Abstract
Te and Xe isotopes above the shell closure are investigated within a large-scale shell model approach based on an iterative matrix diagonalization algorithm. The spectra and transition strengths, computed using a realistic Hamiltonian, are in overall agreement with the available experimental data. The calculation predicts an increasing neutron weight in the lowest collective state of the isotopes as they depart from the doubly magic Sn and move toward the neutron drip line. Such a neutron dominance is predicted to cause a breaking of the neutron-proton exchange symmetry and a dramatic drop of the strengths of the and transitions among the excited states. This drop establishes a strong asymmetry between Te and Xe isotopes above and below the shell closure.
1 More- Received 19 April 2013
DOI:https://doi.org/10.1103/PhysRevC.88.024303
©2013 American Physical Society