Results 81 to 90 of about 13,537 (199)

Neutrinos and Big Bang Nucleosynthesis [PDF]

Physica Scripta, 2005
According to the standard models of particle physics and cosmology, there should be a background of cosmic neutrinos in the present Universe, similar to the cosmic microwave photon background. The weakness of the weak interactions renders this neutrino background undetectable with current technology.
openaire   +4 more sources

New Results on Nucleosynthesis in Massive Stars; Nuclear Data Needs for

, 2001
Introduction Second only in scientific interest to the origin of the universe itself is the origin of the chemical elements therein. The near term goal of nuclear origins, or nucleosynthesis, seeks to develop a complete understanding of the origin of ...
Stan Woosley, Nucleosynthesis Robert Hoffman, Thomas Rauscher, Alex Heger, Robert Hoffman   +4 more
core  

An Introduction to Primordial Nucleosynthesis

, 2006
International audiencePrimordial nucleosynthesis is one of the three observational evidences for the Big Bang model. Even though they span a range of nine orders of magnitude, there is indeed a good overall agreement between primordial abundances of ^4He,
A. Coc, Coc, A.
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The Ba Isotopic Ratio as a Way of Distinguishing the R- and S-Process in Chemical Evolution Models

Galaxies
Only recently, observational studies have started providing measurements for the barium isotopic ratio in metal-poor stars with unprecedented detail. This new approach can be extremely useful in tracing back the origin of neutron-capture elements, since ...
Federico Rizzuti, Gabriele Cescutti, Linda Lombardo, Lorenzo Roberti, Tatyana Sitnova   +4 more
doaj   +1 more source

Nucleosynthesis Predictions and High-Precision Deuterium Measurements

Universe, 2017
Two new high-precision measurements of the deuterium abundance from absorbers along the line of sight to the quasar PKS1937–1009 were presented. The absorbers have lower neutral hydrogen column densities (N(HI) ≈ 18 cm − 2 ) than for previous ...
Signe Riemer-Sørensen, Espen Sem Jenssen   +1 more
doaj   +1 more source

Explosive processes in nucleosynthesis

, 2002
There are many explosive processes in nucleosynthesis: big bang nucleosynthesis, the rp-process, the $\gamma$-process, the $\nu$-process, and the r-process.
R.N. Boyd
core   +1 more source

Positron accumulations from stellar nucleosynthesis

Frontiers in Astronomy and Space Sciences
The predominant fusion chain in stellar nucleosynthesis produces positron and neutrino byproducts in equal amounts. An extremely high neutrino flux can be directly measured, but the unobservable, yet equally high flux of positrons is traditionally ...
Joseph Caleb Philipps, John Gahl, John Gahl, Lisa Shepard, Andrew Gillespie   +4 more
doaj   +1 more source

Essentials of Nucleosynthesis and Theoretical Nuclear Astrophysics

, 2020
Studies in nucleosynthesis and nuclear astrophysics are highly interdisciplinary, encompassing such fields as nuclear physics, stellar structure and evolution, hydrostatics and hydrodynamics, differential equations for following isotopic abundance ...
Rauscher, Thomas
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Exploring Nucleosynthesis Models through Inertial Confinement Fusion

openUnderstanding the origin and evolution of the elements remains one of the key challenges in astro- physics. While traditional nucleosynthesis studies rely on accelerator-based experiments conducted in underground laboratories, these setups are ...
PAVAN, LIDIA GIUDITTA
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Galactic cosmic rays and nucleosynthesis

, 2009
International audienceThe nucleosynthesis of the light elements Li, Be and B by galactic cosmic rays is presented. Observations of cosmic rays and the nuclear reactions responsible for Li, Be and B nucleosynthesis are described, followed by some words on
Kiener, J.
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