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Abstract: We argue that it may be possible to exploit neutrinos from the CN cycle andpp chain to determine the primordial solar core abundances of C and N at aninteresting level of precision. Such a measurement would allow a comparison ofthe Sun-s deep interior composition with it surface, testing a key assumptionof the standard solar model SSM, a homogeneous zero-age Sun. It would alsoprovide a cross-check on recent photospheric abundance determinations that havealtered the once excellent agreement between the SSM and helioseismology. Asfurther motivation, we discuss a speculative possibility in which photosphericabundance-helioseismology puzzle is connected with the solar-system metaldifferentiation that accompanied formation of the gaseous giant planets.The theoretical relationship between core C and N and the 13N and 15O solarneutrino fluxes can be made more precise and more general by making use ofthe Super-Kamiokande and SNO 8B neutrino capture rates, which calibrate thetemperature of the solar core. The primordial C and N abundances can then beobtained from these neutrino fluxes and from a product of nuclear rates, withlittle residual solar model dependence. We describe some of the recentexperimental advances that could allow this comparison to be madetheoretically at about the 9% level, and note that this uncertainty may bereduced further due to ongoing work on the S-factor for 14Np,gamma. Theenvisioned measurement might be possible in deep, large-volume detectors usingorganic scintillator, e.g., Borexino or SNO+



Autor: W. C. Haxton, A. M. Serenelli

Fuente: https://arxiv.org/







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