The Relevance of Nuclear Reactions for Standard Solar Models Construction

Villante, F. L.; Serenelli, Aldo

doi:10.3389/fspas.2020.618356

Cited by 17 publications

(21 citation statements)

References 90 publications

(137 reference statements)

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“…The value of the exponent, α = 0.716, is specific to BX (CN). Analogous relations can be easily obtained (70,71) for future detectors simply by determining ξ and α according to the differential sensitivity of the detector to ( 13 N) and ( 15 O). If future experiments allow separate measurements of ( 13 N) and ( 15 O), the difference ( 13 N) − ( 15 O) can be used to determine the C abundance independently of N, which can then also be determined.…”

Section: Solar Neutrino Fluxesmentioning

confidence: 98%

“…The external peak in its distribution is produced by the production of N from primordial C in the Sun. It is therefore proportional to the C abundance and is largely independent of environmental factors and uncertainty in the 12 C(p, γ ) 13 N reaction (71). The second, inner peak comes from the CN cycle operating in steady state, which depends not only on the total abundance of C+N but also on the temperature of the solar core-that is, it is affected by environmental factors.…”

Section: Solar Neutrino Fluxesmentioning

confidence: 99%

“…The energy threshold of the chlorine reaction used in the Homestake experiment meant that it was not sensitive to pp neutrinos, which sit very low in the spectrum (Figure 1). Access to these pp neutrinos was achieved using similar radiochemical techniques in the reaction 71 Ga → 71 Ge, which benefits from a Q-value of only 233 keV. These measurements, which were performed by the GALLEX Collaboration (7)(8)(9) and later the GNO Collaboration (10) in the Italian Laboratori Nazionali del Gran Sasso (LNGS) and by the SAGE Collaboration (11,12) in the Russian Baksan Neutrino Observatory, all showed deficits in the observed solar neutrino flux.…”

Section: Introduction and Historical Overviewmentioning

confidence: 99%

See 2 more Smart Citations

The Future of Solar Neutrinos

Gann

Zuber

Bemmerer

et al. 2021

Annu. Rev. Nucl. Part. Sci.

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In this article we review the current state of the field of solar neutrinos, including flavor oscillations, nonstandard effects, solar models, cross section measurements, and the broad experimental program thus motivated and enabled. We describe the historical discoveries that contributed to current knowledge, and define critical open questions to be addressed in the next decade. We discuss standard solar models, including uncertainties and problems related to the solar composition, and review experimental and model solar neutrino fluxes, including future prospects. We review the state of the art of the nuclear reaction data relevant for solar fusion in the proton–proton chain and carbon–nitrogen–oxygen cycle. Finally, we review the current and future experimental programs that can address outstanding questions in this field. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Solar Neutrino Fluxesmentioning

confidence: 98%

Section: Solar Neutrino Fluxesmentioning

confidence: 99%

Section: Introduction and Historical Overviewmentioning

confidence: 99%

See 1 more Smart Citation

The Future of Solar Neutrinos

Gann

Zuber

Bemmerer

et al. 2021

Annu. Rev. Nucl. Part. Sci.

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“…It is not the purpose of this work to explore the uncertainties affecting each of the reactions in the pp chains and CNO cycle. a recent investigation of the dependence of neutrino fluxes predicted by models on abundances, central temperatures and S-factors is presented in Villante & Serenelli (2021). Their work is based on linear pertubations of standard solar models and allows for the consideration of dependences on an extended number of nuclear reactions.…”

Section: Parametric Increase In Pp Reaction Ratesmentioning

confidence: 99%

Standard solar models: Perspectives from updated solar neutrino fluxes and gravity-mode period spacing

Salmon

Buldgen²,

Noels³

et al. 2021

A&A

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Context. Thanks to the vast and exquisite set of observations that have been made available for the Sun, our star is by far an ideal target for testing stellar models with a unique precision. A recent issue under consideration in the field is related to the progress in the solar surface abundances derivation that has led to a decrease of the solar metallicity. While the former high-metallicity models were in fair agreement with other observational indicators from helioseismology and solar neutrino fluxes, it is no longer the case for low-metallicity models. This issue has become known as 'the solar problem'. Recent data are, however, promising to shed a new light on it. For instance, in 2020, the Borexino collaboration released the first-ever complete estimate of neutrinos emitted in the CNO cycle, which has reaffirmed the role of the neutrino constraints in the solar modelling process and their potential in exploring related issues. In parallel, a newly claimed detection of solar gravity modes of oscillation offers another opportunity for probing the stratification in the Sun's central layers.Aims. We propose combining the diagnoses from neutrinos and helioseismology, both from pressure and gravity modes, in assessing the predictions of solar models. We compare in detail the different physical prescriptions currently at our disposal with regard to stellar model computations. Methods. We built a series of solar standard models based on a variation of the different physical ingredients directly affecting the core structure: opacity, chemical mixture, nuclear reactions rates. We compare the predictions of these models to their observational counterparts for the neutrinos fluxes, gravity-mode period spacing, and low-degree pressure mode frequency ratios. Results. The CNO neutrino flux confirms previous findings, exhibiting a preference for high-metallicity models. Nevertheless, we found that mild modification of the nuclear screening factors can re-match low-metallicity model predictions to observed fluxes, although it does not restore the agreement with the helioseismic frequency ratios. Neither the high-metallicity or low-metallicity models are able to reproduce the gravity-mode period spacing. The disagreement is huge, more than 100σ to the observed value. Reversely, the family of standard models narrows the expected range of the Sun's period spacing: between ∼2150 to ∼2190 s. Moreover, we show this indicator can constrain the chemical mixture, opacity, and -to a lower extent -nuclear reactions in solar models.

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“…It is not the purpose of this work to explore the uncertainties affecting each of the reactions in the pp chains and CNO cycle. The interested reader will find in Villante & Serenelli (2021) a recent investigation of the dependence of neutrino fluxes predicted by models on abundances, central temperatures and Sfactors. Their work is based on linear pertubations of standard solar models and allows for considering dependences on an extended number of nuclear reactions.…”

Section: Parametric Increase Of Pp Reaction Ratesmentioning

confidence: 99%

Standard solar models: a perspective from updated solar neutrino fluxes and the gravity-mode period spacing

Salmon,

Buldgen,

Noels

et al. 2021

Preprint

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Context. Thanks to the large and exquisite set of observations we have for the Sun, our star is by far a privileged target for testing stellar models with unique precision. A recent concern appeared with the progress in the solar surface abundances derivation that has led to a decrease of the solar metallicity. While the ancient high-metallicity models were in fair agreement with other observational indicators from helioseismology and solar neutrino fluxes, it is no longer the case for low-metallicity models. This issue is known as the solar problem. Recent collection of data are however promising to shed a new light on it. For instance, the Borexino collaboration released in 2020 the first-ever complete estimate of neutrinos emitted in the CNO cycle. It has reaffirmed the role of the neutrino constraints in the solar modelling process and their potential to explore the associated issues. In parallel, newly claimed detection of solar gravity modes of oscillations offers another opportunity of probing the stratification in the Sun's central layers. Aims. We propose to combine the diagnoses from neutrinos and helioseismology, both from pressure and gravity modes, for assessing the predictions of solar models. We compare in detail the different physical prescriptions currently at disposal for stellar model computations.Methods. We build a series of solar standard models by varying the different physical ingredients affecting directly the core structure; opacity, chemical mixture, nuclear reactions rates. We compare the predictions of these models to their observational counterpart for the neutrinos fluxes, gravity-mode period spacing and low-degree pressure mode frequency ratios. Results. The CNO neutrino flux confirms previous findings, showing a preference for high-metallicity models. Nevertheless, we found that mild modification of the nuclear screening factors can re-match low-metallicity model predictions to observed fluxes, although it does not restore the agreement with the helioseismic frequency ratios. Neither the high-metallicity or low-metallicity models are able to reproduce the gravity-mode period spacing. The disagreement is huge, more than 100σ to the observed value. Reversely, the family of standard models narrows the expected range of the Sun's period spacing: between ∼2150 to ∼2190 s. Moreover, we show this indicator can constrain the chemical mixture, opacity, and to a lower extent nuclear reactions in solar models.

show abstract

The Relevance of Nuclear Reactions for Standard Solar Models Construction

Cited by 17 publications

References 90 publications

The Future of Solar Neutrinos

The Future of Solar Neutrinos

Standard solar models: Perspectives from updated solar neutrino fluxes and gravity-mode period spacing

Standard solar models: a perspective from updated solar neutrino fluxes and the gravity-mode period spacing

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