Results 61 to 70 of about 12,181 (205)
Shell Model Applications in Nuclear Astrophysics
Physics, 2022 In recent years, shell model studies have significantly contributed in improving the nuclear input, required in simulations of the dynamics of astrophysical objects and their associated nucleosynthesis.
Gabriel Martínez-Pinedo +1 more
doaj +1 more source
Mass‐Loss, Composition and Observational Signatures of Stellar Winds From X‐Ray Bursts
Astronomische Nachrichten, Volume 346, Issue 1, January 2025.ABSTRACT X‐Ray bursts (XRBs) are powerful thermonuclear events on the surface of accreting neutron stars (NSs), which can synthesize intermediate‐mass elements. Although the high surface gravity prevents an explosive ejection, a small fraction of the envelope may be ejected by radiation‐driven winds.
Yago Herrera +4 more
wiley +1 more source
Light Elements in the Universe
Frontiers in Astronomy and Space Sciences, 2021 Due to their production sites, as well as to how they are processed and destroyed in stars, the light elements are excellent tools to investigate a number of crucial issues in modern astrophysics: from stellar structure and non-standard processes at work
Sofia Randich, Laura Magrini
doaj +1 more source
The s-process Nucleosynthesis [PDF]
Proceedings of the International Astronomical Union, 2005 Theoretical as well as observational aspects of the s-process nucleosynthesis are reviewed. The classical site-independent s-process model as well as the s-process in massive stars are shortly described. A special attention is paid to the nucleosynthesis taking place in AGB stars and the extra-mixing invoked to explain the production of neutrons in the
Lionel Siess, Stéphane Goriely
openaire +2 more sources
Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 863-885, December 2024.Key Points A method is described to obtain high precision Sn isotope ratios using the double spike technique in geological reference materials containing 0.03 to 7 μg g−1 of Sn. δ122/118Sn values are reported for sixteen geological RMs. Improved precision was achieved compared with previous studies by using low concentration Sn analyte.
Dipankar Pathak, Klaus Mezger
wiley +1 more source
Inhomogeneous Primordial Nucleosynthesis: Coupled Nuclear Reactions and Hydrodynamic Dissipation Processes [PDF]
Astrophys.J. 423 (1994) 50-67, 1993 We present a detailed study of inhomogeneous Big Bang nucleosynthesis where, for the first time, nuclear reactions are coupled to all significant fluctuation dissipation processes. Theses processes include neutrino heat transport, baryon diffusion, photon diffusive heat transport, and hydrodynamic expansion with photon-electron Thomson drag.
arxiv +1 more source
Nuclear reactions involving light elements & BBN [PDF]
EPJ Web of ConferencesLight elements play a key role in different scenario in astrophysics, ranging from primordial nucleosynthesis up to stellar nucleosynthesis and cosmic ray nucleosynthesis.
Lamia L.
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Observing the signatures of AGB s-process nucleosynthesis in planetary nebulae: An origins story
Frontiers in Astronomy and Space Sciences, 2022 I relate an anecdotal history of the beginnings of a new initiative in studies of the chemical composition of planetary nebulae: namely, investigating abundances of elements beyond the iron-peak through infrared spectroscopy.
Harriet L. Dinerstein
doaj +1 more source
Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 795-805, December 2024.Key Points Isotopic reference materials are rarely cross‐examined. An optimised regression model and MC‐ICP‐MS offer a cost‐effective way to assess the reliability of values assigned to multi‐isotope reference materials. A significant lack of consistency has been observed in the long‐standing isotopic reference materials for nickel and zinc. Calibrated
Juris Meija +4 more
wiley +1 more source
Structure effects of 20N in elemental abundance estimations during explosive nucleosynthesis [PDF]
EPJ Web of ConferencesMost nuclei far from the valley of stability, and typically near the drip lines, exhibit exotic features that have challenged our current understanding of nuclear structure.
Barman Jinti, Chatterjee Rajdeep
doaj +1 more source