Isotope shift and nuclear deformations

Meligy, A. S.; Tadros, S.; El-Wahab, M.A.

doi:10.1016/s0029-5582(60)81059-0

Cited by 12 publications

(2 citation statements)

References 18 publications

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“…[14][15][16][17][18][19][20] According to Ionesco-Pallas, 19 the following equation holds for a given element, between isotopes differing by two neutrons :…”

Section: Discussionmentioning

confidence: 99%

Isotope Shift in the Spectrum of Erbium I

Haynes

Ross

1965

Phys. Rev.

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Using enriched samples, the isotope shift in seven lines of the arc spectrum of erbium was measured with a Fabry-Perot interferometer. The average relative isotope shift for the even isotopic pairs Av (170-168): Av(168-166):A^(166-164):A^(164-162) was found to be 1.00:0.96±0.02:0.94=b0.03:1.23±0.04, showing a large change in nuclear deformation between the isotopes with neutron numbers 96 and 94. This results in a predicted intrinsic quadrupole moment for Er 162 of 6.30=b0.30 b. No pronounced even-odd staggering was observed for the odd isotope Er 167 , since the average value for Av (168-166) :Av (168-167cg) was found tobel.00:0.52±0.03.

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“…[14][15][16][17][18][19][20] According to Ionesco-Pallas, 19 the following equation holds for a given element, between isotopes differing by two neutrons :…”

Section: Discussionmentioning

confidence: 99%

Isotope Shift in the Spectrum of Erbium I

Haynes

Ross

1965

Phys. Rev.

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“…Despite the improvement, however, the fact that this does not remove the discrepancy completely is accepted by most workers in the field. Meligy (1959) and Meligy et al (1960) are the only authors who have claimed otherwise ; they made use of the scattering data to evaluate the constants necessary to specify the trapezoidal distribution, and concluded that pel did not depart significantly from unity. Bodmer (1960) showed that the difference between his and Meligy's conclusions could be due only to their use of different interpretations of the scattering data, since Bodmer's general expression for the isotope shift reduced to Meligy's for the trapezoidal case.…”

Section: General Trends and Comparisons With Other Workmentioning

confidence: 99%

Isotope shifts and nuclear charge distributions

Stacey

1966

Rep. Prog. Phys.

105

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This report is concerned with the measurement and interpretation of the field-dependent isotope shifts in atomic spectra, i.e. shifts due to variations in the nuclear charge distribution. Mass effects are considered only in order to extract the field-dependent shifts from the measured shifts.After a review of experimental techniques and a summary of the basic theory, the isotope shift results are discussed in terms of the results of other experimental investigations of nuclear charge distributions. There are two striking features of isotope shift results for even-even nuclei, their overall smallness and their irregular variation with neutron number over the range of isotopes of an element. T h e first of these has not yet been satisfactorily accounted for. The irregularities are associated with neutron shell structure, but they cannot be attributed entirely to deformation effects.Experimental isotope shifts and nuclear deformations are tabulated.Recent work on the odd-even staggering effect is reviewed.

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Theory of Isotope Shifts in Heavy Atoms

Ionesco-Pallas

1961

Annalen der Physik

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A general theory is given for the isotope shift of energy levels in heavy atoms. The methods used here are based neither on the simple perturbation theory nor on the solution of the D a r w i n -G o r d o n differential epuations for the region inside the nucleus. It is sufficient t o solve an integral equation from which result both the distortion effect of the wave function due to the spatial extension of the nucleus, and the specific nuclear effects of surface and deformation.The screening effects of the electrons in the closed shells, the effect of nuclear compressibility as well as other effects ar also analyzed.The article probably exhausts the main causes which account for the global effect of isotope shift. The values obtained theoretically for the isotopic constants of the nuclei, fairly well agree with the experimental ones. IntroductionThe isotope shift of the energy levels of heavy atoms has been attributed by B r e i t l ) t o the distribution of the nuclear charge in a small spherical volume

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Isotope shift and nuclear deformations

Cited by 12 publications

References 18 publications

Isotope Shift in the Spectrum of Erbium I

Isotope Shift in the Spectrum of Erbium I

Isotope shifts and nuclear charge distributions

Theory of Isotope Shifts in Heavy Atoms

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