The 34,35 Al ␤ decays have been studied at the CERN online mass separator ISOLDE by ␤-␥, ␤-␥-␥, and ␤-n-␥ measurements in order to corroborate the low-level description of 34 Si and to obtain the first information on the level structure of the Nϭ21 isotope 35 Si. Earlier observed ␥ lines in 34 Al decay were confirmed and new ␥ transitions following both ␤ decay and ␤-delayed neutron emission have been established. The first level scheme of 35 Si includes three excited states at 910, 974, and 2168 keV. Indication is found for J ϭ(3/2) Ϫ and (3/2) ϩ for the first two excited states, respectively. Beta-decay half-life of T 1/2 ϭ38.6(4) ms and ␤-delayed neutron branching value P n ϭ41(13)% were measured unambiguously. The significance of the single-particle energy determination at Nϭ21, Zϭ14 for assessing the effective interaction in sd-f p shellmodel calculations is discussed and illustrated by predictions for different neutron-rich isotopes.

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