Two photons correlated production at the 25MWTh reactor

We have performed an extensive search for correlated production of two or more photons at the 25MWTh reactor at Swierk/Poland/. We were looking for a prompt signal originating from decays of axions. Our experimental set-up consisted of an arry of nine 3`×3` NaI/Tl/detectors, surrounded by active/plastic scintillators/ and passive shieldings, thus ncreasing experimental sensitivity as compared to other experiments in which two detectors were used. Data were collected during 26 weeks, with four days of reactor ``ON'', and three days of reactor ``OFF'' each week. Preliminary results are presented.