Abstract
Intermediate energy Coulomb excitation at 100 MeV/nucleon was used to probe the low-lying level structure of both and in the region between 1 and 8 MeV. Discrete states with energies of 5.35(10) and 6.85(5) MeV were observed in The strong direct excitation and subsequent -ray decay of these states, along with predictions for levels in this energy region, established their dipole character. The extracted values of and for the 5.35- and 6.85-MeV states, respectively, are significantly larger than shell model calculations, though modification of the single-particle energies, in particular, the shell gap, improves the agreement. The summed value for these levels (in Weisskopf units) is consistent with that for other nuclei that have been discussed recently in the literature as potential Pygmy dipole resonance hosts.
- Received 27 February 2003
DOI:https://doi.org/10.1103/PhysRevC.67.064309
©2003 American Physical Society