Energy spectrum of UHECRs measured by newly constructed fluorescence detectors in Telescope Array experiment

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Telescope Array (TA) experiment is the largest hybrid detector to observe ultra-high energy cosmic rays (UHECRs) in the northern hemisphere. In the TA experiment, we newly designed and constructed 24 fluorescence detectors (FDs) located at two stations. We report the energy spectrum of UHECRs with energies above 10 17.5 eV from analyzing data collected by the new FDs during the first 3.7 years in monocular mode.