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#28203

Fission properties of rutherfordium isotopes
Pavol Mošať
Comenius University, 84248 Bratislava, Slovakia
pavol.mosat@fmph.uniba.sk

In the region of transfermium elements the process of spontaneous fission (SF) is critical decay mode, influencing their stability. The SF barriers decrease dramatically with increasing mass number. According to the liquid drop model, the fission barrier heights are close to zero for the isotopes with A > 270. These nuclei are stabilized mainly by microscopic effects resulting from the nuclear shell model. Systematic studies of SF properties in the region of heavy elements are crucial for understanding of these stabilizing effects and for determining the production possibilities of exotic nuclei in the region of the heaviest elements.



Precisely performed fusion-evaporation reactions aimed at the production of rutherfordium (Z = 104) and dubnium (Z = 105) isotopes and measurements of their decay properties were carried out in GSI Darmstadt using velocity filter SHIP.

In this work the SF decay properties of isotopes produced in reactions 50Ti + 208Pb and 50Ti + 207Pb (compound nuclei 258Rf and 257Rf) will be presented. Decay properties of nobelium isotopes produced through alpha decay of rutherfordium isotopes will be discussed. Attention will be also aimed at the unexpected differences in decay probabilities in direct and indirect isotope production.
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