Fusion reactions in multicomponent dense matter

Yakovlev, D. G.; Gasques, L. R.; Afanasjev, A. V.; Beard, M.; Wiescher, M.

doi:10.1103/physrevc.74.035803

Cited by 137 publications

(256 citation statements)

References 53 publications

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“…Their physics is described, for instance, by Salpeter and Van Horn [5] and applied in later work (e.g. [6,7,25,31] and references therein). Pycnonuclear reactions occur at high densities and involve very neutron-rich nuclei [16,17], immersed in a see of free neutrons available in the inner crust.…”

Section: Studying Uncertainties Of S(e)mentioning

confidence: 99%

“…S(E)-factors calculated using the São Paulo potential have been compared previously [6,25,28] with experimental data and with theoretical calculations performed using other models such as coupled-channels and fermionic molecular dynamics ones. Let us stress that the calculated values of S(E) are uncertain due to nuclear physics effects -due to using the São Paulo model with the NL3 nucleon density distribution.…”

Section: Calculationsmentioning

confidence: 99%

“…Also, the presence of free neutrons between the reacting nuclei may change U (r) in such a way that the approximation (3) becomes poor. In addition, the theoretical expression for the pycnonuclear reaction rate through S(E) contains serious uncertainties [6,32] which complicate the problem. Further studies are required to clarify these points.…”

Section: Studying Uncertainties Of S(e)mentioning

confidence: 99%

“…The plasma effects were described by Salpeter and Van Horn [5] (also see [6,7,25,31,33] and references therein). They modify the interaction potential U (r) but mainly at sufficiently large r, typically larger than nuclear scales, whereas we discuss the nuclear physics effects which influence U (r) at smaller r. It is commonly thought that the plasma physics and nuclear physics effects are distinctly different and can be considered separately.…”

Section: Studying Uncertainties Of S(e)mentioning

confidence: 99%

“…However nuclear burning in dense plasma of white dwarfs and neutron stars [4], which affects the evolution and many observational manifestations of these objects, may proceed in other regimes, under strong effects of plasma screening and pycnonuclear tunneling through Coulomb barrier (e.g., Refs. [5][6][7]). The burning powers nuclear explosions in surface layers of accreting white dwarfs (nova events), in cores of massive accreting white dwarfs or in binary white dwarf mergers (type Ia supernovae) [8][9][10], and in surface layers of accreting neutron stars (type I X-ray bursts and superbursts; e.g., Refs.…”

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Large collection of astrophysicalSfactors and their compact representation

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Numerous nuclear reactions in the crust of accreting neutron stars are strongly affected by dense plasma environment. Simulations of superbursts, deep crustal heating and other nuclear burning phenomena in neutron stars require astrophysical S-factors for these reactions (as a function of center-of-mass energy E of colliding nuclei). A large database of S-factors is created for about 5,000 non-resonant fusion reactions involving stable and unstable isotopes of Be, B, C, N, O, F, Ne, Na, Mg, and Si. It extends the previous database of about 1,000 reactions involving isotopes of C, O, Ne, and Mg. The calculations are performed using the São Paulo potential and the barrier penetration formalism. All calculated S-data are parameterized by an analytic model for S(E) proposed before [Phys. Rev. C 82, 044609 (2010)] and further elaborated here. For a given reaction, the present S(E)-model contains three parameters. These parameters are easily interpolated along reactions involving isotopes of the same elements with only seven input parameters, giving an ultracompact, accurate, simple, and uniform database. The S(E) approximation can also be used to estimate theoretical uncertainties of S(E) and nuclear reaction rates in dense matter, as illustrated for the case of the 34 Ne+ 34 Ne reaction in the inner crust of an accreting neutron star.

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Section: Studying Uncertainties Of S(e)mentioning

confidence: 99%

Section: Calculationsmentioning

confidence: 99%

Section: Studying Uncertainties Of S(e)mentioning

confidence: 99%

Section: Studying Uncertainties Of S(e)mentioning

confidence: 99%

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Electron Screening Effect on Stellar Thermonuclear Fusion

Potekhin

Chabrier

2013

Contrib. Plasma Phys.

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We study the impact of plasma correlation effects on nonresonant thermonuclear reactions for various stellar objects, namely in the liquid envelopes of neutron stars, and the interiors of white dwarfs, low‐mass stars, and substellar objects. We examine in particular the effect of electron screening on the enhancement of thermonuclear reactions in dense plasmas within and beyond the linear mixing rule approximation as well as the corrections due to quantum effects at high density. In addition, we examine some recent unconventional theoretical results on stellar thermonuclear fusions and show that these scenarios do not apply to stellar conditions. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Nuclear Data and Experiments for Astrophysics

Kankainen

Goriely

2022

The Euroschool on Exotic Beams, Vol. VI

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Nuclear astrophysics aims to understand the origin of elements and the role of nuclear processes in astrophysical events. Nuclear reactions and reaction rates depend strongly on nuclear properties and on the astrophysical environment. Nuclear inputs for stellar reaction rates involve a variety of nuclear properties, theoretical models, and experimental data. Experiments providing data for nuclear astrophysics range from stable ion beam direct measurements to radioactive beam experiments employing inverse kinematics or indirect methods. Many properties relevant for astrophysical calculations, such as nuclear masses and β-decays, have also been intensively studied. This contribution shortly introduces selected astrophysical processes, discusses the related nuclear data needs, and gives examples of recent experimental and theoretical efforts in the field. Origin of Elements and Nucleosynthesis Processes The Composition of the UniverseOur knowledge of the composition of the Universe in general, and of our Solar System in particular, results almost entirely from the analysis of electromagnetic spectra originating from the various observable sources in the Universe, i.e., the

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Fusion reactions in multicomponent dense matter

Cited by 137 publications

References 53 publications

Large collection of astrophysicalSfactors and their compact representation

Large collection of astrophysicalSfactors and their compact representation

Electron Screening Effect on Stellar Thermonuclear Fusion

Nuclear Data and Experiments for Astrophysics

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