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Yu. Kudryavtsev

Bio: Yu. Kudryavtsev is an academic researcher from Katholieke Universiteit Leuven. The author has contributed to research in topics: Ionization & Ion source. The author has an hindex of 20, co-authored 53 publications receiving 1006 citations.
Topics: Ionization, Ion source, Neutron, Spectroscopy, Laser


Papers
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Journal ArticleDOI
TL;DR: The on-line application of atomic laser ionization spectroscopy in a supersonic gas jet is demonstrated, a technique suited for high-precision studies of the ground- and isomeric-state properties of nuclei located at the extremes of stability.
Abstract: Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion beam facilities to produce pure beams of exotic nuclei and measure the shape, size, spin and electromagnetic multipole moments of these nuclei. However, in such measurements it is difficult to combine a high efficiency with a high spectral resolution. Here we demonstrate the on-line application of atomic laser ionization spectroscopy in a supersonic gas jet, a technique suited for high-precision studies of the ground- and isomeric-state properties of nuclei located at the extremes of stability. The technique is characterized in a measurement on actinium isotopes around the N=126 neutron shell closure. A significant improvement in the spectral resolution by more than one order of magnitude is achieved in these experiments without loss in efficiency.

89 citations

Journal ArticleDOI
TL;DR: In this paper, a step-wise resonance ionization spectroscopy (RIS) of radioactive atoms in different types of supersonic gas jets is proposed to increase the spectral resolution by one order of magnitude in comparison with the currently performed in-gas-cell ionization.
Abstract: New approaches to perform efficient and selective step-wise resonance ionization spectroscopy (RIS) of radioactive atoms in different types of supersonic gas jets are proposed. This novel application results in a major expansion of the in-gas laser ionization and spectroscopy (IGLIS) method developed at KU Leuven. Implementation of resonance ionization in the supersonic gas jet allows to increase the spectral resolution by one order of magnitude in comparison with the currently performed in-gas-cell ionization spectroscopy. Properties of supersonic beams, obtained from the de Laval-, the spike-, and the free jet nozzles that are important for the reduction of the spectral line broadening mechanisms in cold and low density environments are discussed. Requirements for the laser radiation and for the vacuum pumping system are also examined. Finally, first results of high-resolution spectroscopy in the supersonic free jet are presented for the 327.4 nm 3d104s 2S1/2→ 3d104p 2P1/2 transition in the stable 63Cu isotope using an amplified single mode laser radiation.

77 citations

Journal ArticleDOI
TL;DR: The comparison of the measured isotope shifts in (200-210)Po with a previous data set allows us to test for the first time recent large-scale atomic calculations that are essential to extract the changes in the mean-square charge radius of the atomic nucleus.
Abstract: In-source resonant ionization laser spectroscopy of the even-A polonium isotopes 192 210,216,218 Po has been performed using the 6p 3 7s 5 S2 to 6p 3 7p 5 P2 (� = 843.38 nm) transition in the polonium atom (Po-I) at the CERN ISOLDE facility. The comparison of the measured isotope shifts in 200 210 Po with a previous data set allows to test for the first time recent large-scale atomic calculations that are essential to extract the changes in the mean-square charge radius of the atomic nucleus. When going to lighter masses, a surprisingly large and early departure from sphericity is observed, which is only partly reproduced by Beyond Mean Field calculations.

71 citations

01 Jan 1991
TL;DR: In this paper, high-resolution laser spectroscopy for the study of nuclear sizes and shapes has been used for the detection of single atoms and ionization of atoms for nuclear physics.
Abstract: High-resolution laser spectroscopy for the study of nuclear sizes and shapes J Billowes and P Campbell High resolution laser spectroscopy of atomic systems R C Thompson High-resolution laser spectroscopy of Fr ns and nd Rydberg levels E Arnold, W Borchers, M Carre et al. Resonance laser ionization of atoms for nuclear physics V N Fedosseev, Yu Kudryavtsev and V I Mishin Laser detection of single atoms Viktor I Balykin, G I Bekov, V S Letokhov et al. Precision atomic physics techniques for nuclear physics with radioactive beams Klaus Blaum, Jens Dilling and Wilfried Nortershauser Resonance ionization spectroscopy on a fast atomic ytterbium beam

56 citations

Journal ArticleDOI
TL;DR: For the first time, in-gas-cell laser spectroscopy study of the (57,59,63,65)Cu isotopes has been performed using the 244.164 nm optical transition from the atomic ground state of copper.
Abstract: For the first time, in-gas-cell laser spectroscopy study of the $^{57,59,63,65}\mathrm{Cu}$ isotopes has been performed using the 244.164 nm optical transition from the atomic ground state of copper. The nuclear magnetic dipole moments for $^{57,59,65}\mathrm{Cu}$ relative to that of $^{63}\mathrm{Cu}$ have been extracted. The new value for $^{57}\mathrm{Cu}$ of $\ensuremath{\mu}(^{57}\mathrm{Cu})=+2.582(7){\ensuremath{\mu}}_{N}$ is in strong disagreement with the previous literature value but in good agreement with recent theoretical and systematic predictions.

51 citations


Cited by
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Journal ArticleDOI
01 Apr 1988-Nature
TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

9,929 citations

Journal ArticleDOI
TL;DR: In this article, the root-mean-square (rms) nuclear charge radii R obtained by combined analysis of two types of experimental data: (i) radii changes determined from optical and, to a lesser extent, K α X-ray isotope shifts and (ii) absolute radii measured by muonic spectra and electronic scattering experiments.

1,172 citations

01 Apr 2001
TL;DR: In this paper, the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even-even nuclides are given in Table I.
Abstract: Adopted values for the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even–even nuclides are given in Table I. Values of τ, the mean life of the 2+ state; E, the energy; and β, the quadrupole deformation parameter, are also listed there. The ratio of β to the value expected from the single-particle model is presented. The intrinsic quadrupole moment, Q0, is deduced from the B(E2)↑ value. The product E×B(E2)↑ is expressed as a percentage of the energy-weighted total and isoscalar E2 sum-rule strengths. Table II presents the data on which Table I is based, namely the experimental results for B(E2)↑ values with quoted uncertainties. Information is also given on the quantity measured and the method used. The literature has been covered to November 2000. The adopted B(E2)↑ values are compared in Table III with the values given by systematics and by various theoretical models. Predictions of unmeasured B(E2)↑ values are also given in Table III.

955 citations

Journal ArticleDOI
TL;DR: The theoretical status of coexistence in nuclei is summarized in this article, where microscopic shell-model descriptions and mean-field descriptions are emphasized, and a systematic data for both even and odd-mass nuclei, selected to illustrate the various ways in which coexistence is observed in nucleis.
Abstract: Shape coexistence in nuclei appears to be unique in the realm of finite many-body quantum systems It differs from the various geometrical arrangements that sometimes occur in a molecule in that in a molecule the various arrangements are of the widely separated atomic nuclei In nuclei the various ''arrangements'' of nucleons involve (sets of) energy eigenstates with different electric quadrupole properties such as moments and transition rates, and different distributions of proton pairs and neutron pairs with respect to their Fermi energies Sometimes two such structures will ''invert'' as a function of the nucleon number, resulting in a sudden and dramatic change in ground-state properties in neighboring isotopes and isotones In the first part of this review the theoretical status of coexistence in nuclei is summarized Two approaches, namely, microscopic shell-model descriptions and mean-field descriptions, are emphasized The second part of this review presents systematic data, for both even- and odd-mass nuclei, selected to illustrate the various ways in which coexistence is observed in nuclei The last part of this review looks to future developments and the issue of the universality of coexistence in nuclei Surprises continue to be discovered With the major advances in reaching to extremes of proton-neutronmore » number, and the anticipated new ''rare isotope beam'' facilities, guidelines for search and discovery are discussed« less

570 citations

Journal ArticleDOI
TL;DR: The mass of the nucleus has been of capital importance not only for various aspects of nuclear physics, but also for other branches of physics, notably weak-interaction studies and astrophysics as mentioned in this paper.
Abstract: The mass of the nucleus, through its binding energy, continues to be of capital importance not only for various aspects of nuclear physics, but also for other branches of physics, notably weak-interaction studies and astrophysics. The authors first describe the modern experimental techniques dedicated to the particularly challenging task of measuring the mass of exotic nuclides and make detailed comparisons. Though tremendous progress in these and the associated production techniques has been made, allowing access to nuclides very far from stability, it is still not yet possible to produce many nuclides involved in stellar nucleosynthesis, especially the $r$ process, leaving no choice but to resort to theory. The review thus goes on to describe and critically compare the various modern mass formulas that may be used to extrapolate from the data towards the neutron drip line. Special attention is devoted to the crucial interplay between theory and experiment, showing how new measurements far from stability can considerably reduce the ambiguity in extrapolations to nuclides even further away.

555 citations