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Changes in the mean square charge radii of neutron-deficient europium isotopes measured by the laser ion source resonance ionization spectroscopy
Authors:A.?E.?Barzakh,D.?V.?Fedorov  author-information"  >  author-information__contact u-icon-before"  >  mailto:dfedorov@pnpi.spb.ru"   title="  dfedorov@pnpi.spb.ru"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author,A.?M.?Ionan,V.?S.?Ivanov,F.?V.?Moroz,K.?A.?Mezilev,S.?Yu.?Orlov,V.?N.?Panteleev,Yu?M.?Volkov
Affiliation:(1) Petersburg Nuclear Physics Institute RAS (PNPI), 188300 Gatchina, Leningrad district, Russia
Abstract:The laser ion source has been used for the study of the isotope shifts of neutron-deficient Eu isotopes. The extension of the region of applicability of the method by using the $gamma $- and $beta$-radiation detection is reported. We have measured the isotope shifts of the europium optical line 576.520 nm for $^{137mbox{--}139,141,142m,143,144}{rm Eu}$. To increase the laser ion source efficiency an axial magnetic field (350 gauss) was applied. Nearly a twofold rise of the ionization efficiency for Eu was observed. By using the effect of optical ion bunching an increase of the selectivity was obtained. The isotope shift data for $^{139,141,142m,143,144}{rm Eu}$ are in agreement with the previously measured isotope shifts for these nuclides. The new data for $^{137}{rm Eu}$ and refined data for $^{138}{rm Eu}$ point to a gradual increase of the deformation for these isotopes. Comparisons with microscopic-macroscopic calculations and calculations in the framework of the Hartree-Fock model were performed.Received: 10 November 2003, Revised: 28 April 2004, Published online: 19 October 2004PACS: 29.25.Rm Sources of radioactive nuclei - 42.62.Fi Laser spectroscopy - 21.10.-k Properties of nuclei; nuclear energy levels - 21.10.Ft Charge distribution
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