Electromagnetic transition strengths between high spin states in sup 79 Sr and sup 80 Sr

High spin states in {sup 79}Sr were populated via the reaction {sup 58}Ni({sup 24}Mg,2{ital pn}) at 80 and 85 MeV beam energy. Twelve lifetimes in the range from 0.5 to 150 ps and four lifetime limits were measured with Doppler-shift methods. By comparing lifetimes in {sup 79,80,82}Sr obtained with the recoil distance and Doppler-shift attenuation methods, the appropriate electronic stopping power of Sr ions recoiling in Ta was determined. In addition, lifetimes of yrast states in {sup 80}Sr and {sup 79}Rb were determined in the concurrent reactions {sup 58}Ni({sup 24}Mg,2{ital p}) and {sup 58}Ni({sup 24}Mg,3{ital p}). The {Delta}{ital I}=2 {ital E}2 transition strengths and the {ital E}2/{ital M}1 mixing ratios of the {Delta}{ital I}=1 transitions in {sup 79}Sr confirm the picture of extremely prolate deformed rotational bands ({beta}{sub 2}{approx}0.42), based on the (301)(3/2{sup {minus}} and (422))5/2{sup +} Nilsson orbits. A reduction in {ital B}({ital E}2) values is observed at the onset of (3{ital qp}) alignment. The band structure of {sup 79}Sr is discussed in terms of the cranked shell and the Woods-Saxon cranking model with pairing.