Study of the double beta decay of 70 < A < 100 nuclei within the RQRPA and the self-consistent BCS + RQRPA formalisms

The yield of direct photons in Pb+Pb collisions at SpS and LHC energies is evaluated with emphasis on estimates of possible uncertainties. The possibility of experimental observation of direct photons at LHC is discussed. Predictions of several models at SpS energy are compared.