Study of the neutron deficient 182–190Pb isotopes by simultaneous atomic- and nuclear-spectroscopy

Author: Seliverstov M.   Andreyev A.   Barré N.   Witte H.   Fedorov D.   Fedoseyev V.   Franchoo S.   Genevey J.   Huber G.   Huyse M.   Köster U.   Kunz P.   Lesher S.   Marsh B.   Roussière B.   Sauvage J.   Duppen P.   Volkov Yu.  

Publisher: Springer Publishing Company

ISSN: 0304-3843

Source: Hyperfine Interactions, Vol.171, Iss.1-3, 2006-07, pp. : 225-231

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Abstract

Mean-square charge radii and magnetic moments have been measured for the neutron deficient lead isotopes, 182–190Pb. The measurement was performed at the ISOLDE online mass separator, using the in-source resonance ionization spectroscopy technique. The wavelength of the first excitation step for the resonance ionization laser ion source (RILIS) was scanned over the resonance(s) whilst the α- and γ-ray spectra from the decay of the Pb isotopes were recorded as a function of the wavelength. The isotope shift and, in the case of odd-A isotopes, the hyperfine splitting were deduced. The rms-charge radii of the very neutron deficient Pb isotopes follow the smooth trend of the heavier isotopes. This finding indicates a spherical shape for the lead ground states at the neutron mid-shell (N = 104), where the excitation energy of the oblate 0+ state in the even isotopes reaches its minimum.

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