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.

Intruder features in the island of inversion : The 33Mg case. Physical Review C, 64(5), Article 054313.

␤ decays of on-line mass-separated neutron-rich 118 Ag and 120 Ag isotopes have been studied by using ␤-␥ and ␥-␥ coincidence spectroscopy. Extended decay schemes to the 118,120 Cd daughter nuclei have been constructed. The three-phonon quintuplet in 118 Cd is completed by including a new level at 2023.0 keV, which is tentatively assigned the spin and parity of 2 4 ϩ . The intruder band in 118 Cd is proposed up to the 4 ϩ level at 2322.4 keV. The measured ␤-decay half-life for the high-spin isomer of 120 Ag is 0.40Ϯ0.03 s. Candidates for the three-phonon states, as well as the lowest members of the intruder band in 120 Cd, are also presented. These data support the coexistence of quadrupole anharmonic vibration and proton particle-hole intruder excitations in 118,120 Cd.