Neutron capture cross-sections of stable xenon isotopes and their application in stellar nucleosynthesis

  title={Neutron capture cross-sections of stable xenon isotopes and their application in stellar nucleosynthesis},
  author={Hermann Beer and Franz Käppeler and Gianni Reffo and G. Venturini},
  journal={Astrophysics and Space Science},
The neutron capture cross-sections of124, 132, 134Xe have been measured by the activation technique at 25 keV neutron energy. These data were supplemented by calculated capture cross-sections for128, 129, 130, 131Xe via the statistical model. The complete set of capture cross-sections obtained in this way served to determine the solar xenon abundance throughs-process systematics and to study a variety of isotopic anomalies. 
Neutron capture cross sections for s-process studies
Abstract Existing experimental and calculated neutron capture cross sections in the keV energy range have been surveyed, properly renormalized if necessary, and converted into Maxwellian averagesExpand
Average radiation widths of levels in natural xenon isotopes
Average radiation widths 〈Γγ〉 for the stable xenon isotopes have been estimated using neutron resonance spectroscopic information deduced from high-resolution capture and transmission data measuredExpand
Pulsed-Neutron-Source Models for the Astrophysical S-Process
The astrophysical s-process is a sequence of neutron-capture and beta-decay reactions on a slow time scale compared to beta-decay lifetimes near the line of stability. We systematically study thisExpand
The s-process of stellar nucleosynthesis
Abstract The present status of our understanding of the s process of stellar nucleosynthesis is reviewed from the point of view of nuclear physics. Observed abundances of chemical elements and theirExpand
Neutron capture process in astrophysics
The development of the field of study of neutron capture processes in astrophysics is reviewed as a gradual evolution of improving microscopic input nuclear physics coupled with more sophisticatedExpand
The even-odd systematics in R-process nuclide abundances
We report and discuss solar system N R abundances for nuclides A > 70, obtained as differences between measured solar system abundances and calculated S-process contributions. The abundance peak at AExpand
Nuclear information needs for the astrophysical s-process
The astrophysical s-process is a sequence of neutron-capture and beta-decay reactions on a slow time scale compared to beta-decay lifetimes near the line of stability. We systematically study thisExpand
s-process nucleosynthesis-nuclear physics and the classical model
Among the various processes responsible for the formation of the heavy elements in stars, the slow neutron capture process (s-process) is distinguished by the fact that it involves mostly stableExpand
Nucleosynthesis contributions to the solar nebula
  • M. Arnould
  • Physics, Engineering
  • Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
  • 1987
The discovery of isotopic anomalies in meteorites suggests that the Solar System is made of material from compositionally different and imperfectly mixed reservoirs. One of them, which comprises theExpand
Temporal variations of low-energy cosmic-ray protons on decadal and million year time-scales: Implications to their origin
We discuss the present day information on the prehistoric proton radiation in the solar system at 1 AU based on activation of lunar surface materials, in relation to our present day knowledge ofExpand


Nucleosynthesis and Neutron-Capture Cross Sections
The role of neutron capture reactions in the nucleosynthesis of heavy elements in stars is reviewed. Maxwellian-averaged capture cross sections at 30 keV are presented for most isotopes across theExpand
Fast Neutron Capture Cross Sections and Related Gamma-Ray Spectra of Niobium-93, Rhodium-103, and Tantalum-181
The capture cross sections of /sup 93/-Nb, /sup 103/Rh, and /sup 181/Ta were measured in the 10- to 70-keV neutron energy range, using /sup 197/Au as a standard. Hauser-Feshbach calculations wereExpand
Beta decay rates forS-process studies
The rates for a variety of beta decay processes have been determined as a function of temperature for nuclei which can participate in thes-process production of heavy elements, occurring in theExpand
30 keV (n, γ) cross-sections from the nuclear statistical model
Global input parameters for a Hauser-Feshbach calculation of astrophysical nuclear reaction rates are evaluated; wherever possible they are expressed as systematic functions of nucleon numbersN andZExpand
s-Process Studies In the Light of New Experimental Cross Sections: Distribution of Neutron Fluences and r-Process Residuals
A best set of neutron-capture cross section has been evaluated for the most important s-process isotopes. With this data base, s-process studies have been carried out using the traditional modelExpand
Neutron capture time scale of the s-process, estimated from s-process krypton in a meteorite
A krypton fraction enriched in s-process isotopes was extracted from a mineral fraction of the Murchison C2 chondrite. The (Kr-86)/(Kr-84) ratio is enhanced by 6 standard deviations, showing thatExpand
Neutron capture chains in heavy element synthesis
Abstract This paper is concerned with stellar neutron capture processes which occur at a rate slow compared to the intervening beta decays, the so-called s-process in the synthesis of the elements.Expand
Alternative hypothesis for the origin of CCF xenon
I SUGGEST that the anomalous xenon isotopic composition known as carbonaceous chondrite fission (CCF) xenon is not caused by fission, but is the direct result of a modified r-process nucleosynthesisExpand
s-process studies - Xenon and krypton isotopic abundances
We propose an analysis of the s-process contributions to the isotopes of xenon and krypton. The object is to aid studies of the possibility that meteorites may contain gas that was carried inExpand
Effects of unthermalized isomeric states and of a time-varying neutron flux of s-process branching ratios
A study has been made of branched s-process nucleosynthesis in the convective helium shells that appear in intermediate-mass red giant during thermal pulses. It is shown that, even though the averageExpand