No abstract available

[en] Recently, isotope shifts of ^72,74-96Kr and ^77-100Sr have been measured at the ISOLDE/CERN mass separator facility by collinear laser spectroscopy. The deduced changes in mean-square charge radii reveal sharp transitions in nuclear shape from spherical near the magic neutron number N 50 towards strongly deformed for both the neutron-deficient and neutron-rich isotopes far from stability. The mean-square charge radii of the neutron-deficient isotopes exhibit a sign change of the odd-even staggering (OES), i.e. below the neutron number N = 46 the radius is systematically larger for the odd-N nuclei than for their ever-N neighbours. This is in contrast to the situation of normal OES which is observed for the heavier isotopes. The inversion of the OES is interpreted as an effect of polarization, triggered by the addition of an unpaired neutron and driving the soft even-even core into stable strong deformation. (orig.)

[en] From reported experimental values of Moessbauer isomer shifts the change in nuclear mean-square charge radius, delta(r²), upon excitation was extracted, using electron densities calculated through a Dirac-Fock-Slater routine. Application of a uniform scheme of evaluation should give better insight in systematic trends of delta(r²). Also reported are generally more accurate ratios of delta(r²) either for different resonances in one element or for resonances in chemically similar elements. The literature has been surveyed through June 1973. (U.S.)

[en] A formula for the nuclear mean-square charge radii is deduced from the combined analysis of the experimental data on electron scattering, mesonic X-ray measurements, isotope shifts in the optic and X-ray spectra of atoms as well as from the Coulomb energy differencies of isomultiplets. It contains not only a smooth dependence on A and Z, but also local shell-parity corrections. The formula provides the description of the nuclear sizes with the maximal deviation (3-5)x10^-2 Fm

[en] Aspects of the three-parameter Fermi distribution of charge type and density are calculated. The integrals, and mean quadratic and mean quartic radii of charge density distribution are calculalated. (author)

No abstract available

[en] A least-squares method for the combined analysis of two types of experimental data on nuclear charge radii has been developed. The data types are (1) radii measured from electron scattering and muonic atomic spectra and (2) radii changes determined from optical isotope shifts. The nuclear charge radii systematics thus derived exhibit the following essential features: (i) the independently measured radii for the individual isotopes of an element are additionally constrained by the high accuracy of the extended isotopic chain of radii change values, (ii) unknown nuclear radii values are predicted for many isotopes of that element, and (iii) the accuracy of the fitted nuclear radii values is higher than that of the original independently measured values. The table presents a new set of nuclear radii systematics for 42 elements from ₁₁Na to ₉₅Am. These are elements for which there exist both types of experimental data. The range of isotopic numbers covered is determined by the range of the second type of data available. 56 refs., 2 figs., 2 tabs

No abstract available

No abstract available

[en] The main results of the present work are the formulae: √ < r²> = 0,93Asup(1/3) + 0,2 and r₁ = 1,16Asup(1/3) + 0,258, where √ < r²> and r₁ are the mean-root-square and the equivalent nuclear radii, respectively, as the functions of the mass number A. This result is obtained from the experimental data for the electron-nucleus scattering in the framework of the model of Ch.Dimitrov and I.Petkov. As a consequence of this result a number of parameters of the nuclear matter are renormalized: the nucleon volume becomes 4π/3(1,16+0,258/Asup(1/3))³, the average distance between nucleons becomes 1,87f, the equilibrium density becomes 0,15f^-3, the energy of the nucleon becomes 22 Mev. The last circumstance leads to the change of the coefficients in the Weizsaecker formula. The connection of the obtained results with the Brueckner method is studied. (S.P.)