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DANSS is a one cubic meter plastic scintillator detector with a primary goalof the sterile neutrino searches at a commercial nuclear reactor. Due to itshighly advantageous location, fine segmentation and ability to change thedistance to the neutrino production origin DANSS is ahead of many similarexperiments around the world in terms of the counting rate, signal tobackground ratio and sterile neutrino exclusion regions. Yet a moderate energyresolution of the detector prevents the further progress in the physicsprogram. The main challenge of the planned upgrade is to achieve the energyresolution of 12% at 1 MeV. The new design of the main sensitive element - theplastic scintillation strip - is the most important step forward. The stripprototypes were manufactured and tested at the pion beam of the PNPIsynchrocyclotron. More than twice higher light output together with fairly flatdetector response uniformity, longitudinal timing information and otheroptimizations will surely help to reach the upgrade goal. The paper discussesthe drawbacks of the current strip version, outlines the new features of theproposed upgrade, describes the beam test procedure and presents the testresults reflecting the advantages of the new strip design in comparison withthe currently used version.

Optimized scintillation strip design for the DANSS upgrade