Abstract
Excited states in have been populated via the fusion-evaporation reaction at a beam energy of 32 MeV. The Cologne plunger device surrounded by a -ray detector array was employed to determine lifetimes with the recoil-distance Doppler-shift method. rays were observed by one Ge EUROBALL cluster detector and five HPGe detectors. -coincidence data were analyzed with help from the differential decay-curve method, and precise lifetimes for the first excited states were extracted from the and the transitions. Reduced transition strengths were determined and compared to shell-model calculations employing four interactions KB3G, FPD6, GXPF1A, and GXPF1Br. The calculations were also performed for the isotonic chain from to . Inspection of the wave functions as well as particle-plus-rotor model calculations allow for a detailed understanding of the excited states and the reduced transition strength in . The interactions GXPF1A and GXPF1Br reproduce well the experimental findings in and in other isotones.
- Received 17 May 2021
- Accepted 9 August 2021
DOI:https://doi.org/10.1103/PhysRevC.104.034310
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