Abstract
Lifetime measurement of the first excited 2+ state in 18 C was performed using an upgraded recoil shadow method to determine the electric quadrupole transition. The measured mean lifetime is 18.9 ± 0.9 (stat) ± 4.4 (syst) ps, which corresponds to a [Formula: see text] value of 4.3 ± 0.2 ± 1.0 e2 fm 4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in 16 C was remeasured to be about 18 ps, about four times shorter than the value reported previously. By incorporating the γ-ray angular distribution measured in this work into the previous measurement, this discrepancy has been explained. The observed transition strengths in 16,18 C are hindered compared to the empirical transition strengths, indicating that the anomalous hindered E2 strength observed in 16 C persists in 18 C .
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