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[en] We report preliminary results from ultra-fast time-delayed γγ(t) measurements on exotic nuclei just below 100Sn. The measurements were performed at the LISE spectrometer in GANIL. Nuclei of 94Ru and 96Pd were populated in the isomeric states via the fragmentation of energetic 112Cd beam. Preliminary lifetime or lifetime limits are reported for the 6+, 4+, and 2+ states in 96Pd and the 4+ and 2+ states in 94Ru. These results indicate an unexpected and strong quenching of the B(E2) strength for the 4+ to 2+ E2 transition in 96Pd in comparison with model predictions and the equivalent B(E2) strength in 94Ru. The sequence of quenched B(E2) rates for the 8+ → 6+ E2 transition in 94Ru, 4+ → 2+E2 transition in 96Pd and for the 8+ → 6+ E2 transition in 98Cd, seems to represent a systematic pattern along the N=50 neutron number just below Z=50 and could imply a weak N=50 shell closure when approaching the doubly magic 100Sn. (author)
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Suzuki, Yasuyuki; Ohya, Susumu; Matsuo, Masayuki; Ohtsubo, Takashi (Niigata Univ., Niigata (Japan)) (eds.); 397 p; ISBN 981-256-054-8; 
; 2004; p. 277-283; NENS03: International symposium on a new era of nuclear structure physics; Kurokawa, Niigata (Japan); 19-22 Nov 2003; 13 refs., 6 figs., 1 tab.
; 2004; p. 277-283; NENS03: International symposium on a new era of nuclear structure physics; Kurokawa, Niigata (Japan); 19-22 Nov 2003; 13 refs., 6 figs., 1 tab.