Fragmentation of spindipole strength in ^{90}Zr and ^{208}Pb
Abstract
An extension of timedependent covariant density functional theory that includes particlevibration coupling is applied to the chargeexchange channel. Spindipole excitation spectra are calculated an compared to available data for ^{90}Zr and ^{208}Pb. A significant fragmentation is found for all three angularmomentum components of the spindipole strength as a result of particlevibration coupling, as well as a shift of a portion of the strength to higher energy. A highenergy tail is formed in the strength distribution that linearly decreases with energy. Using a modelindependent sum rule, the corresponding neutron skin thickness is estimated and shown to be consistent with values obtained at the meanfield level.
 Publication:

Physics Letters B
 Pub Date:
 January 2012
 DOI:
 10.1016/j.physletb.2011.11.050
 arXiv:
 arXiv:1204.6260
 Bibcode:
 2012PhLB..706..477M
 Keywords:

 Covariant density functional theory;
 Particle─vibration coupling;
 Nuclear chargeexchange excitations;
 Particlevibration coupling;
 Nuclear Theory;
 Nuclear Experiment
 EPrint:
 15 pages, 3 figures