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

Isospin properties of dipole excitations in 74 Ge are investigated using the (α , α ′ γ ) reaction and compared to (γ , γ ′ ) data. The results indicate that the dipole excitations in the energy region of 6 to 9 MeV adhere to the scenario of the recently found splitting of the region of dipole excit...

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Bibliographic Details
Published in:	Physical review. C, Nuclear physics
Main Authors:	Negi, D, Wiedeking, M, Lanza, EG, Litvinova, E, Vitturi, A, Bark, RA, Bernstein, LA, Bleuel, DL, Bvumbi, S, Bucher, TD, Daub, BH, Dinoko, TS, Easton, JL, Görgen, Andreas, Guttormsen, Magne Sveen, Jones, P, Kheswa, BV, Khumalo, NA, Larsen, Ann-Cecilie, Lawrie, EA, Lawrie, JJ, Majola, SNT, Masiteng, LP, Nchodu, MR, Ndayishimye, J, Newman, RT, Noncolela, SP, Orce, JN, Papka, P, Pellegri, L, Renstrøm, Therese, Roux, DG, Schwengner, R, Shirinda, O, Siem, Sunniva
Format:	Journal Article
Language:	English
Published:	American Physical Society 23-08-2016
Online Access:	Get full text
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Summary:	Isospin properties of dipole excitations in 74 Ge are investigated using the (α , α ′ γ ) reaction and compared to (γ , γ ′ ) data. The results indicate that the dipole excitations in the energy region of 6 to 9 MeV 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.
ISSN:	0556-2813 1089-490X
DOI:	10.1103/PhysRevC.94.024332