Recent Collinear Resonance Ionisation Spectroscopy (CRIS) experiments at ISOLDE-CERN

by Mr Bram van den Borne (KU Leuven)

201 (Large meeting room) (RIBF bldg.)

201 (Large meeting room)

RIBF bldg.


The 40th Nuclear Structure Group (Nuclear Spectroscopy Laboratory) Seminar

・Lecturer: Mr. Bram van den Borne (KU Leuven)

・Title: Recent Collinear Resonance Ionisation Spectroscopy (CRIS) experiments at ISOLDE-CERN

・Language: English

・Date: April 14 (Fri.), 2023, 15:00 -

・Place: RIBF 2F Large Meeting room + Zoom (the zoom URL will be distributed)

Exploring nuclear properties far from stability is a powerful tool to investigate our understanding of the nuclear structure, and challenge state-of-the-art nuclear theory. Laser spectroscopy can measure many ground-state properties (spin, nuclear electromagnetic moments, changes in the charge radius) upon which the structure of these nuclei is based. Furthermore, its application at ISOL facilities can give access to the same properties for long-lived states (>10ms). The Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at ISOLDE-CERN exploits the high selectivity of resonant ionisation spectroscopy combined with the high resolution of collinear laser spectroscopy to measure these ground-state properties of radioactive nuclei and molecules. Recently, the elements indium[1] (Z =49) and silver[2] (Z =47), and the molecules RaF[3−4] (Z =88+9) and AcF[5] (Z =89+9) were studied at CRIS successfully.

In this seminar I will present the core principles of the CRIS experiment at ISOLDE-CERN and the results of these experiments. The nuclear spin and electromagnetic properties of several isomeric states were deduced for indium and silver, and various molecular electronic levels were identified in RaF and AcF. These data provide a benchmark for both nuclear and atomic theory, further broadening our knowledge close to the nuclear shell closure (Z =50) and molecular electronic structure.

[1] A. Vernon et al., Nature 607 (2022) 260-265.
[2] R.P. de Groote et al., CERN-INTC-2020 / INTC-P-551 (2020).
[3] R.F. Garcia Ruiz et al., CERN-INTC-2018 / INTC-P-546 (2018).
[4] S. Udrescu et al., Nature Physics (2023) (submitted).
[5] M. Athanasakis-Kaklamanakis et al., CERN-INTC-2021 / INTC-P-615 (2021).