We calculate the evolution of the progenitor star, hydrodynamics and
nucleosynthesis of the SN explosion, and the SN bolometric light curve (LC).
Aug. 7, 2017 - Most of the nuclear reactions that drive
the nucleosynthesis of the elements in our universe occur in very extreme stellar plasma conditions.
Not exact matches
All her arguments have already been made on the basis
of Big Bang evidence (relation between the distance and speed
of galaxies,
nucleosynthesis, etc.).
Hoyle was a different bird, but he was the key contributor to the
nucleosynthesis theory, that secures him as one
of the big scientists
of the 20th century.
Without this brief period
of nucleosynthesis, the early universe would have consisted entirely
of hydrogen.
Spectroscopic identification
of r - process
nucleosynthesis in a double neutron - star merger.
If these efforts succeed, we can measure the properties
of wimps and then play the Big Bang
Nucleosynthesis game all over again, this time with dark matter.
Their theory, known as Big Bang
Nucleosynthesis, included detailed predictions
of how much
of each element would have been produced in the roughly three minutes
of nuclear reactions.
Detection
of near - infrared signatures
of r - process
nucleosynthesis with Gemini - South.
In physical cosmology, Big Bang
nucleosynthesis (or primordial
nucleosynthesis) refers to the production
of nuclei other than H - 1, the normal, light hydrogen, during the early phases
of the universe, shortly after the Big Bang.
The first nuclei, including most
of the helium and all
of the deuterium in the universe, were theoretically created during big bang
nucleosynthesis, about 3 minutes after the big bang.
M. R. Drout et al., «Light curves
of the neutron star merger GW170817 / SSS17a: Implications for r - process
nucleosynthesis,» Science (16 October 2017)
A third important line
of evidence is the relative proportion
of light elements in the universe, which is a close match to predictions for the formation
of light elements in the first minutes
of the universe, according to Big Bang
nucleosynthesis.
«The origin
of heavy elements produced in nature through rapid neutron capture («r - process») by seed nuclei is one
of the current
nucleosynthesis mysteries,» Dr. Kenta Hotokezaka, Prof. Tsvi Piran and Prof. Michael Paul from the Racah Institute
of Physics at the Hebrew University
of Jerusalem said in their letter.
«Enriching our knowledge
of the structures
of highly unstable nuclei and the nucleon - nucleon forces that drive nuclear shell evolution and the appearance or disappearance
of the nuclear magic numbers in radioactive nuclei plays an important role in understanding astrophysical processes such as
nucleosynthesis in stars,» he adds.
Photometric observations
of a neutron star merger show that it produced heavy elements through r - process
nucleosynthesis.
At a recent conference commemorating the 50th anniversary
of that paper, known as B2FH for the initials
of its authors (Geoffrey and Margaret Burbidge, now at the University
of California, San Diego, along with the late Willy Fowler
of the California Institute
of Technology and Hoyle), Clayton said that
of 30 major
nucleosynthesis papers published between 1960 and 1973, 18 cited B2FH and only one gave the nod to Hoyle's 1954 paper.
The
nucleosynthesis calculations are still affected by the memory
of the presence
of the 17 keV neutrino.
But instead
of citing the 1954 study, Clayton says, researchers discussing fusional element formation, or
nucleosynthesis, typically reference a 1957 paper co-authored by Hoyle and three colleagues, which went into greater detail but on other facets
of the problem, says Donald Clayton, professor emeritus
of physics and astronomy at Clemson University in South Carolina.
Then a series
of lectures follow on their contributions to the
nucleosynthesis and chemical evolution
of the Milky Way and dwarf galaxies in the local group and to the evolutionary characteristics
of planet - hosting stars from theoretical and observational viewpoints.
How do the products
of nucleosynthesis mix inside stars?
It is thought to have been produced in supernova
nucleosynthesis from the collision
of two neutron stars and to have been present in the dust from which the Solar System formed.
The fundamental observations that corroborate the Big Bang are the cosmic microwave radiation and the chemical abundances
of the light elements described in the Big Bang
nucleosynthesis theory.
«The predictions
of Big Bang
nucleosynthesis have been one
of the main successes
of the standard Big Bang model,» said lead author Lind.
HEFT will map the hard X-ray emission from supernova remnants to investigate issues
of stellar
nucleosynthesis (through the mapping
of radioactive Titanium) and study the origin and acceleration
of cosmic - rays (through mapping the continuum hard X-rays produced in the same shocks that produce the cosmic - rays).
Astronomers have long suspected that they are synthesized in neutron star collisions through rapid capture
of neutrons — what is known as r - process
nucleosynthesis — but had no proof.
As an analog to your question, one could ask what tests might cause us to radically reassess the atomic theory
of matter or
nucleosynthesis as the model for energy generation in stars?
Do you know the story about Hans Bethe's discovery
of stellar
nucleosynthesis as their power source?