Challenges in nucleosynthesis of trans-iron elements

Abstract

Nucleosynthesis beyond Fe poses additional challenges not encountered when studying astrophysical processes involving light nuclei. Astrophysical sites and conditions are not well known for some of the processes involved. On the nuclear physics side, different approaches are required, both in theory and experiment. The main differences and most important considerations are presented for a selection of nucleosynthesis processes and reactions, specifically the $s$-, $r$-, $\gamma$-, and $\nu p$-processes. Among the discussed issues are uncertainties in sites and production conditions, the difference between laboratory and stellar rates, reaction mechanisms, important transitions, thermal population of excited states, and uncertainty estimates for stellar rates. The utility and limitations of indirect experimental approaches are also addressed. The presentation should not be viewed as confining the discussed problems to the specific processes. The intention is to generally introduce the concepts and possible pitfalls along with some examples. Similar problems may apply to further astrophysical processes involving nuclei from the Fe region upward and/or at high plasma temperatures. The framework and strategies presented here are intended to aid the conception of future experimental and theoretical approaches.

19 pages, 6 figures; to appear in AIP Advances, Special Topic: Stardust: Progress and Problems in Nuclear Astrophysics

References in corpus (54)

• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures
• Astrophysical Reaction Rates From Statistical Model Calculations
• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• The s Process: Nuclear Physics, Stellar Models, Observations
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• Neutrino-induced nucleosynthesis of A>64 nuclei: The nu p-process
• The endpoint of the rp process on accreting neutron stars
• Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?
• Models for Type I X-Ray Bursts with Improved Nuclear Physics
• Nuclear Level Density and the Determination of Thermonuclear Rates for Astrophysics
• Where, oh where has the r-process gone?
• The Physics of Protoneutron Star Winds: Implications for r-Process Nucleosynthesis
• Constraining the astrophysical origin of the p-nuclei through nuclear physics and meteoritic data
• Nucleosynthesis in Early Supernova Winds II: The Role of Neutrinos
• Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows. I. Spherically symmetric hydrodynamic simulations
• Neutron-capture elements in the very metal-poor star HD122563
• Composition of the Innermost Core Collapse Supernova Ejecta
• Charged-Particle and Neutron-Capture Processes in the High-Entropy Wind of Core-Collapse Supernovae
• Charged-current weak interaction processes in hot and dense matter and its impact on the spectra of neutrinos emitted from proto-neutron star cooling
• Medium modification of the charged current neutrino opacity and its implications
• The rp-Process in Neutrino-driven Winds
• Sensitivity of p-Process Nucleosynthesis to Nuclear Reaction Rates in a 25 Solar Mass Supernova Model
• Type Ia Supernovae as Sites of p-process: Two-Dimensional Models Coupled to Nucleosynthesis
• New fission fragment distributions and r-process origin of the rare-earth elements
• Neutrino-driven wind simulations and nucleosynthesis of heavy elements
• Core-collapse supernova explosions triggered by a quark-hadron phase transition during the early post-bounce phase
• Uncertainties in the nu p-process: supernova dynamics versus nuclear physics
• The Path to Improved Reaction Rates for Astrophysics
• Branchings in the gamma-process path revisited
• Relevant energy ranges for astrophysical reaction rates
• Lead: Asymptotic Giant Branch production and Galactic Chemical Evolution
• Sensitivity of astrophysical reaction rates to nuclear uncertainties
• Alpha-induced cross sections of 106Cd for the astrophysical p-process
• Formation Of The Rare Earth Peak: Gaining Insight Into Late-Time r-Process Dynamics
• Nucleosynthesis in Magnetically Driven Jets from Collapsars
• A New Code for Proto-Neutron Star Evolution
• Experimental simulation of a stellar photon bath by bremsstrahlung: the astrophysical $\gamma$-process
• Dependence of direct neutron capture on nuclear-structure models
• Cold r-Process in Neutrino-Driven Winds
• Capture of alpha Particles by Isospin-Symmetric Nuclei
• The s-process branching at 185W
• Opportunities to constrain astrophysical reaction rates for the s-process through determination of the ground state cross sections
• Suppression of the stellar enhancement factor and the reaction 85Rb(p,n)85Sr
• Impact of supernova dynamics on the νp-process
• s-process branching at 185W revised
• Solution of the alpha-potential mystery in the gamma-process and its impact on the Nd/Sm ratio in meteorites
• Astrophysical relevance of $\gamma$ transition energies
• Nucleosynthesis in core-collapse supernova explosions triggered by a quark-hadron phase transition
• Neutron Capture in the r-Process -- Do We Know Them And Does It Make Any Difference?
• General properties of astrophysical reaction rates in explosive nucleosynthesis
• Suppression of Excited-State Contributions to Stellar Reaction Rates
• Proton-rich nucleosynthesis and nuclear physics

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• Uncertainties in the production of $p$ nuclei in massive stars obtained from Monte Carlo variations
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• Testing the role of SNe Ia for Galactic chemical evolution of p-nuclei with 2D models and with s-process seeds at different metallicities
• Radiogenic p-isotopes from SNIa, nuclear physics uncertainties and Galactic chemical evolution compared with values in primitive meteorites
• Mass Measurements of Neutron-Deficient Y, Zr, and Nb Isotopes and Their Impact on $rp$ and $\nu p$ Nucleosynthesis Processes
• Alpha induced reaction cross section measurements on 162Er for the astrophysical gamma process
• Uncertainties in $\nu$p-process nucleosynthesis from Monte Carlo variation of reaction rates
• Experimental cross sections of 165Ho(α,n)168Tm and 166Er(α,n)169Yb for optical potential studies relevant for the astrophysical γ-process
• Measurements of ${}^{152}$Gd(p,$\gamma$)${}^{153}$Tb and ${}^{152}$Gd(p,n)${}^{152}$Tb reaction cross sections for the astrophysical $\gamma$ process
• Test of statistical model cross section calculations for $\alpha$-induced reactions on ${}^{107}$Ag at energies of astrophysical interest
• Measurement of (alpha,n) reaction cross sections of erbium isotopes for testing astrophysical rate predictions
• Experimental study of the astrophysical gamma-process reaction 124Xe(alpha,gamma)128Ba
• Feasibility of studying astrophysically important charged-particle emission with the variable energy $\gamma$-ray system at the Extreme Light Infrastructure -- Nuclear Physics facility
• Photonuclear Reactions in Astrophysics
• Production of Quasi-Stellar Neutron Field at Explosive Stellar Temperatures
• Impact of Uncertainties in Astrophysical Reaction Rates on Nucleosynthesis in the $\nu p$ Process
• Nuclear Reactions For Nucleosynthesis Beyond Fe
• Monte Carlo variations as a tool to assess nuclear physics uncertainties in nucleosynthesis studies
• Abundance Uncertainties Obtained With the PizBuin Framework For Monte Carlo Reaction Rate Variations
• Impact of Uncertainties in Nuclear Reaction Cross Sections on p-Nucleosynthesis in Thermonuclear Supernovae
• Successful $\nu p$-process in neutrino-driven outflows in core-collapse supernovae
• Theory Considerations For Nucleosynthesis Beyond Fe With Special Emphasis On p-Nuclei In Massive Stars
• Production Uncertainties of p-Nuclei in the $\gamma$-Process in Massive Stars Using a Monte Carlo Approach
• Astrophysical Reaction Rates for Charged-Particle Induced Reactions on Proton-Rich Nuclides