Isospin properties of dipole excitations in Ge-74 are investigated using the (alpha,alpha'gamma) reaction and compared to (gamma,gamma') data. The results indicate that the dipole excitations in the energy region of 6 to 9MeV adhere to the scenario of the recently found splitting of the region of dipole excitations 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. Relativistic quasiparticle time blocking approximation (RQTBA) calculations show a reduction in the isoscalar E1 strength with an increase in excitation energy, which is consistent with the measurement.
Nature of low-lying electric dipole resonance excitations in Ge 74
VITTURI, ANDREA;
2016
Abstract
Isospin properties of dipole excitations in Ge-74 are investigated using the (alpha,alpha'gamma) reaction and compared to (gamma,gamma') data. The results indicate that the dipole excitations in the energy region of 6 to 9MeV adhere to the scenario of the recently found splitting of the region of dipole excitations 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. Relativistic quasiparticle time blocking approximation (RQTBA) calculations show a reduction in the isoscalar E1 strength with an increase in excitation energy, which is consistent with the measurement.Pubblicazioni consigliate
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