Mesures des vies moyennes des niveaux de 1K alimentes par les réactions 39K(t,p) et 27Al(16O, 2p)

Twenty-four levels in ⁴¹K at excitation energies below 5 MeV have been identified in the reactions ³⁹K(t, p)⁴¹K and ²⁷Al(¹⁶O, 2p)⁴¹K, at incident beam energies of 3.0 and 34 MeV respectively. Using the recoil-distance technique and the Doppler-shift attenuation method, mean lifetimes (in ps) were obtained for the following levels: 980 keV, 0.42^0.30_0.15; 1294 keV, > 5; 1560 keV, 0.58 ± 0.22; 1582 keV,> 1.5; 1677 keV, 6⁺³_?1; 1698 keV, 1.3 ± 0.4; 2528 keV, 230 ± 15; 2762 keV, < 2; 2775 keV, 68 ± 4; 4274 keV, < 2; 4983 keV, 95 ± 15. The positive parity states are suggested to have predominantly 2p-1h configurations. As a by-product, mean lifetimes for five levels in ⁴¹Ca, populated via the ²⁷Al(¹⁶O, pn)⁴¹Ca reaction, were also obtained.