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Preprints, Working Papers, ... Year : 2017

Axial-Vector Coupling Constant in Nuclei and Dense Matter

Abstract

The in-medium property of the axial-vector coupling constant $g_A$ in nuclei and dense baryonic matter is reformulated in terms of the recently constructed scale-invariant hidden local symmetric ($bs$HLS) Lagrangian. It is shown that unlike the pion decay constant that slides with the vacuum change induced by density, the axial-current constant $g_A$ remains unmodified up to high density relevant to compact stars in nuclear Gamow-Teller transitions (involving the space component of the axial current) whereas it gets strongly enhanced in axial-charge transitions (involving the time component of the axial current) as density nears nuclear matter density $n_0$ and stays more or less constant up to $\sim 6n_0$. The implications of these predictions on giant Gamow-Teller resonances in nuclei and on first-forbidden beta transitions (relevant to nuclear astrophysical processes) are discussed.
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cea-01562873 , version 1 (17-07-2017)

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Mannque Rho. Axial-Vector Coupling Constant in Nuclei and Dense Matter. 2017. ⟨cea-01562873⟩
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