Spontaneous fission of rutherfordium isotopes - total kinetic energies

Pavol Mosat,Andrew Mistry,Boris Andel,Sigurd Hofmann,Michael Block,Mustapha Laatiaoui,Julien Piot,Birgit Kindler,Zdenka Kalaninova,Bettina Lommel,Stanislav Antalic,Katsuhisa Nishio,Dieter Ackermann,Marija Vostinar,Barbara Sulignano,Fritz Peter Heßberger

doi:10.1051/epjconf/201922301043

Abstract

The isotopes 255,256,258Rf were produced in the fusion-evaporation reactions 50Ti + 207,208Pb and 50Ti + 209Bi at GSI Darmstadt, using the velocity filter SHIP. Total kinetic energies of fragments from spontaneous fission for these isotopes were evaluated with a correction to pulse-height defect.

Highlights

Spontaneous fission (SF) is a decay mode with large impact on the stability of nuclei in the transfermium region
In the case of 255Rf, 256Rf we searched for correlations between an Evaporation residues (ER) implantation signal and a high-energy signal corresponding to SF
For 258Rf instead of the ER implantation signal we used the low-energy signal corresponding to electrons originating from internal conversion process from de-excitation of levels populated after the EC decay 258Db −E−→C 258Rf

Summary

Introduction

Spontaneous fission (SF) is a decay mode with large impact on the stability of nuclei in the transfermium region. Only a few results (often based on limited statistics of SF events) with measured total kinetic energy (TKE) were obtained for rutherfordium (Z = 104) isotopes [2,3,4,5].

Results

Conclusion