Lifetime of the 2755 keV 15/2? state in43Ca

Using the recoil distance Doppler shift method, we measured the lifetime of the 2755 keV 15/2^? state in⁴³Ca populated in the reaction²⁸Si(¹⁸0,2p n) to beΤ=39 ±5 ps. We also remeasured the lifetime of the 2751 keV 4⁺ state in⁴²Ca excited in the reaction²⁸Si(¹⁶O,2p) to beΤ=3.8±0.4ps. Effective charges derived fromE2 transition between (f _7/2)^v high-spin states are discussed.