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Lifetime measurements of the low-lying excited states of 208Po

D. Kocheva,A. Yaneva,D. Kalaydjieva,G. Rainovski,J. Jolie,N. Pietralla,M. Beckers,A. Blazhev,L. Bussmann,M. Cappellazzo,A. Dewald,F. Diel,M. Djongolov,F. Dunkel,A. Esmaylzadeh, B. Falk,C. Fransen,J. Garbe,L. Gerhard,R.-B. Gerst,K. A. Gladnishki,A. Goldkuhle,G. Hackenberg,C. Henrich,I. Homm,K. Ide,V. Karayonchev,R. Kern, J. Kleeman,L. Knafla,L. Kornwebel,Th. Kröll,M. Ley,C. Müller-Gatermann,M. Scheck,T. Schmidt,P. Spagnoletti,M. Stoyanova,V. Werner

Journal of Physics: Conference Series（2020）

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Abstract
Abstract In this study we present the preliminary results about the lifetimes of the 2 2 + , 4 1 + states of 208Po and the upper limit of the lifetime of the 2 1 + state. For measuring the lifetimes of the 2 1 + and 4 1 + states the Recoil Distance Doppler Shift (RDDS) method and for the lifetime of the 2 2 + state the Doppler Shift Attenuation method (DSAM) were used. The resulting absolute transition strength B ( M 1 ; 2 2 + → 2 1 + ) ≥ 0.122 ( 20 ) μ N 2 reveals the predominant isovector nature of the 2 2 + state of 208Po.
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Key words
excited states,lifetime,low-lying
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