Results 81 to 90 of about 12,181 (205)
Chemical Tracing and the Origin of Carbon in the Galactic Disk
Universe, 2022 A basic problem in studies of the evolution of chemical elements in galaxies is the uncertainties in the yields of elements produced by different types of stars.
Bengt Gustafsson
doaj +1 more source
The bulk mineralogy, elemental composition, and water content of the Winchcombe CM chondrite fall
Meteoritics &Planetary Science, Volume 59, Issue 5, Page 1006-1028, May 2024.Abstract On the microscale, the Winchcombe CM carbonaceous chondrite contains a number of lithological units with a variety of degrees of aqueous alteration. However, an understanding of the average hydration state is useful when comparing to other meteorites and remote observations of airless bodies.
H. C. Bates +8 more
wiley +1 more source
, 2022 As the early universe expands and cools the rates of the weak interactions that keep neutrinos in thermal equilibrium with the matter and the related rates of the reactions that inter-convert neutrons and protons decrease. Eventually, these rates fall below the expansion rate -- they freeze out.
Grohs, Evan, Fuller, George M.
openaire +2 more sources
Heavy Elements and Electromagnetic Transients from Neutron Star Mergers
Annalen der Physik, Volume 536, Issue 2, February 2024.Astro‐(physics) has made major leaps forward through the combined information provided by both gravitational waves and electromagnetic emission from the first detected neutron star merger event. This review provides an up‐to‐date overview of today's understanding of neutron star mergers and their electromagnetic emission and it discusses possible ...
Stephan Rosswog, Oleg Korobkin
wiley +1 more source
Production of Li, Be \& B from Baryon Inhomogeneous Primordial Nucleosynthesis [PDF]
Astrophys.J.430:291-299,1994, 1993 We investigate the possibility that inhomogeneous nucleosynthesis may eventually be used to explain the abundances of \li6, \be9 and B in population II stars. The present work differs from previous studies in that we have used a more extensive reaction network.
arxiv +1 more source
Extremely Metal-Poor Asymptotic Giant Branch Stars
Universe, 2022 Little is known about the first stars, but hints on this stellar population can be derived from the peculiar chemical composition of the most metal-poor objects in the Milky Way and in resolved stellar populations of nearby galaxies.
Mario Cirillo +2 more
doaj +1 more source
Journal of Geophysical Research: Planets, Volume 129, Issue 2, February 2024.Abstract The nucleosynthetic Cr isotope anomalies provides useful information to trace the source and origin of extraterrestrial samples, but it is usually influenced by high‐energy cosmic rays, and evaluating such effect of cosmic rays in lunar samples is especially important.
Bailiang Liu +5 more
wiley +1 more source
Baryon/anti-baryon inhomogeneity and big bang nucleosynthesis [PDF]
arXiv, 1998 We investigate the effects of baryon/anti-baryon inhomogeneity on primordial nucleosynthesis. Recent work claims that electroweak baryogenesis could give rise to distinct regions of net baryon and anti-baryon number, which could survive until the nucleosynthesis epoch.
arxiv
Supernova neutrinos and nucleosynthesis [PDF]
Journal of Physics G: Nuclear and Particle Physics, 2014 Observations of metal-poor stars indicate that at least two different nucleosynthesis sites contribute to the production of r-process elements.
Gabriel Martínez-Pinedo +2 more
openaire +3 more sources
Nuclear astrophysicists at war
Natural Sciences, Volume 4, Issue 1, January 2024.The Manhattan program not only opened the path to the nuclear age for humans, but also triggered a lot of new questions and research directions in nuclear physics and astrophysics that still inform the ideas in these fields today. Abstract The question of energy production in stars stimulated an entire generation of young physicists in the 1930s who ...
Michael Wiescher, Karlheinz Langanke
wiley +1 more source