Abstract
For the production of exotic nuclei at the IGISOL facility, an ion guide for neutron-induced fission has been developed and tested in experiments. Fission fragments are produced inside the ion guide and collected using a helium buffer gas. Meanwhile, a GEANT4 model has been developed to simulate the transportation and stopping of the charged fission products. In a recent measurement of neutron-induced fission yields, implantation foils were located at different positions in the ion guide. The gamma spectra from these foils and the fission targets are compared to the results from the GEANT4 simulation. In order to allow fission yield measurements in the low yield regions, towards the tails and in the symmetric part of the mass distribution, the stopping and extraction efficiency of the ion guide has to be significantly improved. This objective can be achieved by increasing the size while introducing electric field guidance using a combination of static electrodes and an RF-carpet. To this end, the GEANT4 model is used to optimise the design of such an ion guide.
Highlights
In order to determine independent fission yields for neutron-induced fission, a proton-neutron converter [1] and an ion guide [2] in which fission fragments are produced and collected has been developed at the IGISOL facility [3] at the University of Jyväskylä, Finland
In this article we focus on the benchmark of a simulation model for the ion guide which has been developed with the aim of improving the collection efficiency
Mass number (A) and charge number (Z) of the fission products (FPs) are extracted from fission yield distributions obtained from GEF for each integer neutron energy while the the kinetic energy is sampled from the energy distribution of the corresponding isobar
Summary
In order to determine independent fission yields for neutron-induced fission, a proton-neutron converter [1] and an ion guide [2] in which fission fragments are produced and collected has been developed at the IGISOL facility [3] at the University of Jyväskylä, Finland. A measurement campaign of neutron-induced fission yields was conducted in 2016. In this experiment, a β−γ spectroscopy station was used to identify the fission products (FPs). In this article we focus on the benchmark of a simulation model for the ion guide which has been developed with the aim of improving the collection efficiency. In the experiment for neutron-induced fission, spectroscopy measurements of implantation foils that were located in the ion guide were conducted after the proton beam was turned off, but the data has not been analyzed until now. FPs stopped in those implantation foils would emit γ rays during the measurement peri-
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