A high resolution study of the transitions 4f 76s 2?4f 76s6p in the Eu I-spectrum

Zaal, G J; Hogervorst, W.; Eliel, E. R.; Leeuwen, K. A. H. van; Blök, J.

doi:10.1007/bf01408393

Cited by 48 publications

(23 citation statements)

References 21 publications

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“…Owing to the small and partially resolved groundstate splitting it was imperative to use fixed ratios A~/A~=ll.49(7) and 10.94 (2), and B~/B~= -322(4) and 421 (3) for the 4,594 and 4,627A lines, respectively; these values were taken from precision measurements on the stable isotopes by ABMR for the ground state [17] and by laser spectroscopy for the excited states [16]. The isotopic changes of these ratios (e.g.…”

Section: Resultsmentioning

confidence: 99%

“…a The estimated error in 2 takes into account the error of the IS measurement, an assumed uncertainty of 5 5o in the evaluation of the F-factor, and (0+_0.5) NMS for the SMS. Except for ~4~ where the IS is small, the major contribution is from the uncertainty in the F-factor firmed, for the isotopes 142_<A_< 151, by the observation that the ratios of the measured A factors of both states all agree with the one for ~5~Eu, although the hyperfine anomaly in the one state should be about 5 times as large as that in the other [16]. Therefore, we have taken the magnetic moments calculated from the YPT/2 splitting without introducing additional errors.…”

Section: Nuclear Momentsmentioning

confidence: 92%

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Nuclear spins, moments, and changes of the mean square charge radii of140?153Eu

et al. 1985

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Section: Resultsmentioning

confidence: 99%

Section: Nuclear Momentsmentioning

confidence: 92%

Nuclear spins, moments, and changes of the mean square charge radii of140?153Eu

et al. 1985

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“…The values of ~a differ from the values of YA within the limits of 5 6%, due to small magnitudes of the $1,... coefficients in (2). For the evaluation of 7~54 the IS data from [15,15] have been used. It is worth mentioning that the 7a values do not depend on the electronic factor F. Thus, the uncertainty in ~Ta is determined by IS experimental errors and a mass shift uncertainty only.…”

Section: Ya=2a (R2)a_ Ia/a (R2)a_ Ia+ Imentioning

confidence: 99%

Odd-even staggering in nuclear charge radii of neutron-rich europium isotopes

Alkhazov

Barzakh

Bol’shakov

et al. 1990

Z. Physik A - Atomic Nuclei

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Nuclear magnetic dipole and electric quadrupole moments and changes in mean square charge radii for the neutron-rich 155-159Eu isotopes have been measured using resonance ionization spectroscopy at the IRIS facility. It has been found that the isotopes with N > 92, unlike the isotopes with 89 < N < 92, have an ordinary character of odd-even staggering in nuclear charge radii. This means that the octupole deformation attributed previously to the europium nuclei around 154Eu does not display itself in the charge radii of heavier europium isotopes.PACS: 21.10.Ft, Ky; 31.30.GsThe odd-even staggering (OES) of nuclear-charge radii is a very remarkable effect. It consists in the fact that the mean square charge radius (r z) of an odd-N nucleus is always (with a few exceptions) smaller than the average value of the radii for its even-N neighbours (the normal OES).The staggering effect is expressed by the parameterwhere A (r2)a_l,A = (r2)A -(rZ)A _ ~ with A being the atomic number of an odd-N nucleus. For the normal OES, 7,~ < 1. The OES is understood qualitatively as an effect of pairing giving rise to an enlarged zero-point vibration amplitude in even-N nuclei [1]. It has been shown also [-2] that three-and four-body correlations may be essential in forming the normal staggering. However, there are a few instances with YA > 1 (the inverted OES). Many of them are considered to be due to a shape instability, when a sudden onset of nuclear quadrupole deformation occurs as, for example, in the cases of the neutron deficient 7] isotopes the inverted OES is likely to be connected with the octupole degree of freedom. The invertion takes place exactly in those nuclei for which reflection-asymmetric shapes were theoretically predicted and suggested also by some nuclear spectroscopic evidence. It was found also [6], that the normal staggering is restored towards the isotopes which are supposed to be reflection-symmetric. A marked inverted OES was observed also in the vicinity of 154Eu in the course of isotope shift (IS) investigations at the IRIS facility [8]. The conception of quadrupole deformation instability can not be used to interpret the found inversion because all the nuclei involved (153,154,155Eu ) have stable and strong quadrupole deformation, as it is well known from the quadrupole moments [8] and rotational bands for these nuclei [9]. Recently, as a result of thorough analysis of a good many spectroscopic information, Sheline [10] has come to the conclusion that there is a sizeable stable octupole deformation in 153,154,155Eu ' the deformation parameter/13 for the odd-neutron a54Eu being greater than for the adjacent even-N nuclei. According to [10] this difference in the values of f13 is responsible for the inverted OES observed in Eu isotopes. In this connection a question of importance arises: whether this unusual behaviour of A (r 2) (the inverted OES) will remain for the more neutron-rich Eu isotopes; or, whether the region of stable octupole deformation comprises these nuclei too.To answer this question we ha...

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“…Until now the hyperfine structure (hfs) and the isotope shift (IS) of the levels belonging to configurations: 4 f 7 6s 6p [1][2][3], 4 / 7 5d 6p [-4, 5], 4 / 7 5d 6s [6][7][8][9][10], 4f76d6s [I1], 4f76s7s [12] and 4f76sSs [1][2][3][4][5][6][7][8][9][10][11][12][13] have been investigated with high accuracy by laser-spectroscopic methods in both stable europium isotopes 15~Eu and 153Eu" The hfs of the ground level 4 f 7 6s 2 SS7/z has been very accurately measured by atomic-beam-methods [-14, 15]. Recently Childs [16] using atomic-beam laser-rf double-resonance technique obtained also very precise values for the hfs splitting in ten 4f75d6s I°Dj and SDj levels of the ~ 51,153Eu I.…”

Section: Introductionmentioning

confidence: 99%

Hyperfine structure constants and isotope shift of the levels of the configuration 4f 6 5d 6s 2 in Eu I

Elantkowska

Bernard

Dembczyński

et al. 1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The hyperfine structure (hfs) and the isotope shift (IS) of transitions between metastable levels of the configuration 4f 7 5d 6s and levels of the configuration 4 f 6 5d 6s 2 of 151Eu and ~53Eu were studied by means of the high resolution laser-atomic-beam technique. New data for the hfs in 151Eu and 153Eu were obtained as well as new and more accurate for the IS between ~5~Eu and 153Eu. The measured hfs constants A and B of the 4 f 6 5d 6s 2 configuration allow to perform a parametric analysis using the Sandars and Beck theory. The value of the Sternheimer correction is also disscused.

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A high resolution study of the transitions 4f 76s 2?4f 76s6p in the Eu I-spectrum

Cited by 48 publications

References 21 publications

Nuclear spins, moments, and changes of the mean square charge radii of140?153Eu

Nuclear spins, moments, and changes of the mean square charge radii of140?153Eu

Odd-even staggering in nuclear charge radii of neutron-rich europium isotopes

Hyperfine structure constants and isotope shift of the levels of the configuration 4f 6 5d 6s 2 in Eu I

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