Discovery of Rn229 and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements
The masses of the neutron-rich radon isotopes Rn223-229 have been determined for the first time, using the ISOLTRAP setup at CERN ISOLDE. In addition, this experiment marks the first discovery of a new nuclide, Rn229, by Penning-trap mass measurement. The new, high-accuracy data allow a fine examination of the mass surface, via the valence-nucleon interaction δVpn. The results reveal intriguing behavior, possibly reflecting either a N=134 subshell closure or an octupolar deformation in this region.
Physical Review Letters
- Pub Date:
- March 2009
- Binding energies and masses;
- Forces in hadronic systems and effective interactions;
- Atomic masses mass spectra abundances and isotopes