Evolution of the pygmy dipole resonance in nuclei with neutron excess

Details Evolution of the pygmy dipole resonance in nuclei with neutron excess Evolution of the pygmy dipole resonance in nuclei with neutron excess

2009-06-25

arxiv.org/abs/0906.4630v1

Phys.Rev.C80:014308,2009

Physics

Nuclear Physics

Nuclear Theory

14 pages, 12 figures, 7 tables

Scientific paper

10.1103/PhysRevC.80.014308

The electric dipole excitation of various nuclei is calculated with a Random Phase Approximation phenomenological approach. The evolution of the strength distribution in various groups of isotopes, oxygen, calcium, zirconium and tin, is studied. The neutron excess produces $E1$ strength in the low energy region. Indexes to measure the collectivity of the excitation are defined. We studied the behavior of proton and neutron transition densities to determine the isoscalar or isovector nature of the excitation. We observed that in medium-heavy nuclei the low-energy $E1$ excitation has characteristics rather different that those exhibited by the giant dipole resonance. This new type of excitation can be identified as pygmy dipole resonance.

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