Abstract
We describe electromagnetic and -decay transitions to low-lying excited states in even-even nuclei within the coherent state model (CSM). We reproduced the energies and values for ground state bands in 40 daughter nuclei with known -branching ratios to states. To this purpose we used two parameters, namely the deformation parameter and the strength of the harmonic CSM Hamiltonian. The Hamiltonian describing the -emission process is given by two terms. The first term describes the dynamics of the daughter nucleus. The second -daughter component contains the monopole potential, estimated within the double folding procedure with M3Y interaction plus a repulsive core simulating Pauli principle and a quadrupole-quadrupole (QQ) interaction. The decaying states are identified with the lowest narrow outgoing resonances in this potential. The -branching ratios to states were reproduced by using the QQ strength depending linearly on the deformation parameter, as predicted by CSM. The theoretical intensities to and states are in a reasonable agreement with available experimental data. We found out that the QQ coupling strength is by one order of magnitude larger in the region above Pb, where the clustering is known to be stronger, in comparison to other nuclei. This formalism is able to simultaneously describe electromagnetic and decays to excited states in spherical, transitional, and well deformed nuclei.
3 More- Received 14 February 2013
DOI:https://doi.org/10.1103/PhysRevC.87.044314
©2013 American Physical Society