1. Simulations of the fission-product stopping efficiency in IGISOL
- Author
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Diego Tarrio, M. Österlund, Ali Al-Adili, Cecilia Gustavsson, Stephan Pomp, Mattias Lantz, Andrea Mattera, Andreas Solders, S. Wiberg, Kaj Jansson, Heikki Penttilä, Vasileios Rakopoulos, Alexander V. Prokofiev, Dmitry Gorelov, and Iain Moore
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Fission products ,Nuclear fission product ,Fission ,Separator (oil production) ,Fission product yield ,Nuclear Experiment ,Penning trap ,Mass spectrometry ,Ion - Abstract
At the Jyvaskyla Ion Guide Isotope Separator On-Line (IGISOL) facility, independent fission yields are measured employing the Penning-trap technique. Fission products are produced, e.g. by impinging protons on a uranium target, and are stopped in a gas-filled chamber. The products are collected by a flow of He gas and guided through a mass separator to a Penning trap, where their masses are identified. This work investigates how fission-product properties, such as mass and energy, affect the ion stopping efficiency in the gas cell. The study was performed using the Geant4 toolkit and the SRIM code. The main results show a nearly mass-independent ion stopping with regard to the wide spread of ion masses and energies, with a proper choice of uranium target thickness. Although small variations were observed, in the order of 5%, the results are within the systematic uncertainties of the simulations. To optimize the stopping efficiency while reducing the systematic errors, different experimental parameters were varied; for instance material thicknesses and He gas pressure. Different parameters influence the mass dependence and could alter the mass dependencies in the ion stopping efficiency.
- Published
- 2015