray Bursts Nucleosynthesis with Parallelisation and Improved Nuclear Physics
(Universitat Politècnica de Catalunya, 2012-02-03)
Projecte Final de Màster Oficial
Accés obertType I XRBs are thermonuclear flashes on the surface of neutron stars (NS) associated with mass-accretion from a companion star. Models of type I XRBs and their associated nucleosynthesis are physically complicated and ... -
Models of classical novae with MESA
(Universitat Politècnica de Catalunya, 2017-06)
Treball Final de Grau
Accés obertClassical novae are thermonuclear runaways at the envelope of a WD due to the piling up of H-rich accreted material. They have been observed to produce heavy elements during the explosion, and their role in galactical ... -
Monash Chemical Yields Project (Mon¿ey) - Element production in low- and intermediate-mass stars of metallicities Z = 0 to 0.04
(Cambridge University Press, 2016)
Comunicació de congrés
Accés obertThe Mon¿ey project will provide a large and homogeneous set of stellar yields for the low- and intermediate- mass stars and has applications particularly to galactic chemical evolution modelling. We describe our detailed ... -
(n,cp) reactions study at the n_TOF facilitty at CERN: results for the cosmological lithium problem
(European Organization for Nuclear Research (CERN), 2019)
Comunicació de congrés
Accés obertThe Big Bang Nucleosynthesis describes the production of the lightest nuclides from deuterium to Li at the early stages of the Universe. While a general good agreement is found for most of the isotopes involved in the ... -
Neutron induced reactions for the s process, and the case of Fe and Ni isotopes
(PoS - Proceedings of Science, 2012)
Text en actes de congrés
Accés obertNeutron capture cross sections are the key nuclear physics input to understand nucleosynthesis of the slow neutron capture process (s process). At the neutron time of flight facility n_TOF at CERN neutron capture cross ... -
Neutron research at the N_TOF facility (CERN): Results and perspectives
(American Institute of Physics (AIP), 2013)
Text en actes de congrés
Accés restringit per política de l'editorialn the first ten years of operation, the neutron time-of-flight facility n_TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and ... -
New constraints on the Al 25 (p,¿) reaction and its influence on the flux of cosmic ¿ rays from classical nova explosions
(American Physical Society, 2021-08-16)
Carta nàutica
Accés obertThe astrophysical 25Al(p,¿)26Si reaction represents one of the key remaining uncertainties in accurately modeling the abundance of radiogenic 26Al ejected from classical novae. Specifically, the strengths of key proton-unbound ... -
On the parallelization of stellar evolution codes
(Springer (Biomed Central Ltd.), 2018-11-01)
Article
Accés obertMultidimensional nucleosynthesis studies with hundreds of nuclei linked through thousands of nuclear processes are still computationally prohibitive. To date, most nucleosynthesis studies rely either on hydrostatic/hydrodynamic ...
