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From the 12C(π+, K+)12ΛC rection, the γ-rays of 261.6 ± 0.24 keV (7/2+ → 5/2+) and 1481.7 ± 0.7 keV (1/2+ →5/2+) of 11Λ1 B, and 2667.3 ± 2.8 keV (1-2 → 2-1) of 12Λ C hypeuclei have been identified using a large germanium detector array Hyperball2 at K6 beam line of KEK. The observed energies of the transitions 1481.7keV and 261.6keV are significantly different from the values predicted by the shell model using the △ and SN parameters determined from the 7ΛLi data.