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- W2029049894 abstract "We discuss the formation of $ensuremath{Delta}$ isobars in neutron star matter. We show that their threshold density strictly correlates with the density derivative of the symmetry energy of nuclear matter: the $L$ parameter. By restricting $L$ to the range of values indicated by recent experimental and theoretical analysis, i.e., $40phantom{rule{4.pt}{0ex}}text{MeV}ensuremath{lesssim}Lensuremath{lesssim}62phantom{rule{4.pt}{0ex}}text{MeV}$, we find that $ensuremath{Delta}$ isobars appear at a density of the order of 2 to 3 times the nuclear matter saturation density, i.e., the same range as for the appearance of hyperons. The range of values of the couplings of the $ensuremath{Delta}mathrm{s}$ with the mesons is restricted by the analysis of the data obtained from photoabsorption, electron and pion scattering on nuclei. If the potential of the $ensuremath{Delta}$ in nuclear matter is close to the one indicated by the experimental data then the equation of state becomes soft enough that a ``ensuremath{Delta} puzzle'' exists, similar to the ``hyperon puzzle'' widely discussed in the literature. Possible solutions to this puzzle are also discussed." @default.
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- W2029049894 date "2014-12-29" @default.
- W2029049894 modified "2023-10-12" @default.
- W2029049894 title "Early appearance of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>Δ</mml:mi></mml:math>isobars in neutron stars" @default.
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- W2029049894 doi "https://doi.org/10.1103/physrevc.90.065809" @default.
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