Synthesis of actinides and short-lived radionuclides during i-process nucleosynthesis in AGB stars

IF 2.6 3区 物理与天体物理 Q2 PHYSICS, NUCLEAR
Arthur Choplin, Stephane Goriely, Lionel Siess, Sébastien Martinet
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引用次数: 0

Abstract

A complex interplay between mixing and nucleosynthesis is at work in asymptotic giant branch (AGB) stars. In addition to the slow neutron capture process (s-process), the intermediate neutron capture process (i-process) can develop during proton ingestion events (PIEs). In this paper, after quickly reviewing the different modes of production of heavy elements in AGB stars that have been identified so far, we investigate the synthesis of actinides and other short-lived radioactive nuclei (SLRs, \(^{60}\)Fe, \(^{107}\)Pd, \(^{126}\)Sn, \(^{129}\)I, \(^{135}\)Cs, and \(^{182}\)Hf) during i-process nucleosynthesis. AGB stellar models with initial masses \(1 \le M_\textrm{ini}/M_{\odot }\le 3\), metallicities \(-3 \le \) [Fe/H] \( \le 0\), and different overshoot strengths were computed with the stellar evolution code STAREVOL. During PIEs, a nuclear network of 1160 isotopes is used and coupled to the transport equations. We found that AGB models with [Fe/H] \(<-2\) can synthesize actinides with abundances sometimes greater than solar values. The \(^{60}\)Fe yield scales with the initial metallicity, while the \(^{107}\)Pd, \(^{126}\)Sn, \(^{129}\)I, \(^{135}\)Cs, and \(^{182}\)Hf yields follow a similar pattern as a function of metallicity, with a production peak at [Fe/H] \(\simeq -1.3\). At [Fe/H] \(<-1\), the fraction of odd Ba isotopes \(f_\textrm{Ba,odd}\) is predicted to vary between 0.6 and 0.8 depending on the initial mass and metallicity. Nuclear uncertainties on our 1\(~M_{\odot }\)  [Fe/H] \(=-2.5\) model lead to \(f_\textrm{Ba,odd}\) ranging between 0.27 and 0.76, which is clearly above the s-process value. AGB stars experiencing PIEs appear to be potential producers of actinides and SLRs, particularly at low metallicity (except for \(^{60}\)Fe). Galactic chemical evolution modelling is required to assess their possible contribution to the galactic enrichment.

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来源期刊
The European Physical Journal A
The European Physical Journal A 物理-物理:核物理
CiteScore
5.00
自引率
18.50%
发文量
216
审稿时长
3-8 weeks
期刊介绍: Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.
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