The direct γ decays of the giant dipole resonance (GDR) and the giant quadrupole resonance (GQR) of Pb208 to low-lying states are investigated by means of a microscopic self-consistent model. The model considers effects beyond the linear response approximation. The experimental γ-decay widths from GQR to the first 3- state and the low-lying dipole states are well reproduced with the Skyrme interaction SkP. The strong sensitivity of γ decay to the isospin of the involved states is proven. By comparing the decay widths between GDR to 21+ and GQR to 31-, a much larger weight of the 31- component in the GQR wave function of Pb208 is deduced, with respect to the weight of the 21+ component in the GDR wave function. Thus, we have shown that γ decay is a unique probe of the resonance wave functions, and a test ground for nuclear structure models.

Learning about the structure of giant resonances from their γ decay / W.L. Lv, Y.F. Niu, G. Colo'. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 103:6(2021), pp. 064321.1-064321.8. [10.1103/PhysRevC.103.064321]

Learning about the structure of giant resonances from their γ decay

G. Colo'
2021

Abstract

The direct γ decays of the giant dipole resonance (GDR) and the giant quadrupole resonance (GQR) of Pb208 to low-lying states are investigated by means of a microscopic self-consistent model. The model considers effects beyond the linear response approximation. The experimental γ-decay widths from GQR to the first 3- state and the low-lying dipole states are well reproduced with the Skyrme interaction SkP. The strong sensitivity of γ decay to the isospin of the involved states is proven. By comparing the decay widths between GDR to 21+ and GQR to 31-, a much larger weight of the 31- component in the GQR wave function of Pb208 is deduced, with respect to the weight of the 21+ component in the GDR wave function. Thus, we have shown that γ decay is a unique probe of the resonance wave functions, and a test ground for nuclear structure models.
Settore FIS/04 - Fisica Nucleare e Subnucleare
European Nuclear Science and Application Research 2
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/870336
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