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Angular distributions of the ␣-particle production differential cross section from the breakup of 6 Li and 7 Li projectiles incident on a 208 Pb target have been measured at seven projectile energies between 29 and 52 MeV. The ␣-breakup cross section of 6 Li was found to be systematically greater than that of 7 Li across the entire energy range. These data have been compared with previously reported results and with the predictions of continuum-discretized coupled channels ͑CDCC͒ calculations including resonant and nonresonant projectile breakup. The present data compare well with previous measurements, while the CDCC calculations provide a reasonable prediction of the relative ␣-breakup cross sections but underpredict their absolute values. The calculations confirm that a major factor in the enhancement of the 6 Li to 7 Li ␣-breakup cross section is the difference between the ␣-breakup thresholds of the two isotopes. These results have implications for structural studies of light exotic nuclei based on elastic scattering.

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