Elsevier

Nuclear Physics A

Volume 483, Issue 2, 20 June 1988, Pages 244-268
Nuclear Physics A

Mean square charge radii of radium isotopes and octupole deformation in the 220–228Ra region

https://doi.org/10.1016/0375-9474(88)90534-9Get rights and content

Abstract

The first investigation of isotope shifts in both the atomic and ionic resonance lines of radium has been carried out using the technique of on-line collinear fast-beam laser spectroscopy at the ISOLDE facility at CERN. The measurements cover 19 isotopes in the mass range 208⩽A⩽232 with half-lives between 23 ms and 1600 y. The differences in the nuclear mean square charge radii δr2〉 have been evaluated and - together with earlier published spins and moments from the hyperfine structure - related to nuclear deformation. In particular the inversion of the odd-even staggering effect for the isotopes 221Ra, 223Ra and 225Ra can be interpreted by the presence of octupole instability and adds weight to the concept of near-stable octupole deformation in the odd-A isotopes which already explained their spins and magnetic moments.

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    Present address: Bhabha Atomic Research Centre, Bombay-400 005, India.

    ★★

    Present address:Physikalisch-Technische Bundesanstalt,Institut Berlin, D-1000 Berlin 10,Germany

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