Characterization of 233U alpha recoil sources for 229()Th beam production
Autor: | Timo Sajavaara, Iain Moore, Ilkka Pohjalainen |
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Rok vydání: | 2020 |
Předmět: |
Nuclear and High Energy Physics
Physics - Instrumentation and Detectors Materials science Physics::Instrumentation and Detectors 010308 nuclear & particles physics Radioactive source FOS: Physical sciences Thorium chemistry.chemical_element Instrumentation and Detectors (physics.ins-det) Radiation Rutherford backscattering spectrometry 01 natural sciences Ion source Recoil chemistry 0103 physical sciences Gamma spectroscopy Nuclear Experiment (nucl-ex) Atomic physics Nuclear Experiment 010306 general physics Spectroscopy Instrumentation |
Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 463:441-448 |
ISSN: | 0168-583X |
DOI: | 10.1016/j.nimb.2019.04.027 |
Popis: | Radioactive $^{233}$U alpha recoil sources are being considered for the production of a thorium ion source to study the low-energy isomer in $^{229}$Th with high-resolution collinear laser spectroscopy at the IGISOL facility of the University of Jyv\"askyl\"a. In this work two different $^{233}$U sources have been characterized via alpha and gamma spectroscopy of the decay radiation obtained directly from the sources and from alpha-recoils embedded in implantation foils. These measurements revealed rather low $^{229}$Th recoil efficiencies of only a few percent. Although the low efficiency of one of the two sources can be attributed to its inherent thickness, the low recoil efficiency of the second, thinner source, was unexpected. Rutherford backscattering spectrometry (RBS) was performed to investigate the elemental composition as a function of depth revealing a contamination layer on top of the thin source. The combination of spectroscopic methods proves to be a useful approach in the assessment of alpha recoil source performance in general. Comment: 10 pages, 12 figures, 1 table, submitted to Nuclear Instruments and Methods B, EMIS 2018 |
Databáze: | OpenAIRE |
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