Results 81 to 90 of about 52,754 (240)

Observing the signatures of AGB s-process nucleosynthesis in planetary nebulae: An origins story

Frontiers in Astronomy and Space Sciences, 2022
I relate an anecdotal history of the beginnings of a new initiative in studies of the chemical composition of planetary nebulae: namely, investigating abundances of elements beyond the iron-peak through infrared spectroscopy.
Harriet L. Dinerstein
doaj   +1 more source

Absence of a Lower Limit on Omega_b in Inhomogeneous Primordial Nucleosynthesis

, 1994
We show that a class of inhomogeneous big bang nucleosynthesis models exist which yield light-element abundances in agreement with observational constraints for baryon-to-photon ratios significantly smaller than those inferred from standard homogeneous ...
Fuller, G. M., Jedamzik, K., Mathews, G. J.   +2 more
core   +1 more source

The evolution and history of Vinca alkaloids: From the Big Bang to the treatment of pediatric acute leukemia

Pediatric Blood &Cancer, Volume 71, Issue 11, November 2024.
Abstract An attractive flower from the island of Madagascar has in part saved the lives of thousands of children with acute lymphoblastic leukemia (ALL). Random mutations and alterations to the genome led to the evolution of genes encoding enzymes, which would provide the periwinkle flower an arsenal of secondary metabolites to survive within the ...
Jeffrey W. Taub, Steven A. Buck, Ana C. Xavier, Holly Edwards, Larry H. Matherly, Yubin Ge   +5 more
wiley   +1 more source

Nucleosynthesis Without Computer [PDF]

International Journal of Theoretical Physics, 2004
I derive completely analytically the time evolution and final abundances of the light elements (up to Be-7) formed in the big-bang nucleosynthesis.This highlights an interesting physics taking place during the formation of light elements in the early universe.
openaire   +3 more sources

Light Elements in the Universe

Frontiers in Astronomy and Space Sciences, 2021
Due to their production sites, as well as to how they are processed and destroyed in stars, the light elements are excellent tools to investigate a number of crucial issues in modern astrophysics: from stellar structure and non-standard processes at work
Sofia Randich, Laura Magrini
doaj   +1 more source

A Novel Approach to β-Decay: PANDORA, a New Experimental Setup for Future In-Plasma Measurements

Universe, 2022
Theoretical predictions as well as experiments performed at storage rings have shown that the lifetimes of β-radionuclides can change significantly as a function of the ionization state.
David Mascali, Domenico Santonocito, Simone Amaducci, Lucio Andò, Vincenzo Antonuccio, Sándor Biri, Alfio Bonanno, Vincenza Piera Bonanno, Stefan Briefi, Maurizio Busso, Luigi Celona, Luigi Cosentino, Sergio Cristallo, Marco Cuffiani, Costantino De Angelis, Giacomo De Angelis, Davide De Salvador, Loreto Di Donato, Jean-Eric Ducret, Aref Eshkevar Vakili, Ursel Fantz, Alessio Galatà, Carmelo Sebastiano Gallo, Santo Gammino, Tommaso Isernia, Hannu Koivisto, Karl-Ludwig Kratz, Risto Kronholm, Marco La Cognata, Silvia Leoni, Andrea Locatelli, Mario Maggiore, Fabio Maimone, Luciana Malferrari, Giorgio Mancini, Laurent Maunoury, Giorgio Sebastiano Mauro, Maria Mazzaglia, Alberto Mengoni, Andrea Miraglia, Bharat Mishra, Mario Musumeci, Daniel Ricardo Napoli, Eugenia Naselli, Fabrizio Odorici, Libero Palladino, Giuseppe Palmisano, Santi Pavone, Salvatore Pennisi, Albino Perego, Angelo Pidatella, Richard Rácz, Riccardo Reitano, Danilo Rifuggiato, Matteo Rinaldi, Antonio Domenico Russo, Filippo Russo, Gaetano Schillaci, Stefano Selleri, Stefano Simonucci, Gino Sorbello, Roberta Spartà, Simone Taioli, Klaus Tinschert, Giuseppe Torrisi, Antonio Trifirò, Sedina Tsikata, Aurora Tumino, Diego Vescovi, Luca Vincetti   +69 more
doaj   +1 more source

Effects of a torsion field on Big Bang nucleosynthesis

, 1999
In this paper it is investigated whether torsion, which arises naturally in most theories of quantum gravity, has observable implications for the Big Bang nucleosynthesis.
C. N. Yang, D. Sciama, E. Cremmer, G. Papadopoulos, I. L. Buchbinder, J. M. Cline, M. Bruggen, M. Brüggen, M. Kalb, M. Khlopov, P. J. E. Peebles, P. S. Howe, R. Barbieri, R. T. Hammond, R. T. Hammond, R. T. Hammond, S. Capozziello, T. Kibble, X. Shi   +18 more
core   +1 more source

Hypernova Nucleosynthesis and Galactic Chemical Evolution [PDF]

, 2001
We study nucleosynthesis in 'hypernovae', i.e., supernovae with very large explosion energies ($ \gsim 10^{52} $ ergs) for both spherical and aspherical explosions.
AI Macfadyen, AM Khokhlov, B Paczynski, C Sneden, D Argast, F-K Thielemann, G Nelemans, H Umeda, H Umeda, I Hachisu, I Hachisu, J Sollerman, K Iwamoto, K Iwamoto, K Iwamoto, K Maeda, K Maeda, K Nomoto, K Nomoto, K Nomoto, LAJ Blake, LM Germany, M Hashimoto, Nakamura, P Podsiadlowski, PA Mazzali, S Nagataki, SG Ryan, Shigeyama. T., amp Tsujimoto, T, TG Tsuru, V Bromm, WD Arnett, WN Brandt   +32 more
core   +2 more sources

Precise Measurement of Magnesium Isotopes in Fe‐Mg Minerals Using a Multi‐collector SHRIMP Ion Microprobe

Geostandards and Geoanalytical Research, Volume 48, Issue 2, Page 331-343, June 2024.
Key Points Corrected for the Earth's magnetic field, the SHRIMP's IMF depends on the mineral species, not the chemical composition. The IMF arises from the force constant difference between "hard" and "soft" bonds, which is characteristic of each mineral. This permitted the calculation of IMF‐correction factors for most common Mg‐bearing minerals.
Fernando Bea, Pilar Montero, Delia Ortega, José F. Molina, Aitor Cambeses, Leticia Barcos, Shui‐Jiong Wang, Shan Ke   +7 more
wiley   +1 more source

Production of Lithium and Heavy Elements in AGB Stars Experiencing PIEs

Galaxies
Asymptotic giant branch (AGB) stars can experience proton ingestion events (PIEs), leading to a rich nucleosynthesis. During a PIE, the intermediate neutron capture process (i-process) develops, leading to the production of trans-iron elements.
Arthur Choplin, Lionel Siess, Stephane Goriely, Sebastien Martinet   +3 more
doaj   +1 more source