Experimental search of bursts of very high energy gamma rays from primordial black holes

International Center for Astronomical, Medical and Ecological Research,National Academy of Sciences of UkraineAbstract. The technical procedure of a searchof bursts of very high energy gamma rays fromevaporation of primordial black holes on air-showerarray ”Andyrchy” of Baksan Neutrino Observatoryof Institute for Nuclear Research is described. Thetheoretical model used in the present work assumesthat the chromosphere around the evaporating blackhole does not form. For minimization of the cosmicray background the method of multidimensionalanalysis of modelled as well as experimentally de-tected events is applied. The new upper limit onthe concentration of evaporating primordial blackholes in the local region of Galaxy is obtained. Thecomparison of the results of different experiments isgiven.Keywords: primordial black holes, gamma rays,extensive air showersI. I