The \(^{12}\)C\((\alpha ,\gamma )^{16}\)O reaction, in the laboratory and in the stars

IF 2.6 3区 物理与天体物理 Q2 PHYSICS, NUCLEAR
R. J. de Boer, A. Best, C. R. Brune, A. Chieffi, C. Hebborn, G. Imbriani, W. P. Liu, Y. P. Shen, F. X. Timmes, M. Wiescher
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引用次数: 0

Abstract

The evolutionary path of massive stars begins at helium burning. Energy production for this phase of stellar evolution is dominated by the reaction path 3\(\alpha \rightarrow ^{12}\) C\((\alpha ,\gamma )^{16}\)O and also determines the ratio of \(^{12}\)C/\(^{16}\)O in the stellar core. This ratio then sets the evolutionary trajectory as the star evolves towards a white dwarf, neutron star or black hole. Although the reaction rate of the 3\(\alpha \) process is relatively well known, since it proceeds mainly through a single narrow resonance in \(^{12}\)C, that of the \(^{12}\)C\((\alpha ,\gamma )^{16}\)O reaction remains uncertain since it is the result of a more difficult to pin down, slowly-varying, portion of the cross section over a strong interference region between the high-energy tails of subthreshold resonances, the low-energy tails of higher-energy broad resonances and direct capture. Experimental measurements of this cross section require herculean efforts, since even at higher energies the cross section remains small and large background sources are often present that require the use of very sensitive experimental methods. Since the \(^{12}\)C\((\alpha ,\gamma )^{16}\)O reaction has such a strong influence on many different stellar objects, it is also interesting to try to back calculate the required rate needed to match astrophysical observations. This has become increasingly tempting, as the accuracy and precision of observational data has been steadily improving. Yet, the pitfall to this approach lies in the intermediary steps of modeling, where other uncertainties needed to model a star’s internal behavior remain highly uncertain.

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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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