{"knowledge_schema": {"broad_category": "Physics \u2192 Astrophysics \u2192 Solar Neutrinos", "refinement": "This problem specifically examines the production of neutrinos in the Sun and how changes in nuclear reactions affect neutrino flux at different energy bands.", "specific_scope": "The focus is on the pp-III branch of the solar fusion process and its contribution to neutrino production, particularly in the energy ranges of 700-800 keV and 800-900 keV.", "goal": "Determine the ratio of neutrino fluxes between two specified energy bands after the hypothetical cessation of the pp-III branch."}, "summary": "This problem involves understanding the production of solar neutrinos and how the cessation of a specific fusion process (pp-III) affects the flux of neutrinos in different energy bands. The task is to calculate the ratio of neutrino fluxes between the 700-800 keV and 800-900 keV energy bands, given that the pp-III branch has stopped. The answer indicates that the flux in the lower energy band is significantly less than that in the higher energy band, resulting in a ratio of 0.01 (10^-2)."}