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Measurement of the Dipole and Electric Quadrupole Strength Distributions up to 10 MeV in the Doubly Magic Nuclei 40 Ca and 48 Ca</mml:mi…

2000; American Physical Society; Volume: 85; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.85.274

1092-0145

T. Hartmann, J. Enders, P. Mohr, K. Vogt, S. Volz, A. Zilges,

Nuclear Physics and Applications

The doubly magic nuclei 40Ca and 48Ca have been studied in high resolution photon scattering experiments. We have derived absolute dipole and quadrupole excitation strengths up to 10 MeV. Evidence was found for a two-phonon quadrupole-octupole state in 48Ca. At higher energies in contrast to 40Ca, a concentration of dipole strength is observed in 48Ca which is discussed in terms of a pygmy resonance originating from the large neutron excess.