Investigating radioactive negative ion production via double electron capture

The relative cross sections for radioactive negative ion production via double electron capture have been measured for collisions between a 40 keV projectile beam of uranium-238 and potassium vapor. This was performed at the collinear resonance ionization spectroscopy (CRIS) experiment at CERN-ISOLD...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2023-08, Vol.541 (C), p.264-267
Main Authors: Nichols, M., Athanasakis-Kaklamanakis, M., Borschevsky, A., Cocolios, T.E., Crosa-Rossa, R., de Groote, R.P., Flanagan, K.T., Garcia Ruiz, R.F., Geldhof, S., Hanstorp, D., Koszorús, Á., Lalanne, L., Leimbach, D., Neyens, G., Reilly, J., Rothe, S., Wilkins, S.G., Yang, X.F.
Format: Article
Language:English
Subjects:
Charge exchange
CRIS
Electron affinity
Fysik
heavy-ions
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Instruments & Instrumentation
ISOLDE
Negative ion
Nuclear Science & Technology
Physical Sciences
Physics
Radioactive
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Summary:The relative cross sections for radioactive negative ion production via double electron capture have been measured for collisions between a 40 keV projectile beam of uranium-238 and potassium vapor. This was performed at the collinear resonance ionization spectroscopy (CRIS) experiment at CERN-ISOLDE and is a step towards measuring the electron affinities (EAs) of elements that cannot be efficiently produced in negative ion sources at radioactive ion beam (RIB) facilities. This includes short-lived radioactive isotopes that have low production quantities and heavy and superheavy elements that systematically have smaller EAs than work functions of available ion source materials. Negative ions are particularly sensitive to electron–electron correlation effects, which make such studies ideal for benchmarking atomic structure models that go beyond the independent particle model. While the EAs of most light elements have been measured, experimental investigations on heavier elements, namely the actinides, remain scarce due to their radioactive nature and production difficulty. By developing negative ion production by charge exchange, we aim to make these studies feasible at RIB facilities.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2023.04.051