Abstract
We report on the first -ray spectroscopy of low-lying states in neutron-rich isotopes obtained from reactions at . A reduction of the state energies beyond demonstrates a significant increase of deformation, shifted in neutron number compared to the sharper transition observed in strontium and zirconium isotopes. State-of-the-art beyond-mean-field calculations using the Gogny D1S interaction predict level energies in good agreement with experimental results. The identification of a low-lying (, ) state in provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblate-prolate shape coexistence picture suggested by theory.
- Received 22 February 2017
DOI:https://doi.org/10.1103/PhysRevLett.118.242501
© 2017 American Physical Society