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- W2015429246 abstract "Abstract Spin-isospin mode β-and γ- transitions with Δ l =1 between low-lying single particle states in medium heavy nuclei are shown to be quenched uniformly by factors 34 in comparison with shell model calculations without coherent effects of spin-isospin polarizations. The quenching factors are analyzed, in terms of the nucleon mode NN −1 spin isospin polarization and the higher excitation XN −1 mode spin-isospin polarization. The RPA is used for the separable particle-hole polarization interaction. The observed values of the quenching factor g eff /g for the single particle spin-isospin transition and of the excitation energy E GR for the relevant spin-isospin giant resonance are represented n terms of the NN −1 polarization strength and the XN −1 mode one. The nucleon NN −1 polarization strength f τ ≈ 1.15 reproduces both the IAS-Elγ quenching factors and the Elγ giant resonance energies, while the spin isospin mode requires a finite contribution of the higher mode strength of h τσ ≈0.4 in addition to the MN mode strength of f τσ ≈1.35 to explain both the quenching factor of the single particle transition rate and. the τσ Y 1 , giant resonance energy observed in (p, n) reactions. The strong spin isospin mode at high excitation region is discussed in terms of the isobar (Δ) N −1 effect and the tensor interaction effect." @default.
- W2015429246 created "2016-06-24" @default.
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- W2015429246 date "1983-03-01" @default.
- W2015429246 modified "2023-10-01" @default.
- W2015429246 title "Quenching of single particle spin-isospin operators with δℓ=1 and higher multipoles in medium heavy nuclei" @default.
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- W2015429246 doi "https://doi.org/10.1016/0375-9474(83)90018-0" @default.
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