Nature of low-lying electric dipole resonance exditations in 74Ge

Nature of low-lying electric dipole resonance exditations in 74Ge

Negi, D.; Wiedeking, M.; Lanza, E. G.; Litvinova, E.; Vitturi, A.; Bark, R. A.; Bernstein, L. A.; Bleuel, D. L.; Bvumbi, S.; Bucher, T. D.; Daub, B. H.; Dinoko, T. S.; Erasmus, N.; Easton, J. L.; Görgen, A.; Guttormsen, M.; Jones, P.; Kheswa, B. V.; Khumalo, N. A.; Larsen, A. C.; Lawrie, E. A.; Lawrie, J. J.; Majola, S. N. T.; Masiteng, L. P.; Nchodu, M. R.; Ndayishimye, J.; Newman, R. T.; Noncolela, S. P.; Orce, J. N.; Papka, P.; Pellegri, L.; Renstrom, T.; Roux, D. G.; Schwengner, R.; Shirinda, O.; Siem, S.; Sithole, P. S.; Uwitonze, P. C.

Abstract

Isospin properties of dipole states in 74Ge are investigated using the (alpha,alpha') reaction and compared to (gamma,gamma') data. The results indicate that the dipole states in the excitation energy region of 6 to 8 MeV adhere to the scenario of the recently found splitting of the region of dipole states into two separated parts: one at low energy being populated by both isoscalar and isovector probes and the other at high energy excited only by the electromagnetic probe. RQTBA calculations show a reduction in the isoscalar E1 strength with an increase in excitation energy which is consistent with the measurement.

Keywords: Alpha-particle scattering; cross sections; E1 strength; RQTBA calculations

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