Lifetimes of low-spin excited states in Zr98 were measured using the recoil-distance Doppler-shift technique and the Doppler-shift attenuation method. The nucleus of interest was populated in a Zr96(O18,O16)Zr98 two-neutron transfer reaction at the Cologne FN Tandem accelerator. Lifetimes of six low-spin excited states, of which four are unknown, were measured. The deduced B(E2) values were compared with Monte Carlo shell model and interacting boson model with configuration mixing calculations. Both approaches reproduce well most of the data but leave challenging questions regarding the structure of some low-lying states.
Bibliographical noteFunding Information:
A.E. and V.K. acknowledge financial support from the BMBF under Grant No. 05P19PKFNA. J.-M.R. and L.K. acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG) under Grant No. JO391/16-2. We thank J. E. García-Ramos for providing the ) values from the calculation in Ref. . We also thank T. Otsuka for providing the values from the calculation in Ref. . The work of A.L. and N.G. was supported by the US-Israel Binational Science Foundation Grant No. 2016032 and, in part, by the Israel Science Foundation Grant No. 586/16.
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