Abstract
Neutron-rich nuclides110Ru and112Ru produced in symmetric fission of238U by 20 MeV protons have been studied at the IGISOL facility by means ofβ-ray,γ-ray and conversion electron spectroscopy. A total of 12 and 6γ-transitions were observed in the decays of110Ru and112Ru, respectively. Multipolarities were determined for a few transitions. The beta decay half-life was determined to be 11.6±0.6 s for110Ru and 1.75±0.07 s for112Ru. As a side product, a new value of 2.1±0.3 s for theβ half-life of the112Rh 1+ state was obtained. The decay energy measured with the plastic scintillator was 2.81 ±0.05 MeV for110Ru and 4.52 ±0.08 MeV for112Ru. The beta decay schemes of110Ru and112Ru isotopes indicate that the main fraction of their beta strength resides in two 0+→1+ spin-flip transitions with their logf t values between 4.4 and 4.7. The decay energies and the energies of the 1+ GT states are compared with the macroscopic-microscopic model calculations. The observed GT-strengths are discussed in the framework of the deformed single-particle model.
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Supported by the Academy of Finland
The authors would like to thank Dr. Jouni Suhonen for fruitful discussions and for the work he has done on pnQRPA-calculations. This work has been financially supported by the Academy of Finland. One of us (M.L.) is indebted to the Wihuri Foundation for a travel grant and two of us (Z.J. and K.R.) acknowledge the support from the Polish Ministry of National Education.
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Jokinen, A., Äystö, J., Dendooven, P. et al. Spin-flipβ − decay of even-even deformed nuclei110Ru and112Ru. Z. Physik A - Hadrons and Nuclei 340, 21–28 (1991). https://doi.org/10.1007/BF01284476
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DOI: https://doi.org/10.1007/BF01284476