The Gamow-Teller States in Relativistic Nuclear Models

Abstract

The Gamow-Teller(GT) states are investigated in relativistic models. The Landau-Migdal(LM) parameter is introduced in the Lagrangian as a contact term with the pseudo-vector coupling. In the relativistic model the total GT strength in the nucleon space is quenched by about 12% in nuclear matter and by about 6% in finite nuclei, compared with the one of the Ikeda-Fujii-Fujita sum rule. The quenched amount is taken by nucleon-antinucleon excitations in the time-like region. Because of the quenching, the relativistic model requires a larger value of the LM parameter than non-relativistic models in describing the excitation energy of the GT state. The Pauli blocking terms are not important for the description of the GT states.

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References in corpus (8)

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• Dilepton Production in Nucleon-Nucleon Interactions
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• Delta-Hole Interaction in Nuclei and the Gamow-Teller Strength in ^90Nb
• Relativistic treatment of spin-transfer observables in quasielastic $(\vec{\mathbf{p}},\vec{\mathbf{n}})$ scattering
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• Effects of the Dirac Sea on the Giant Monopole States
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• Temperature dependence of nuclear spin-isospin response and beta decay in hot astrophysical environments
• Nuclear charge-exchange excitations based on relativistic density-dependent point-coupling model
• The Energy-Weighted and Non Energy-Weighted Gamow-Teller Sum Rules in Relativistic Random Phase Approximation
• Gamow-Teller sum rule in relativistic nuclear models