Results 11 to 20 of about 1,537 (185)

Neutrino nucleosynthesis [PDF]

Physics Letters B, 2005
We study neutrino process nucleosynthesis in massive stars using newly calculated cross sections, an expanded reaction network, and complete and self-consistent models of the progenitor star. We reevaluate the production of light isotopes from abundant progenitors as well as that of rare, heavy, proton-rich isotopes.
Heger, A., Kolbe, E., Haxton, W.C., Langanke, Karlheinz, Martinez-Pinedo, G., Woosley, S.E.   +5 more
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Hypernovae and their nucleosynthesis [PDF]

Symposium - International Astronomical Union, 2003
We review the characteristics of nucleosynthesis in ‘hypernovae’, i.e., core-collapse supernovae with very large explosion energies (≳ 1052 ergs). The hypernova yields show the following characteristics: (i) the mass ratio between the complete and incomplete Si burning regions is larger in hypernovae than normal supernovae.
Nomoto, Ken'ichi, Maeda, Keiichi, Umeda, Hideyuki, Ohkubo, Takuya, Deng, Jingsong, Mazzali, Paolo   +5 more
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Structure formation cosmic rays: Identifying observational constraints [PDF]

Serbian Astronomical Journal, 2005
Shocks that arise from baryonic in-fall and merger events during the structure formation are believed to be a source of cosmic rays. These "structure formation cosmic rays" (SFCRs) would essentially be primordial in composition, namely, mostly made of ...
Prodanović T., Fields B.D.
doaj   +1 more source

Magellanic Clouds Cepheids: Thorium Abundances [PDF]

Journal of Astronomy and Space Sciences, 2018
The analysis of the high-resolution spectra of 31 Magellanic Clouds Cepheid variables enabled the identification of thorium lines. The abundances of thorium were found with spectrum synthesis method. The calculated thorium abundances exhibit correlations
Yeuncheol Jeong, Alexander V. Yushchenko, Vira F. Gopka, Volodymyr O. Yushchenko, Valery V. Kovtyukh, Svetlana V. Vasil’eva   +5 more
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Primordial Nucleosynthesis [PDF]

Journal of Physics: Conference Series, 2013
Invited Plenary Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)
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Screening Effects in Stars and in the Laboratory

Frontiers in Physics, 2022
Nuclear reactions are the driver of the evolution of many astrophysical objects. In the astrophysical environment their respective reaction rates are, however, modified due to the presence of other charges.
Marialuisa Aliotta, Karlheinz Langanke, Karlheinz Langanke   +2 more
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R-Process with Magnetized Nuclei at Dynamo-Explosive Supernovae and Neutron Star Mergers

Universe, 2021
Nucleosynthesis at latge magnetic induction levels relevant to core-collapse supernovae and neutron star mergers is considered. For respective magnetic fields of a strength up to ten teratesla, atomic nuclei exhibit a linear magnetic response due to the ...
Vladimir N. Kondratyev
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Indirect Measurements of n- and p-Induced Reactions of Astrophysical Interest on Oxygen Isotopes

Frontiers in Astronomy and Space Sciences, 2020
Observations of abundances and isotopic ratio determinations in stars yield powerful constraints on stellar models. In particular, the oxygen isotopic ratios are of particular interest because they are affected not only by nucleosynthesis but also by ...
M. L. Sergi, M. L. Sergi, G. L. Guardo, G. L. Guardo, M. La Cognata, M. Gulino, M. Gulino, J. Mrazek, S. Palmerini, S. Palmerini, C. Spitaleri, C. Spitaleri, M. Wiescher   +12 more
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s-Processing in Asymptotic Giant Branch Stars in the Light of Revised Neutron-Capture Cross Sections

Universe, 2021
Current AGB stellar models provide an adequate description of the s-process nucleosynthesis that occurs. Nonetheless, they still suffer from many uncertainties related to the modeling of the 13C pocket formation and the adopted nuclear reaction rates ...
Diego Vescovi, René Reifarth
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Primordial nucleosynthesis [PDF]

Proceedings of the National Academy of Sciences, 1998
With the advent of the new extragalactic deuterium observations, Big Bang nucleosynthesis (BBN) is on the verge of undergoing a transformation. In the past, the emphasis has been on demonstrating the concordance of the BBN model with the abundances of the light isotopes extrapolated back to their primordial values by using ...
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