Radiation from matter-antimatter annihilation in the quark nugget model of dark matter

We revisit the properties of positron cloud in quark nugget (QN) model dark matter (DM). In this model, particles are represented by compact composite objects composed a large number quarks or antiquarks with total baryon $B\sim 10^{24}$. These have very small density our galaxy which makes them "dark" to all DM detection experiments and cosmological observations. scenario, anti-quark nuggets play special role because they may manifest themselves annihilation visible matter. study electron-positron collisions free electrons, hydrogen helium gases nuggets. show that strong electric field destroys positronium, atoms prevents electrons from penetrating deeply cloud, thus reducing probability nearly five orders magnitude. Therefore, electron QNs cannot explain observed SPI/INTEGRAL detector photons energy 511 keV center galaxy. be explained different mechanism QN captures protons annihilate anti-quarks core transform neutrons charge increasing temperature. As result loses positrons space there. Even more produced charged pions resulting proton annihilation. Another manifestation emission $\pi^0$ decays.