HAL CCSD
Axial-Vector Coupling Constant in Nuclei and Dense Matter
Rho, Mannque
Institut de Physique Théorique - UMR CNRS 3681 (IPHT) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
1 figure
cea-01562873
https://cea.hal.science/cea-01562873
https://cea.hal.science/cea-01562873/document
https://cea.hal.science/cea-01562873/file/1705.10864.pdf
https://cea.hal.science/cea-01562873
2017
ARXIV: 1705.10864
info:eu-repo/semantics/altIdentifier/arxiv/1705.10864
en
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
info:eu-repo/semantics/preprint
Preprints, Working Papers, ...
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.
2017-07-17
info:eu-repo/semantics/OpenAccess