Speaker
Description
Laser Photodetchment Threshold Spectroscopy on
Radioactive Negative Ions
Uldis Bērziņš
Laboratory of Atomic Physics, Atmospheric Physics and Photochemistry,
Institute of Atomic Physics and Spectroscopy, University of Latvia.
Recently, the Laser Photodetachment Threshold Method was adapted for the measurements of radioactive negative ions. GANDALPH (Gothenburg ANion Detector for Affinity measurements by Laser PHotodetachment) apparatus was designed to study radioactive isotopes. And is placed at CERN at the ISOLDE [1] facility. The measurement of electron affinity of 128I− was a first demonstration of capacity to determine the isotope shift of iodine [2], and it was followed by Electron Affinity measurement in Astatine [3]. With implementation of ion trap MIRACLS (Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy) [4] it opens up the opportunity for future studies of the fundamental properties of negatively charged radioactive isotope such as Chlorine [5] and Polonium as next.
Due to our expertise in isotope shift measurements in electron affinities of Chlorine [6] we were invited to join the MIRACLS group for trapping the Chlorine anions during summer 2022. Based on results of this collaboration I submitted application for funding at Latvian Council of Science. Our project is supported for next 3 years. In my presentation I’ll report on our experimental facility, results of latest experiments and vision for next experiments in CERN and at University of Latvia.
Acknowledgments
Activities in CERN were supported by ERDF projects: No. 1.1.1.5/19/A/003: “Development of quantum optics and Photonics in University of Latvia” and ERDF project No. 1.1.1.1/19/A/144 “Technologic research for elaborating the next generation boron ion implantation apparatus with TRL level near to 4"
References
1. https://home.cern/science/experiments/isolde
2. Rothe S., et al (2017), J. Phys. G: Nucl. Part. Phys. 44 1040032
3. Leimbach, D., et al (2020),Nat Commun 11, 3824 (2020). https://doi.org/10.1038/s41467-020-17599-2
4. Sels S., et al (2020), Nucl.Instrum. Meth. B, Vol 463 310-314
5. E.Leistenschneider E., …, Berzinsh U et al., (2022), 28th International Nuclear Physics Conference, in Cape Town, South Africa from 11-16 September 2022.
6. U. Berzinsh, et.al., (1995)., “Isotope shift in the electron affinity of chlorine,” Phys. Rev. A 51, 231)
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