Spectra of double-cumulative photons in the central rapidity region at high transverse momenta

The spectra of photons produced in the interaction between carbon ions of kinetic energy 2.0 and 3.2 GeV per nucleon and beryllium nuclei were measured at the FLINT facility by means of electromagnetic calorimeters that is deployed at the accelerator of the Institute for Theoretical and Experimental Physics (ITEP, Moscow). The spectra in question were measured in the central rapidity region (at angles between 35° and 73° in the laboratory frame) at photon energies of 1 to 3 GeV by using a cumulative-photon trigger. An analysis of the data obtained in this way reveals that the interaction of multinucleon fluctuation in the projectile nucleus with a multinucleon fluctuation in the target nucleus is a dominant process that leads to photon production in the measured region of angles and momenta. As a development of the generally accepted terminology, an interaction of this type may be called a double cumulative interaction.