Hello everyone, If a nucleus consisting solely of mesons has enough mesons in it, will it be stable? Mesons are bosons, therefore (unlike baryons) they aren't effected by the pauli exclusion principle, so they all can acquire the lowest energy state. In theory, if there are enough mesons, the mass defect becomes so high, that it is more favourable for the nucleus to not decay, and be stable (assumed the mesons are uncharged, don't decay via electromagnetic force and aren't their exact antiparticles) The appropriate meson selection would be the neutral kaon, as it decays via the weak force. So, if a nucleus has (only) enough neutral kaons in it, will it be stable? Note: the problem with the neutral kaons is that they oscillate into antikaons, which are their antiparticles, and their existence would make the system collapse.