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We look for fluctuations expected for the QCD critical point using anintermittency analysis in the transverse momentum phase space of protonsproduced around midrapidity in the 12.5\% most central C+C, Si+Si and Pb+Pbcollisions at the maximum SPS energy of 158$A$~GeV. We find evidence ofpower-law fluctuations for the Si+Si data. The fitted power-law exponent$\phi_{2} = 0.96^{+0.38}_{-0.25}\text{ (stat.)}$ $\pm 0.16\text{ (syst.)}$ isconsistent with the va\-lue expected for critical fluctuations. Power-lawfluctuations had previously also been observed in low-mass $\pi^+ \pi^-$ pairsin the same Si+Si collisions.

Critical fluctuations of the proton density in A+A collisions at $158A$ GeV