Glueball candidates seen in the reactions p̄ 20Ne and p̄ 4He at 607 MeV/c

Two narrow peaks at about 1500 and 1800 MeV/c2 are seen in the distributions of invariant mass of the assumed six-pion systems in the final states of Ne and He reactions at 607 MeV/c. In He-reactions the peaks are seen only in the forward direction, while in Ne-reactions they are also seen in the backward direction with momenta near the momentum of the incident antiproton. The peaks could possibly be due to glueballs.