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We have studied the reaction p + 27 Al → 3 He + p + π − + X at recoil-free kinematics. An η meson possibly produced in this reaction would be thus almost at rest in the laboratory system and could therefore be bound with high probability, if nuclear η states exist. The decay of such a state through the N * (1535) resonance would lead to a proton-π − pair emitted in opposite directions.For these conditions we find some indication of such a bound state. An upper limit of ≈ 0.5 nb is found.

Complete fusion cross sections have been measured using the off-line γ -ray spectroscopy method for the 6 Li + 90 Zr system around barrier energies. Statistical and coupled-channel calculations have been performed to investigate the effect of coupling on complete fusion. It is observed that the complete fusion is suppressed by 34 ± 8% compared to the coupled channel predictions. The effect of breakup coupling is estimated using the continuum discretized coupled channels (CDCC) method and it is found to reduce the complete fusion probability. Contrary to earlier predictions, a universal behavior of complete fusion suppression factor for the 6 Li projectile with target charge is observed.

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