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Microscopic calculation of the electromagnetic dipole strength for 239,243 Pu isotopes

This work investigates the electric and magnetic dipole ( E 1 and M 1) responses for 239,243 Pu isotopes based on the quasiparticle phonon nuclear model, which was complemented by adding, for the first time, residual interactions for addressing the violations of rotational, translational, and Galile...

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Published in:Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2023-01, Vol.50 (1), p.15104
Main Authors: Yakut, H, Tabar, E, Kemah, E, Hoşgör, G
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Language:English
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Tabar, E
Kemah, E
Hoşgör, G
description This work investigates the electric and magnetic dipole ( E 1 and M 1) responses for 239,243 Pu isotopes based on the quasiparticle phonon nuclear model, which was complemented by adding, for the first time, residual interactions for addressing the violations of rotational, translational, and Galilean symmetries caused by the mean-field approach. We focus on the E 1 and M 1 dipole strengths and photoabsorption cross sections up to 20 MeV, with the results revealing that the giant dipole resonance best describes the experimental trend with a ratio of 95%. It appears that most of the E 1 strength is found at E x  = 8–20 MeV, but the total B ( E 1)↑ strength for the pygmy dipole resonance at E x  = 4–8 MeV accounts for some 1.83 e 2 fm 2 , which in turn corresponds to 2% of the Thomas–Reiche–Kuhn sum rule. Furthermore, the resultant total B ( M 1)↑ value for the scissors mode strength below 4 MeV is 5.65 μ N 2 , which is below that of the Oslo data (10.1(15) μ N 2 ). However, the theoretically predicted scissors resonance structure has two peaks in the 1–3.5 MeV energy range, so it exhibits a similar trend to that found in the Oslo data.
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We focus on the E 1 and M 1 dipole strengths and photoabsorption cross sections up to 20 MeV, with the results revealing that the giant dipole resonance best describes the experimental trend with a ratio of 95%. It appears that most of the E 1 strength is found at E x  = 8–20 MeV, but the total B ( E 1)↑ strength for the pygmy dipole resonance at E x  = 4–8 MeV accounts for some 1.83 e 2 fm 2 , which in turn corresponds to 2% of the Thomas–Reiche–Kuhn sum rule. Furthermore, the resultant total B ( M 1)↑ value for the scissors mode strength below 4 MeV is 5.65 μ N 2 , which is below that of the Oslo data (10.1(15) μ N 2 ). 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title Microscopic calculation of the electromagnetic dipole strength for 239,243 Pu isotopes
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