Results 71 to 80 of about 52,014 (259)

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

Explosive Nucleosynthesis of Weak r-Process Elements in Extremely Metal-Poor Core-Collapse Supernovae

, 2008
There have been attempts to fit the abundance patterns of extremely metal-poor stars with supernova nucleosynthesis models for the lighter elements than Zn. On the other hand, observations have revealed that the presence of EMP stars with peculiarly high
Aoki, Chieffi, Frölich, Heger, Heger, Hideyuki Umeda, Honda, Honda, Iwamoto, Maeda, Nagataki, Natsuko Izutani, Nozomu Tominaga, Popham, Pruet, Pruet, Pruet, Pruet, Qian, Sneden, Sneden, Tominaga, Tominaga, Travaglio, Umeda, Umeda, Wanajo, Wanajo, Yoshida   +28 more
core   +1 more source

Primordial Nucleosynthesis, Cosmic Microwave Background and Neutrinos [PDF]

, 2000
We report the results of a recent likelihood analysis combining the primordial nucleosynthesis and the BOOMERanG and MAXIMA-1 data on cosmic microwave background radiation anisotropies.
Mangano, G., Melchiorri, A., Pisanti, O.
core   +2 more sources

Mass‐Loss, Composition and Observational Signatures of Stellar Winds From X‐Ray Bursts

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT X‐Ray bursts (XRBs) are powerful thermonuclear events on the surface of accreting neutron stars (NSs), which can synthesize intermediate‐mass elements. Although the high surface gravity prevents an explosive ejection, a small fraction of the envelope may be ejected by radiation‐driven winds.
Yago Herrera, Daniel Muñoz Vela, Gloria Sala, Jordi José, Yuri Cavecchi   +4 more
wiley   +1 more source

Experimental Nuclear Astrophysics With the Light Elements Li, Be and B: A Review

Frontiers in Astronomy and Space Sciences, 2021
Light elements offer a unique opportunity for studying several astrophysical scenarios from Big Bang Nucleosynthesis to stellar physics. Understanding the stellar abundances of light elements is key to obtaining information on internal stellar structures
G.G. Rapisarda, L. Lamia, L. Lamia, L. Lamia, A. Caciolli, A. Caciolli, Chengbo Li, Chengbo Li, S. Degl’Innocenti, S. Degl’Innocenti, R. Depalo, R. Depalo, S. Palmerini, S. Palmerini, R.G. Pizzone, S. Romano, S. Romano, S. Romano, C. Spitaleri, E. Tognelli, E. Tognelli, Qungang Wen   +21 more
doaj   +1 more source

An Analytical Method for Quantification of Sn Isotope Variations in Geological Materials Using MC‐ICP‐MS

Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 863-885, December 2024.
Key Points A method is described to obtain high precision Sn isotope ratios using the double spike technique in geological reference materials containing 0.03 to 7 μg g−1 of Sn. δ122/118Sn values are reported for sixteen geological RMs. Improved precision was achieved compared with previous studies by using low concentration Sn analyte.
Dipankar Pathak, Klaus Mezger
wiley   +1 more source

Theoretical Predictions of Surface Light Element Abundances in Protostellar and Pre-Main Sequence Phase

Frontiers in Astronomy and Space Sciences, 2021
Theoretical prediction of surface stellar abundances of light elements–lithium, beryllium, and boron–represents one of the most interesting open problems in astrophysics.
E. Tognelli, E. Tognelli, S. Degl’Innocenti, S. Degl’Innocenti, P. G. Prada Moroni, P. G. Prada Moroni, L. Lamia, L. Lamia, L. Lamia, R. G. Pizzone, A. Tumino, A. Tumino, C. Spitaleri, C. Spitaleri, A. Chiavassa   +14 more
doaj   +1 more source

Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model

, 2005
This article presents an original code for Big Bang Nucleosynthesis in a baryon inhomogeneous model of the universe. In this code neutron diffusion between high and low baryon density regions is calculated simultaneously with the nuclear reactions and ...
G. Steigman, J. Barrow, J. Lara, J. Lara, J. F. Lara, Juan F. Lara, S. de Groot, T. Kajino, Y. Zeldovich   +8 more
core   +1 more source

Detection of Inconsistencies in Isotope Ratios Certified in the Isotopic Primary Standards for Copper, Zinc and Nickel

Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 795-805, December 2024.
Key Points Isotopic reference materials are rarely cross‐examined. An optimised regression model and MC‐ICP‐MS offer a cost‐effective way to assess the reliability of values assigned to multi‐isotope reference materials. A significant lack of consistency has been observed in the long‐standing isotopic reference materials for nickel and zinc. Calibrated
Juris Meija, Juan He, Brad Methven, Zoltán Mester, Lu Yang   +4 more
wiley   +1 more source

Nucleosynthesis in Thermonuclear Supernovae [PDF]

, 2017
The explosion energy of thermonuclear (Type Ia) supernovae is derived from the difference in nuclear binding energy liberated in the explosive fusion of light 'fuel' nuclei, predominantly carbon and oxygen, into more tightly bound nuclear 'ash' dominated by iron and silicon group elements.
Dean M. Townsley, Ivo R. Seitenzahl
openaire   +3 more sources