Lifetime and branching measurements on the Kπ = 0+ and Kπ = 2+24Mg rotational levels

Abstract The 24 Mg ground state K π = 0 + rotattonal band and the K π = 2 + band built on the 4.24 MeV 2 + level have been studied using the 12 C( 16 O, α) 24 Mg reaction. The results of lifetime measurements, made using the Doppler shift attenuation method, and γ-branching ratio determinations are reported. These give an unambiguous assignment of J π = 6 + to the 8.11 and 9.53 MeV levels. The results for the 13.21 MeV (8 + , 6 + ) level and a new level at 12.35 MeV support assignments of J π , K = 8 + , 0 and (7 + , 2) to these levels, respectively. All the intraband itE2 transition strengths are in reasonable agreement with both the rotational model and recent shell model calculations although the interband E2 strengths are in poor agreement. No evidence for band mixing was observed and an upper limit of 2.5% is given for the fractional amplitude of the 2 + , 0 state mixed into the 2 + , 2 state.