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Two dedicated experiments on internal pair conversion (IPC) of isoscalar M1 transitions were carried out in order to test a 9 MeV/c 2 X-boson scenario. In the 7 Li(p, e + e − ) 8 Be reaction at 1.1 MeV proton energy to the predominantly T=0 level at 18.15 MeV, a significant deviation from IPC was observed at large pair correlation angles. In the 11 B(d, ne + e − ) 12 C reaction at 1.6 MeV, leading to the 12.71 MeV 1 + level with pure T=0 character, an anomaly was observed at 9 MeV/c 2 . The compatibility of the results with the scenario is discussed.