The s Process and Beyond [PDF]
Annual Review of Nuclear and Particle Science, 2023 Neutron captures produce the vast majority of abundances of elements heavier than iron in the Universe. Beyond the classical slow ( s) and rapid ( r) processes, there is observational evidence for neutron-capture processes that operate at neutron ...
M. Lugaro +3 more
semanticscholar +1 more source
Barium stars as tracers of s-process nucleosynthesis in AGB stars. I. 28 stars with independently derived AGB mass [PDF]
Astronomy & Astrophysics, 2022 Barium (Ba) stars are polluted by material enriched in the slow neutron capture (s-process) elements synthesised in the interior of their former asymptotic giant branch (AGB) companion star, which is now a white dwarf.
B. Cseh +9 more
semanticscholar +1 more source
Direct Measurement of the ^{13}C(α,n)^{16}O Cross Section into the s-Process Gamow Peak. [PDF]
Physical Review Letters, 2021 One of the main neutron sources for the astrophysical s process is the reaction ^{13}C(α,n)^{16}O, taking place in thermally pulsing asymptotic giant branch stars at temperatures around 90 MK. To model the nucleosynthesis during this process the reaction
G. Ciani +48 more
semanticscholar +1 more source
The Stellar β-decay Rate of 134Cs and Its Impact on the Barium Nucleosynthesis in the s-process [PDF]
Astrophysical Journal Letters, 2021 We have calculated the stellar β-decay rate of the important s-process branching point 134Cs based on the state-of-the-art shell model calculations. At typical s-process temperatures (T ∼ 0.2–0.3 GK), our new rate is one order of magnitude lower than the
Kuo-Ang Li +7 more
semanticscholar +1 more source
s-Processing in Asymptotic Giant Branch Stars in the Light of Revised Neutron-Capture Cross Sections
Universe, 2021 Current AGB stellar models provide an adequate description of the s-process nucleosynthesis that occurs. Nonetheless, they still suffer from many uncertainties related to the modeling of the 13C pocket formation and the adopted nuclear reaction rates ...
Diego Vescovi, René Reifarth
doaj +1 more source
First Results of the 140Ce(n,γ)141Ce Cross-Section Measurement at n_TOF
Universe, 2021 An accurate measurement of the 140Ce(n,γ) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large
Simone Amaducci +129 more
doaj +1 more source
Decay properties of 22Ne + α resonances and their impact on s-process nucleosynthesis [PDF]
Physics Letters B, 2020 The astrophysical $s$-process is one of the two main processes forming elements heavier than iron. A key outstanding uncertainty surrounding $s$-process nucleosynthesis is the neutron flux generated by the ${}^{22}\mathrm{Ne}(\alpha, n){}^{25}\mathrm{Mg}$
S. Ota +17 more
semanticscholar +1 more source
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
Mixing and Magnetic Fields in Asymptotic Giant Branch Stars in the Framework of FRUITY Models
Universe, 2021 In the last few years, the modeling of asymptotic giant branch (AGB) stars has been much investigated, both focusing on nucleosynthesis and stellar evolution aspects. Recent advances in the input physics required for stellar computations made it possible
Diego Vescovi
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 +24 more
doaj +1 more source