Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 35, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/35/1/014047
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Low-energy dipole excitations have been investigated theoretically in N = 50 (88)Sr and (90)Zr, several N = 82 isotones and the Z = 50 Sn isotopes. For this purpose a method incorporating both HFB and multi-phonon QPM theory is applied. A concentration of one-phonon dipole strength located below the neutron emission threshold has been calculated in these nuclei. The analysis of the corresponding neutron and proton dipole transition densities allows us to assign a genuine pattern to the low-energy excitations and make them distinct from the conventional GDR modes. Analyzing also the QRPA wave functions of the states we can identify these excitations as pygmy dipole resonance (PDR) modes, recently studied also in Sn and N = 82 nuclei. The results for N = 50 are exploratory for an experimental project designed for the bremsstrahlung facility at the ELBE accelerator.
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