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The experimental efforts characterizing the era of precision neutrino physicsrevolve around collecting high-statistics neutrino samples and attaining anexcellent energy and position resolution. Next generation liquid-based neutrinodetectors, such as JUNO, HyperKamiokande, etc, share the use of a large targetmass, and the need of pushing light collection to the edge for maximalcalorimetric information. Achieving high light collection implies considerablecosts, especially when considering detector masses of several kt. A traditionalstrategy to maximize the effective photo-coverage with the minimum number ofPMTs relies on Light Concentrators (LC), such as Winston Cones. In this paper,the authors introduce a novel concept called Occulting Light Concentrators(OLC), whereby a traditional LC gets tailored to a conventional PMT, by takinginto account its single-photoelectron collection efficiency profile and thusocculting the worst performing portion of the photocathode. Thus, the OLC shapeoptimization takes into account not only the optical interface of the PMT, butalso the maximization of the PMT detection performances. The light collectionuniformity across the detector is another advantage of the OLC system. Byconsidering the case of JUNO, we will show OLC capabilities in terms of lightcollection and energy resolution.

Occulting Light Concentrators in Liquid Scintillator Neutrino Detectors