Coulomb excitation and lifetime measurements of the 21+ states in 76, 82, 84Kr

Abstract A mean lifetime of τ = 35 ± 3 ps of the 2 + 1 state in 76 Kr has been measured with the recoil distance method via the reaction 63 Cu( 19 F, α2n) 76 Kr. The B (E2; 0 + 1 → 2 + 1 ) values and lifetimes of the 2 + 1 states in 82, 84 Kr have been measured via Coulomb excitation using the 1.4 MeV/A UNILAC krypton beams. The intensities of the γ-rays from the Coulomb excited levels of 82, 84 Kr were interrelated with those of the target nuclei 27 Al, 64, 66 Zn and 70, 72, 74, 76 Ge and yielded the values B( E 2; 0 + 1 → 2 + 1 = 0.255±0.009 and 0.122 ± 0.005 e 2 · b 2 for 82, 84 Kr , respectively. In turn, these B ( E 2) values and the (E2; 0 + 1 → 2 + 1 values of the even Ge and Zn isotopes from the literature were used in a Doppler-shift attenuation analysis to obtain experimentally lacking electronic stopping power for Kr ions slowing down in Al, Zn and Ge. for Ge ions in Ge and for Zn ions in Zn.