27 Result(s)
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Article
F.-K. Thielemann
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Observatory science with eXTP
In this White Paper we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to Observatory Science targets. These include flaring stars, supernova remnants, acc...
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Editorial to the Topical Collection on Supernovae
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Determination of the Galaxy age by the method of uranium–thorium–plutonium isotopic ratios
The dependence of the Galaxy age (Т G), as determined by the method of uranium–thorium isotopic ratios, on the parameters of the nucleosynthesis model is studied within the theory ...
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Half-life of short-lived neutron-excess nuclei that participate in the r-process
A quasi-classic model of a strength function based on finite Fermi systems is used to predict β-decay periods for neutron-excess nuclei. The results from calculations are compared to experimental data and othe...
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Influence of spontaneous fission rates on the yields of superheavy elements in the r-process
The formation of heavy elements in the neutron star merger scenario is considered. In such a scenario, the duration of the r-process is long and when the nucleosynthesis wave passes through the region of actinide...
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Probabilities of delayed processes for nuclei involved in the r-process
Delayed fission, along with induced and spontaneous fission, is responsible for the suppression of the production of superheavy elements both during the r-process and after its completion. Beta-decay strength ...
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Have superheavy elements been produced in nature?
We discuss the possibility whether superheavy elements can be produced in Nature by the astrophysical rapid neutron capture process. To this end we have performed fully dynamical network r-process calculations...
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Neutron-induced reaction rates for the r-process
Neutron-induced reaction rates for the formation of heavy and superheavy nuclei in the astrophysical r-process are presented. Neutron-induced reactions, including fission and neutron capture, at astrophysical tem...
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Superheavy elements and r-process
The probability for the production of superheavy elements in the astrophysical r-process is discussed. The dependence of the estimated superheavy-element yields on input data is estimated. Preliminary calculat...
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The r-Process in the region of transuranium elements and the contribution of fission products to the nucleosynthesis of nuclei with A ≤ 130
We discuss the influence of nuclear masses and mass distributions of fission products on the formation of heavy elements at the final stages of the r-process recycled through fission on long duration timescales. ...
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(n,γ) cross-sections of light p nuclei
The nucleosynthesis of elements beyond iron is dominated by the s and r processes. However, a small amount of stable isotopes on the proton-rich side cannot be made by neutron capture and is thought to be produce...
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Fission and the r-process: Competition between neutron-induced and beta-delayed fission
We show that for the discussed scenario of a neutron-star merger in highly neutronized ejecta (Y e ⊃0.1), neutron-induced fission plays a major role in the r-process cycling and...
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Fission and the r-process: The rates of induced and delayed fission
The most recent fission-barrier calculations based on improved mass formulas indicate that the adopted values are underestimated. We analyze the dependence of the fission rates on the fission barrier and show ...
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Nuclear-reaction rates in the thermonuclear runaway phase of accreting neutron stars
The rp-process has been suggested as the dominant nucleosynthesis process in explosive hydrogen burning at high temperature and density conditions. The process is characterized by a sequence of fast proton cap...
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Nucleosynthesis and Stellar Evolution
Two of the basic building blocks of galaxies are stars and the interstellar medium. The evolution of the abundance composition in the latter and especially the enrichment of heavy elements as a function of spa...
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Heavy Elements and Age Determinations
The age of the universe, measured from the Big Bang to the present, is at the focus of cosmology. Its determination relies, however, on the use of stellar objects or their products. Stellar explosions, like ty...
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Element Abundance Patterns of Metal-Poor Halo Stars
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Nucleosynthesis of heavy elements: Computational experiment
The kinetic-model (KM) efficiency in heavy-element nucleosynthesis calculations is analyzed. Various nucleosynthesis conditions and various mathematical models are considered. All basic two-particle reactions ...
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The role of strange sea quarks on neutrino-nucleus reactions in Superkamiokande and in the supernova r-process
We study the influence of a strange axial vector form factor Gs of the nucleon on the neutrino-induced proton and neutron knockout of 16O. In particular, we calculate how much Gs≠0 might affect the recently prop...
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Nuclear physics far from stability and explosive nucleosynthesis processes
In this paper, we discuss the astrophysically relevant nuclear-physics input for a selected set of explosive nucleosynthesis scenarios leading to rapid protonand neutron-capture processes. Observables (like,e.g.,...
