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Resonant photon scattering on the semi-magic nucleus 89Y up to 7 MeV* Account Nr.: 00269871Reif, J.; von Brentano, P.; Eberth, J.; Enders, J.; Herzberg, R.-D.; Huxel, N.; Käubler, L.; von Neumann-Cosel, P.; Nicolay, N.; Pietralla, N.; Prade, H.; Richter, A.; Schlegel, C.; Schnare, H.; Schwengner, R.; Servene, T.; Skoda, S.; Thomas, H. G.; Wiedenhöver, I.; Winter, G.; Zilges, A.
The semi-magic nucleus 89Y has been investigated in a (gamma,gamma')
experiment at an endpoint energy of the bremsstrahlung of E0=
7 MeV. The scattered photons have been detected with a EUROBALL Cluster
detector. The observed excitations are discussed in the framework of the
shell model and a coupling of the unpaired proton to milti-phonon structures
in the doubly even neighbours. Transitions above 4.7 MeV are considered
to have E1 character. Around 6.3 MeV an unusually large concentration of
E1 strength is found. Its origin is likely to correspond to similar structures
in the 88Sr and 90Zr isotones which can be interpreted
to result from the constructive interference of strong two-phonon amplitudes
with weak admixtures from the low-energy tail of the giant dipole resonance.
- Nuclear Physics A 620 (1997) 1-15
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