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We designed and constructed a cryogenic photoelectron yield spectroscopy having high resolution ( 10 meV) and wide dynamic range ( 10 7 ). The yield spectra taken for Bi 2 Sr 2 CaCuO y (BSCCO)single crystals at 10 K showed a dip structure in the vicinity of the Fermi level. The measured data could be well fitted with a curve simulated from the BCS function with a gap value of 20 meV.