Abstract
The mean lives of levels in 37K and 39K have been measured with the Doppler-shift attenuation method through the 36Ar(p,γ)37K and 38Ar(p,γ)39K reaction. The ions 36Ar (0.337%) and 38Ar (0.063%) were separated into a tantalum backing. The mean lives or their upper limits of the 2 523 keV, 3 020 keV and 7 738 keV states in 39K and of the 2 750 keV state in 37K were determined as τm = 32 ± 12 fs, 21 ± 6 fs, < 4 fs and < 6 fs, respectively. The result obtained for the Q-value of the 38Ar(p,γ)39K reaction was 6 381.2 ± 1.2 keV. Some information concerning the decay of the 38Ar(p,γ)39K Ep = 1 393 keV resonance is also gained. The results on τ are compared with predictions from previous shell-model calculations.
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