Confirmation/Observation of Hindered E2 Strengths in 16,18C
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Graphical Abstract
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Abstract
The lifetime of the first excited 2+ state in 18C was measured 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 B(E2; 2+1→0+gs) value of (4.3± 0.2 ±1.0) e2fm4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in 16C was remeasured to be about 18 ps, about four times shorter than the value reported previously. This discrepancy was explained by incorporating the γray angular distribution measured in this work into the previous measurement. The observed transition strengths in 16,18C are hindered compared to the empirical transition strengths, indicating that the anomalous hindrance observed in 16C persists in 18C.
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