Simulations of the stopping efficiencies of fission ion guides

Niklas Nilsson,Martin Norlin,S Rinta‐Antila ,Stephan Pomp,D Gorelov ,I D Moore ,A Mattera ,A Jokinen ,Vasileios Rakopoulos,V S Kolhinen ,Mattias Lantz,Vasily Simutkin,Ali Al-Adili,Kaj Jansson,H Penttilä ,Andreas Solders,Alexander V Prokofiev

doi:10.1051/epjconf/201714603025

Niklas Nilsson, Martin Norlin + Show 15 more

Open Access

https://doi.org/10.1051/epjconf/201714603025

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Abstract

With the Ion Guide Isotope Separator On-Line (IGISOL) facility, located at the University of Jyvaskyla, products of nuclear reactions are separated by mass. The high resolving power of the JYFLTRAP Penning trap, with full separation of individual nuclides, capacitates the study of nuclides far from the line of stability. For the production of neutron-rich medium-heavy nuclides, fissioning of actinides is a feasible reaction. This can be achieved with protons from an in-house accelerator or, alternatively, with neutrons through the addition of a newly developed Be(p,xn)-converter. The hereby-obtained fission products are used in nuclear data measurements, for example fission yields, nuclear masses, Q-values and decay spectroscopy. Prior to separation, the ionized reaction products are stopped in a helium-filled gas cell, referred to as the ion-guide. In this work we present simulations of the stopping of fission products in an ion guide developed for neutron-induced fission. The production and extraction rates are evaluated and compared against experimental values.

Highlights

Independent fission product yields are an important characteristic of nuclear fission and better knowledge of how the yield distributions varies with fissioning system will improve our understanding of the fission process
With the Ion Guide Isotope Separator On-Line (IGISOL) facility, located at the University of Jyvaskyla, products of nuclear reactions are separated by mass
In this work we present simulations of the stopping of fission products in an ion guide developed for neutron-induced fission

Summary

Introduction

Independent fission product yields are an important characteristic of nuclear fission and better knowledge of how the yield distributions varies with fissioning system will improve our understanding of the fission process. At the physics laboratory of the University of Jyvaskyla, independent fission product yields have been measured for proton induced fission of nat U using the Ion Guide and Isotope Separator On-Line (IGISOL) technique [4]. Using this technique, fission is induced in a target situated in a helium gas filled container, called an ion guide. A single isobaric chain is selected and transported to the Penning trap, JYFLTRAP, where isobaric separation based on mass is performed at a resolving power of more than 105 With this method independent fission yields can be measured through direct ion counting just a few hundred milliseconds after fission

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