Extending the low-Z "border'' of the A=100 region of deformation with precision mass spectrometry of 96-98Kr
Abstract
The onset of collective nuclear behavior in the N=60, A100, region is examined through high-precision mass measurements of 96-98Kr, performed with the ISOLTRAP mass spectrometer at ISOLDE, CERN. Our results for 96-97Kr agree with previous measurements, with our new 97Kr Penning-trap mass value three times more precise. The mass value of 98Kr is measured for the first time. The new mass surface, together with comparisons to beyond-mean-field theoretical predictions, suggests that collectivity persists for the Z=36 isotopes, blurring the apparent ``low-Z boundary'' of this deformed region.
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