Developments towards in-gas-jet laser spectroscopy studies of actinium isotopes at LISOL

Raeder, S.; Bastin, B.; Block, M.; Creemers, P.; Delahaye, P.; Ferrer, R.; Fléchard, X.; Franchoo, S.; Ghys, L.; Gaffney, L. P.; Granados, C.; Heinke, Reinhard; Hijazi, L.; Huyse, M.; Kron, T.; Kudryavtsev, Yu.; Laatiaoui, M.; Lecesne, N.; Luton, F.; Moore, I. D.; Martinez, Y. N.; Mogilevskiy, E. I.; Naubereit, P.; Piot, J.; Rothe, S.; Savajols, H.; Sels, S.; Sonnenschein, V.; Traykov, E.; Beveren, C. Van; Bergh, P. Van den; Duppen, P. Van; Wendt, Κ.; Zadvornaya, A.

doi:10.1016/j.nimb.2015.12.014

Cited by 24 publications

(18 citation statements)

References 25 publications

(31 reference statements)

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“…The data for the electron spectrum of Ac presented in the NIST database [1] miss many levels and there are indications that some of the data are not accurate [2], see also Refs. [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Calculations of the atomic structure for the low-lying states of actinium

2019

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We employ a technique that combines the configuration interaction method with the singlesdoubles coupled-cluster method to perform calculation of the energy levels, transition amplitudes, lifetimes, g-factors, and magnetic dipole and electric quadrupole hyperfine structure constants for many low-lying states of neutral actinium. We find very good agreement with existing experimental energy levels and make accurate predictions for missing levels. It has been noted that some of the levels have been previously misidentified; our analysis supports this claim. If spectroscopy is performed with actinium-225, our calculations will lead to values for nuclear structure constants. The accuracy of this can be constrained by comparing with actinium-227.

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Section: Introductionmentioning

confidence: 99%

Calculations of the atomic structure for the low-lying states of actinium

2019

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“…Given the current developments towards high-resolution RIS of exotic nuclei in e.g. collinear RIS [7] and in-gas-jet laser spectroscopy [8,9], a detailed understanding of the interaction of atoms with pulsed lasers is vital.…”

Section: Introductionmentioning

confidence: 99%

Efficient, high-resolution resonance laser ionization spectroscopy using weak transitions to long-lived excited states

et al. 2017

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Laser spectroscopic studies on minute samples of exotic radioactive nuclei require very efficient experimental techniques. In addition, high resolving powers are required to allow extraction of nuclear structure information. Here we demonstrate that by using weak atomic transitions, resonance laser ionization spectroscopy is achieved with the required high efficiency (1-10%) and precision (linewidths of tens of MHz). We illustrate experimentally and through the use of simulations how the narrow experimental linewidths are achieved and how distorted resonance ionization spectroscopy lineshapes can be avoided. The role of the delay of the ionization laser pulse with respect to the excitation laser pulse is crucial: the use of a delayed ionization step permits the best resolving powers and lineshapes. A high efficiency is maintained if the intermediate level has a lifetime that is at least of the order of the excitation laser pulse width. A model that describes this process reproduces well the observed features and will help to optimize the conditions for future experiments a .

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“…1. Ionization scheme with vacuum wavelengths for actinium [31,32]. The right-hand side shows the hyperfine splitting for a I = 3/2 nuclear spin (not to scale) together with a corresponding example hyperfine spectrum of 227 Ac.…”

Section: Experimental Set-upmentioning

confidence: 99%