Abstract
Gamma-ray transitions have been identified for the first time in the extremely neutron-deficient () nucleus , and the energies of the three lowest excited states in the ground-state band have been deduced. The results establish a breaking of the normal trend of increasing first excited and level energies as a function of the decreasing neutron number as the major shell gap is approached for the neutron-deficient Xe isotopes. This unusual feature is suggested to be an effect of enhanced collectivity, possibly arising from isoscalar interactions becoming increasingly important close to the line.
- Received 30 January 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.022501
©2007 American Physical Society