Results 21 to 30 of about 53,561 (244)

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
openaire   +2 more sources

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
openaire   +3 more sources

Post-AGB Stars as Tracers of AGB Nucleosynthesis: An Update

Universe, 2022
The chemical evolution of galaxies is governed by the chemical yields from stars, and here we focus on the important contributions from asymptotic giant branch (AGB) stars. AGB nucleosynthesis is, however, still riddled with complexities.
Devika Kamath, Hans Van Winckel
doaj   +1 more source

Experiments probing clustering effects in explosive nucleosynthesis

Frontiers in Physics, 2023
Nuclear clustering affects the nucleosynthesis occurring in a number of astrophysical environments. Highly-clusterized nuclear states typically occur near particle thresholds and therefore can produce dramatic impacts on the nuclear reaction rates.
D. W. Bardayan
doaj   +1 more source

Impact of AGB Stars on the Chemical Evolution of Neutron-Capture Elements

Universe, 2022
In this review, we discuss the impact of s-process nucleosynthesis in asymptotic giant branch stars on the enrichment of heavy elements. We review the main steps made on this subject in the last 40 years and discuss the importance of modelling the ...
Gabriele Cescutti, Francesca Matteucci
doaj   +1 more source

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 stellar and
openaire   +2 more sources

Hydrogen Tunneling in Stoichiometric and Catalytic Reactions involving Transition Metals

ChemCatChem, Volume 15, Issue 24, December 19, 2023., 2023
An overview on the importance of the participation of hydrogen tunneling in E−H bond activation reactions (E=C, O, Si…) mediated by transition metals is presented. Understanding when hydrogen tunneling occurs can be a powerful tool for designing new catalysts to perform challenging reactions.
Jon M. Matxain, Miguel A. Huertos
wiley   +1 more source

A Proposal for a Low‐Frequency Axion Search in the 1–2 μ$\umu$ eV Range and Below with the BabyIAXO Magnet

Annalen der Physik, Volume 535, Issue 12, December 2023., 2023
This article describes the implementation of low‐frequency axion haloscope setups inside the future BabyIAXO magnet. The RADES proposal has a potential sensitivity to the axion‐photon coupling down to values corresponding to the KSVZ model, in the mass range between 1 and 2 μ$\umu$eV.
Saiyd Ahyoune, Alejandro Álvarez Melcón, Sergio Arguedas Cuendis, Sergio Calatroni, Cristian Cogollos, Jack Devlin, Alejandro Díaz‐Morcillo, David Díez‐Ibáñez, Babette Döbrich, Javier Galindo, Juan Daniel Gallego, Jose María García‐Barceló, Benito Gimeno, Jessica Golm, Yikun Gu, Louis Herwig, Igor Garcia Irastorza, Antonio Jose Lozano‐Guerrero, Chloé Malbrunot, Jordi Miralda‐Escudé, Juan Monzó‐Cabrera, Pablo Navarro, Jose Ramón Navarro‐Madrid, Javier Redondo, José Reina‐Valero, Kristof Schmieden, Tim Schneemann, Marc Siodlaczek, Stefan Ulmer, Walter Wuensch   +29 more
wiley   +1 more source

Kinetics of the tautomerization of thioimidic acids R−C(SH)NH → R−C(S)NH2: For R = H, F, HO, CN, NC, H2N, HC(O), HC(S), HC≡ C, CH3, CF3, H2C=CH, HOCH2, H2NCH2,CH3C(O), C2H5, (CH3)2CH, C6H5

International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023
Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley   +1 more source

Prospect for measurements of (γ, n) reaction cross-sections of p-nuclei at ELI-NP

Frontiers in Astronomy and Space Sciences, 2023
The gamma beam system under construction at the ELI-NP facility in Romania is projected to give the nuclear physics community access to an experimental system providing a high-intensity, narrow bandwidth photon beam at variable energy.
P.-A. Söderström, A. Kuşoğlu, A. Kuşoğlu, D. Testov   +3 more
doaj   +1 more source