Microscopic description of the E0, E2 and E1 giant resonances in 40Ca, 48Ca and 56Ni

✍ Scribed by S. Kamerdzhiev; J. Speth; G. Tertychny

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 990 KB
• Volume: 624
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00315-1

✦ Synopsis

The isovector E1 as well as the isoscalar, isovector and full electromagnetic E2 and E0 strength distributions for 4°Ca, 48Ca and 56Ni have been calculated in a large energy range up to 50 MeV of excitation. The microscopic model used includes the continuum RPA, lplh®phonon configurations and ground state correlations induced by these configurations. It is shown that the latter effect gives an increase of the energy weighted sum rules of 4-7%. In all these nuclei the isoscalar E0 and E2 resonances are spread out over the broad energy region. We obtained a reasonable good agreement with the available experimental data including the recent ones for the isoscalar E0 resonance in 4°Ca. The theoretical transition densities show a rather strong dependence on the excitation energy, © 1997 Elsevier Science B.V.