Results 11 to 20 of about 12,181 (205)

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.
Ken'ichi Nomoto, Paolo A. Mazzali, Hideyuki Umeda, J. Deng, Takuya Ohkubo, Keiichi Maeda   +5 more
openaire   +3 more sources

Mergers of Binary Neutron Star Systems: A Multimessenger Revolution

Frontiers in Astronomy and Space Sciences, 2021
On August 17, 2017, less than two years after the direct detection of gravitational radiation from the merger of two∼30 M⊙ black holes, a binary neutron star merger was identified as the source of a gravitational wave signal of ∼100 s duration that ...
Elena Pian
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
doaj   +1 more source

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, M. La Cognata, G. L. Guardo, G. L. Guardo, S. Palmerini, S. Palmerini, M. L. Sergi, M. L. Sergi, G. D’Agata, G. D’Agata, L. Lamia, L. Lamia, L. Lamia, D. Lattuada, D. Lattuada, A. A. Oliva, A. A. Oliva, R. G. Pizzone, G. G. Rapisarda, G. G. Rapisarda, S. Romano, S. Romano, S. Romano, A. Tumino, A. Tumino   +24 more
doaj   +1 more source

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, Domenico Santonocito, Simone Amaducci, Luigi Celona, Alessio Galatà, Alain Goasduff, Giorgio Sebastiano Mauro, Maria Mazzaglia, Bharat Mishra, Daniel R. Napoli, Angelo Pidatella, Giuseppe Torrisi, David Mascali   +12 more
doaj   +1 more source

Kilonova Emission and Heavy Element Nucleosynthesis

Universe, 2023
The binary neutron star merger observed and localized on 17 August 2017 by the LIGO and Virgo gravitational interferometers and by numerous telescopes on the ground and in orbit linked in an unambiguous way the coalescence of double neutron stars with ...
Elena Pian
doaj   +1 more source

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

Isomers in the Cosmos

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
doaj   +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