Changes in the mean square charge radii of neutron-deficient europium isotopes measured by the laser ion source resonance ionization spectroscopy
| Autor: | F. V. Moroz, S. Yu. Orlov, A. M. Ionan, V. S. Ivanov, Yu. M. Volkov, V. N. Panteleev, A. E. Barzakh, D. V. Fedorov, K. A. Mezilev |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | The European Physical Journal A. 22:69-74 |
| ISSN: | 1434-601X 1434-6001 |
| DOI: | 10.1140/epja/i2003-10231-y |
| Popis: | 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 $^{137\mbox{--}139,141,142m,143,144}{\rm Eu}$ . 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. |
| Databáze: | OpenAIRE |
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