Results 51 to 60 of about 21,814 (256)
Primordial nucleosynthesis with varying fundamental constants [PDF]
Astronomy & Astrophysics, 2020 The success of primordial nucleosynthesis as a cornerstone of the hot Big Bang model has been limited by the long-standing lithium problem. Recent work presented a self-consistent perturbative analysis of the effects of variations in nature’s fundamental
M. T. Clara, C. J. A. P. Martins
semanticscholar +1 more source
Positron Transport and Annihilation in the Galactic Bulge
Galaxies, 2018 The annihilation of positrons in the Milky Way Galaxy has been observed for ∼50 years; however, the production sites of these positrons remains hard to identify.
Fiona Helen Panther
doaj +1 more source
Massive Star Modeling and Nucleosynthesis
Frontiers in Astronomy and Space Sciences, 2021 After a brief introduction to stellar modeling, the main lines of massive star evolution are reviewed, with a focus on the nuclear reactions from which the star gets the needed energy to counterbalance its gravity.
Sylvia Ekström
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QUÍMICA ESTELAR E ESTRELAS APOCALÍPTICAS: ESTUDO COMPARATIVO
Colloquium Exactarum, 2012 All atoms existing in the Universe, except Hydrogen (H) and helium (He), arise from processes occurring in stars and their evolution. The stars transmute the H and He in other heavier elements through nuclear fusion and its process rolling, filling and ...
Nikele Milani +3 more
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Revisiting big-bang nucleosynthesis constraints on long-lived decaying particles [PDF]
, 2017 The authors provide a state of the art analysis of the effects of long-lived non-Standard Model massive particles, decaying during big-bang nucleosynthesis (BBN), on the primordial abundances of light elements. Besides updated standard BBN reaction rates,
M. Kawasaki +3 more
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Neutron-Driven Nucleosynthesis in Stellar Plasma
Frontiers in Physics, 2022 A large uncertainty for the slow neutron capture nucleosynthesis (s-process) models is caused by the amount of neutrons available to the process itself.
R. Spartà +24 more
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Design study of a HPGe detector array for β-decay investigation in laboratory ECR plasmas
Frontiers in Physics, 2022 In the frame of the PANDORA project, a new experimental approach aims at measuring in-plasma β-decay rate as a function of thermodynamical conditions of the environment, namely a laboratory magnetized plasma able to mimic some stellar-like conditions ...
Eugenia Naselli +12 more
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The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South [PDF]
, 2017 We present a near-infrared spectral sequence of the electromagnetic counterpart to the binary neutron star merger GW170817 detected by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo.
R. Chornock +37 more
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Atoms, 2023 The nucleosynthesis of chemical elements has been established to be the result of a variety of different types of nuclear reactions in stars. Under the extreme temperatures and densities encountered in such environments, nuclear isomers can be populated ...
Eric B. Norman
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Universe, 2021 The slow neutron-capture process (s-process) efficiency in low-mass AGB stars (1.5 < M/M⊙ < 3) critically depends on how mixing processes in stellar interiors are handled, which is still affected by considerable uncertainties.
Umberto Battino +4 more
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