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Enhanced production of Fe in massive stars.
Nat Commun
November 2024
Lawrence Livermore National Laboratory, Livermore, CA, USA.
Massive stars are a major source of chemical elements in the cosmos, ejecting freshly produced nuclei through winds and core-collapse supernova explosions into the interstellar medium. Among the material ejected, long-lived radioisotopes, such as Fe (iron) and Al (aluminum), offer unique signs of active nucleosynthesis in our galaxy. There is a long-standing discrepancy between the observed Fe/Al ratio by γ-ray telescopes and predictions from supernova models.
View Article and Find Full Text PDFSearch for Na in novae supported by a novel method for measuring femtosecond nuclear lifetimes.
Nat Commun
September 2023
Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France.
Classical novae are thermonuclear explosions in stellar binary systems, and important sources of Al and Na. While γ rays from the decay of the former radioisotope have been observed throughout the Galaxy, Na remains untraceable. Its half-life (2.
View Article and Find Full Text PDFPreparation of stable and long-lived source samples for the stand-alone beam program at the Facility for Rare Isotope Beams.
Appl Radiat Isot
October 2023
Facility for Rare Isotope Beams, Michigan State University, 640 S Shaw Ln, East Lansing, MI, 48824, USA. Electronic address:
At the Facility for Rare Isotope Beams (FRIB), an oven-ion source combination was used to create rare isotope beams in support of the stand-alone user beam program of the ReAccelerator (ReA) facility. This ion source, called Batch-Mode Ion Source (BMIS), was loaded with enriched stable nuclides (Si, Cr, and Fe) and long-lived radionuclides (Al, Si). The introduced samples, herein designated as source samples, were thermally volatilized in the BMIS oven, and then ionization was used to generate the required beams.
View Article and Find Full Text PDFStochastic accretion of the Earth.
Nat Astron
July 2022
School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC 3800, Australia.
Chondritic meteorites are thought to be representative of the material that formed the Earth. However, the Earth is depleted in volatile elements in a manner unlike that in any chondrite, and yet these elements retain chondritic isotope ratios. Here we use N-body simulations to show that the Earth did not form from chondrites, but rather by stochastic accretion of many precursor bodies whose variable compositions reflect the temperatures at which they formed.
View Article and Find Full Text PDFCluster Analysis of Presolar Silicon Carbide Grains: Evaluation of Their Classification and Astrophysical Implications.
Astrophys J Lett
February 2021
Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.
Cluster analysis of presolar silicon carbide grains based on literature data for C/C, N/N, Si/Si, and Si/Si including or not inferred initial Al/Al data, reveals nine clusters agreeing with previously defined grain types but also highlighting new divisions. Mainstream grains reside in three clusters probably representing different parent star metallicities. One of these clusters has a compact core, with a narrow range of composition, pointing to an enhanced production of SiC grains in asymptotic giant branch (AGB) stars with a narrow range of masses and metallicities.
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