Search for octupole-deformed actinium isotopes using resonance ionization spectroscopy

Verstraelen, E.; Teigelhöfer, A.; Ryssens, Wouter; Ames, F.; Barzakh, A. E.; Bender, M.; Ferrer, R.; Goriely, Serge; Heenen, Paul‐Henri; Huyse, M.; Kunz, P.; Lassen, J.; Manea, V.; Raeder, S.; Duppen, P. Van

doi:10.1103/physrevc.100.044321

Cited by 29 publications

(22 citation statements)

References 93 publications

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“…The ground state tran-470 sition at 438.57 nm vac shows a large HFS splitting and has been studied off-line with high resolution using an injection-locked narrow bandwidth Ti:sapphire laser in a crossed beam arrangement with a hot cavity atomizer. Finally, the ionization scheme was applied in a hot cavity at TRIUMF [69,82] and in-gas-cell 475 at LISOL [11]. Because of the limited resolution only the HFS splitting of the upper level was resolved, which has a low sensitivity to the B-Factor and thus to the spectroscopic quadrupole moment.…”

Section: Actinium (Z=89)mentioning

confidence: 99%

“…For in-source [82] and crossed-beam spectroscopy, both performed at high vacuum conditions, laser powers below 100 nJ (1 mW) were applied for the first step at 438 nm. Considering the change in illuminated area for the gas jet application as summarized in Tab.…”

Section: Actinium (Z=89)mentioning

confidence: 99%

“…Starting from the closed neutron shell N=126 the isotopes of the actinide nuclei are increasing in deformation up to the deformed sub-shell closure at N=152. Additional nuclear effects such as the localized occurrence of octupole deformation around N=132 [82] and the isomers in the heavy actinide region, which allow to probe single particle configuration of higher orbitals, are important for an in-depth understanding of underlying nuclear properties. Atomic levels and transitions have been reported for the actinides up to the element fermium (Fm, Z = 100).…”

Section: Actinides Up To Fermiummentioning

confidence: 99%

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Performance of Dye and Ti:sapphire laser systems for laser ionization and spectroscopy studies at S3

Raeder

Ferrer

Granados

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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The novel and sensitive In-Gas Laser Ionization Spectroscopy (IGLIS) technique enables high-precision laser spectroscopy of the heaviest elements and isotopes very far from stability that are produced in fusion-evaporation reactions at in-flight separators. Powerful and dedicated laser systems are required in these facilities to realize in-gas jet laser spectroscopy with optimal spectral resolution and efficiency. The performance with respect to the requirements for IGLIS studies at the low energy front-end of the Super Separator Spectrometer (S 3 ) at GANIL, France, of Dye and Ti:sapphire laser systems is investigated. In addition, a number of specific experimental cases on key isotopes of the elements Ag, Sn, Ac, and No are discussed in detail.

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Section: Actinium (Z=89)mentioning

confidence: 99%

Section: Actinium (Z=89)mentioning

confidence: 99%

Section: Actinides Up To Fermiummentioning

confidence: 99%

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Performance of Dye and Ti:sapphire laser systems for laser ionization and spectroscopy studies at S3

Raeder

Ferrer

Granados

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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“…Finally, note that the integrated photoabsorption cross section and the centroid energy can be related to the charge mean square radius and the mean proton distance [60,61] and similarly the polarizability is directly proportional to the mean square radius [12]. Since mean-field models with blocking techniques are known to reproduce rather well charge radii, including the odd-even staggering [62,63], we can expect our blocking approximation in the Gogny-HFB mass model to give a fair, though not complete, representation of the E 1 moments in odd-even nuclei.…”

Section: B Axially Deformed Gogny-hfb+qrpa Calculationsmentioning

confidence: 99%

E1moments from a coherent set of measured photoneutron cross sections

et al. 2020

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“…In recent years an explosion of high-quality measurements of charge radii is observed (see, for example, review [3]). They cover, for example, in recent years the K [10], Ca [11,12], Cu [13], Cd [14], Sn [15,16], Hg [17], Bi [18], At [19], Ac [20] and No [21] isotopic chains. These experimental studies are supplemented mostly by a theoretical analysis within non-relativistic Skyrme or Fayans DFTs (see overview below) and occasionally by the analysis within Gogny DFT (the Ca isotopes in Ref.…”

Section: Introductionmentioning

confidence: 99%

Charge radii in covariant density functional theory: a global view

Perera,

Afanasjev,

Ring

2021

Preprint

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A systematic global investigation of differential charge radii has been performed within the CDFT framework for the first time. Theoretical results obtained with conventional covariant energy density functionals and separable pairing interaction of Ref.[1] are compared with experimental differential charge radii in the regions of the nuclear chart in which available experimental data crosses neutron shell closures at N = 28, 50, 82 and 126. The analysis of absolute differential radii of different isotopic chains and their relative properties indicate clearly that such properties are reasonably well described in model calculations in the cases when the mean-field approximation is justified. However, while the observed clusterization of differential charge radii of different isotopic chains is well described above the N = 50 and N = 126 shell closures, it is more difficult to reproduce it above the N = 28 and N = 82 shell closures because of possible deficiencies in underlying single-particle structure. The impact of the latter has been evaluated for spherical shapes and it was shown that the relative energies of the single-particle states and the patterns of their occupation with increasing neutron number have an appreciable impact on the evolution of the δ r 2 N,N values. These factors also limit the predictive power of model calculations in the regions of high densities of the single-particle states of different origin. It is shown that the kinks in the charge radii at neutron shell closures are due to the underlying single-particle structure and due to weakening or collapse of pairing at these closures. The regions of the nuclear chart in which the correlations beyond mean-field are expected to have an impact on charge radii are indicated; the analysis shows that the assignment of a calculated excited prolate minimum to the experimental ground state allows to understand the trends of the evolution of differential charge radii with neutron number in many cases of shape coexistence even at the mean-field level. It is usually assumed that pairing is a dominant contributor to odd-even staggering (OES) in charge radii. Our analysis paints a more complicated picture. It suggests a new mechanism in which the fragmentation of the single-particle content of the ground state in odd-mass nuclei due to particle-vibration coupling provides a significant contribution to OES in charge radii.

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Search for octupole-deformed actinium isotopes using resonance ionization spectroscopy

Abstract: † This article contains part of the experimental work performed during Teigelhöfer's Ph.D. thesis. ‡ Deceased.

Cited by 29 publications

References 93 publications

Performance of Dye and Ti:sapphire laser systems for laser ionization and spectroscopy studies at S3

Performance of Dye and Ti:sapphire laser systems for laser ionization and spectroscopy studies at S3

E1moments from a coherent set of measured photoneutron cross sections

Charge radii in covariant density functional theory: a global view

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