Results 1 - 10 of 37153
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[en] The macroscopic model of pairing deformation proposed by Dasso and Vitturi is used to study the variation with neutron number of the radius of spherical nuclei. It is shown that the shape of the variations is reproduced, but that the effects of pairing are too small to describe the data. (orig.)
[en] Collective excitation modes in neutron rich nuclei contain valuable information about the isospin dependence of the nuclear equation of state (EOS). A key observable in this regard is the dipole polarizability, a quantity shown be strongly related to the EOS slope parameter L. To this purpose an experimental campaign aimed at measuring the dipole response of the neutron rich side of the tin isotopic chain (124-132Sn) has been conducted at GSI Helmholtzzentrum fuer Schwerionenforschung. The method used was relativistic Coulomb scattering in inverse kinematics. The present status of the analysis is presented.
[en] The isotope shift and hyperfine structure of the optical Sn I resonance transition 5p23P0->5p6s 3P1 at lambda=286.3 nm have been studied for 18 Sn nuclei including 2 isomers. Laser induced resonance fluorescence from a collimated atomic beam of tin was observed using a tunable cw dye laser with frequency doubler. The electromagnetic nuclear moments and changes of the mean square charge radii of the nuclear charge distributions were determined. The results are discussed with respect to the information they provide on the nuclear structure of the nuclei investigated; they are compared with various theoretical models. (orig.)
[de]Die Isotopieverschiebung und die Hyperfeinaufspaltung des optischen Sn I-Ueberganges 5p23P0->5p6s 3P1 bei lambda=286.3 nm wurden fuer 18 Zinnkerne, darunter 2 Isomere, untersucht. Dazu wurde die laserinduzierte Fluoreszenz an einem kollimierten Atomstrahl beobachtet; als Lichtquelle wurde ein durchtimmbarer Dauerstrich-Farbstofflaser mit Frequenzverdoppler verwendet. Es wurden die elektromagnetischen Kernmomente und die Aenderungen der mittleren quadratischen Ladungsradien der Kernladungsverteilung bestimmt. Die Ergebnisse werden im Hinblick auf die Kernstruktur der untersuchten Atomkerne diskutiert und mit verschiedenen theoretischen Modellen verglichen. (orig.)
[en] The tin isotopes have a magic proton number (Z=50) and the most stable isotopes of all elements. Therefore tin has always been a key element in the understanding of nuclear theory. Laser spectroscopy measurements have been performed previously with low resolution up to the doubly magic nucleus 132Sn. To extract magnetic dipole and electric quadrupole moments, these measurements have now been repeated using high-resolution laser spectroscopy at the COLLAPS beam line at ISOLDE, CERN. Furthermore, isomers along the chain from 113m-131mSn have been investigated and the data is extended up to 134Sn allowing the investigation of the strength of the characteristic kink at N=82. In the elements above tin a clear change in the slope is observed in the mean square charge radius when crossing the magic neutron number N = 82. It is, however, weaker for tellurium (Z=52) than in xenon (Z=54). Hartree-Fock-Bogoliubov calculations have recently been performed confirming this behaviour and predicting such a kink in the nuclear charge radii also for the tin isotopes. The nuclear charge radii as well as the isomer shifts are presented.