J/A+A/623/A126 Effects of a revised 7Be e--capture rate (Vescovi+, 2019)
Effects of a revised 7Be e--capture rate on solar neutrino fluxes.
Vescovi D., Piersanti L., Cristallo S., Busso M., Vissani F., Palmerini S.,
Simonucci S., Taioli S.
<Astron. Astrophys. 623, A126 (2019)>
=2019A&A...623A.126V 2019A&A...623A.126V (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Sun
Keywords: neutrinos - nuclear reactions, nucleosynthesis, abundances -
Sun: abundances - Sun: helioseismology - Sun: interior
Abstract:
The electron-capture rate on 7Be is the main production channel for
7Li in several astrophysical environments. Theoretical evaluations
have to account for not only the nuclear interaction, but also the
processes in the plasma where 7Be ions and electrons interact. In
the past decades several estimates were presented, pointing out that
the theoretical uncertainty in the rate is in general of few percents.
In the framework of fundamental solar physics, we consider here a
recent evaluation for the 7Be+e- rate, not used up to now in the
estimate of neutrino fluxes. We analysed the effects of the new
assumptions on Standard Solar Models (SSMs) and compared the results
obtained by adopting the revised 7Be+e- rate to those obtained
by the one reported in a widely used compilation of reaction rates
(ADE11). We found that new SSMs yield a maximum difference in the
efficiency of the 7Be channel of about -4% with respect to what is
obtained with the previously adopted rate. This fact affects the
production of neutrinos from 8B, increasing the relative flux up to
a maximum of 2.7%. Negligible variations are found for the physical
and chemical properties of the computed solar models. The agreement
with the SNO measurements of the neutral current component of the 8B
neutrino flux is improved
Description:
Here we give, in a tabulated form, the electron-capture rate on $^7$Be
computed by Simonucci et al. (2013ApJ...764..118S 2013ApJ...764..118S), as a function of
rho/mue and T, in logarithmic scale.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rate7be.dat 16 3672 Revised electron-capture rate on 7Be from
Simonucci et al. (2013ApJ...764..118S 2013ApJ...764..118S)
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Byte-by-byte Description of file: rate7be.dat
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Bytes Format Units Label Explanations
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1- 4 F4.1 [-] log(rho/mue) Log(density/electrons' mean molecular weight)
6- 8 F3.1 [K] log(T) Logarithimic value of the temperature
10- 16 F7.3 [s-1] log(r) Logarithimic value of the e-capture rate
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Acknowledgements:
Diego Vescovi, diego.vescovi(at)gssi.it
(End) D. Vescovi [Gran Sasso Science Inst.], P. Vannier [CDS] 06-Feb-2019