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The Jiangmen Underground Neutrino Observatory (JUNO) project aims at probing,at the same time, the two main frequencies of three-flavor neutrinooscillations, as well as their interference related to the mass ordering(normal or inverted), at a distance of ~53 km from two powerful reactorcomplexes in China, at Yangjiang and Taishan. In the latter complex, theunoscillated spectrum from one reactor core is planned to be closely monitoredby the Taishan Antineutrino Observatory (TAO), expected to have betterresolution (x 1/2) and higher statistics (x 30) than JUNO. In the context ofneutrino energy spectra endowed with fine-structure features from summationcalculations, we analyze in detail the effects of energy resolution and nucleonrecoil on observable event spectra. We show that a model spectrum in TAO can bemapped into a corresponding spectrum in JUNO through appropriate convolutions.The mapping is exact in the hypothetical case without oscillations, and holdsto a very good accuracy in the real case with oscillations. We then analyze thesensitivity to mass ordering of JUNO (and its precision oscillometrycapabilities) assuming a single reference spectrum, as well as bundles ofvariant spectra, as obtained by changing nuclear input uncertainties insummation calculations from a publicly available toolkit. We show through achi-squared analysis that variant spectra induce little reduction of thesensitivity in JUNO, especially when TAO constraints are included. Subtleaspects of the statistical analysis of variant spectra are also discussed.

Mapping reactor neutrino spectra from TAO to JUNO