Results 41 to 50 of about 767 (211)

Impact of Nuclear Reaction Rate Uncertainties on Type I X-Ray Burst Nucleosynthesis: A Monte Carlo Study

The Astrophysical Journal
Type I X-ray bursts are thermonuclear flashes on the surface of accreting neutron stars, involving hundreds of nuclei and thousands of reactions with larger uncertainties in reaction rates. To investigate the impact of nuclear reaction rate uncertainties
Qing Wang, Ertao Li, Zhihong Li, Youbao Wang, Bing Guo, Yunju Li, Jun Su, Shipeng Hu, Yinwen Guan, Dong Xiang, Yu Liu, Lei Yang, Weiping Liu   +12 more
doaj   +1 more source

Variable Tl, Pb, and Cd concentrations and isotope compositions of enstatite and ordinary chondrites—Evidence for volatile element mobilization and decay of extinct 205Pb

Meteoritics &Planetary Science, Volume 53, Issue 2, Page 167-186, February 2018., 2018
Abstract New Tl, Pb, and Cd concentration and Tl, Pb isotope data are presented for enstatite as well as L‐ and LL‐type ordinary chondrites, with additional Cd stable isotope results for the former. All three chondrite suites have Tl and Cd contents that vary by more than 1–2 orders of magnitude but Pb concentrations are more uniform, as a result of ...
Emeliana Palk, Rasmus Andreasen, Mark Rehkämper, Alison Stunt, Katharina Kreissig, Barry Coles, Maria Schönbächler, Caroline Smith   +7 more
wiley   +1 more source

Origin of geochemical mantle components: Role of spreading ridges and thermal evolution of mantle

Geochemistry, Geophysics, Geosystems, Volume 18, Issue 2, Page 697-734, February 2017., 2017
Abstract We explore the element redistribution at mid‐ocean ridges (MOR) using a numerical model to evaluate the role of decompression melting of the mantle in Earth's geochemical cycle, with focus on the formation of the depleted mantle component. Our model uses a trace element mass balance based on an internally consistent thermodynamic‐petrologic ...
Jun‐Ichi Kimura, James B. Gill, Peter E. van Keken, Hiroshi Kawabata, Susanne Skora   +4 more
wiley   +1 more source

Proton-rich nucleosynthesis and nuclear physics [PDF]

, 2012
Although the detailed conditions for explosive nucleosynthesis are derived from astrophysical modeling, nuclear physics determines fundamental patterns in abundance yields, not only for equilibrium processes. Focussing on the nu p- and the gamma-process,
C. Fröhlich, Rauscher, T., T. Rauscher, Froehlich, C.   +3 more
core   +1 more source

Presupernova O–C Shell Mergers Could Produce More 44Ti than the Explosion

The Astrophysical Journal
The formation of ^44 Ti in massive stars is thought to occur during explosive nucleosynthesis; however, recent studies have shown it can be produced during O–C shell mergers prior to core collapse.
Joshua Issa, Falk Herwig
doaj   +1 more source

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

Irreversible Thermodynamic Description of Dark Matter and Radiation Creation during Inflationary Reheating

Advances in High Energy Physics, Volume 2017, Issue 1, 2017., 2017
We investigate matter creation processes during the reheating period of the early Universe, by using the thermodynamic of open systems. The Universe is assumed to consist of the inflationary scalar field, which, through its decay, generates relativistic matter and pressureless dark matter. The inflationary scalar field transfers its energy to the newly
Juntong Su, Tiberiu Harko, Shi-Dong Liang, Orlando Luongo   +3 more
wiley   +1 more source

Evolution, Explosion, and Nucleosynthesis of Core‐Collapse Supernovae

The Astrophysical Journal, 2003
We present a new set of presupernova evolutions and explosive yields of massive stars of initial solar composition (Y=0.285, Z=0.02) in the mass range 13-35 Msun. All the models have been computed with the latest version (4.97) of the FRANEC code that now includes a nuclear network extending from neutrons to Mo98. The explosive nucleosynthesis has been
Limongi, Marco, Chieffi, Alessandro
openaire   +5 more sources

Final stages of massive stars. SN explosion and explosive nucleosynthesis

, 2008
We review the presupernova evolution, the explosion and the explosive nucleosynthesis of massive stars in the range 11–120 M๏. We mainly focus on the advanced evolutionary phases prior to the explosion, i.e.
M. Limongi, A. Chieffi
core   +1 more source

Snowflakes in a Furnace: Formation of CO and Dust in a Recurrent Nova Eruption

The Astrophysical Journal Letters, 2023
We report the detection of carbon monoxide (CO) and dust, formed under hostile conditions, in recurrent nova V745 Sco about 8.7 days after its 2014 outburst. The formation of molecules or dust has not been recorded previously in the ejecta of a recurrent
D. P. K. Banerjee, C. E. Woodward, V. Joshi, A. Evans, F. M. Walter, G. H. Marion, E. Y. Hsiao, N. M. Ashok, R. D. Gehrz, S. Starrfield   +9 more
doaj   +1 more source