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• W1982464927 abstract "The differences between the excitation energies of isobaric analog states deduced from experimental data have been studied. (i) Isospin inversion is indicated for several nuclei with $N=Z=mathrm{odd}$ up to $A=98$ based on experimental information including the systematics of the above energy differences. It is shown that the related approximate equality of the symmetry and pairing energies also extends to this mass region. A recently reported theoretical description of this behavior seems to involve a complex interplay between isoscalar and isovector pairing. (ii) An expression combining three of these excitation energy differences for nuclei with $Nensuremath{approx}Z$ displays residuals up to 8 MeV in the lightest nuclei only when nuclei with $N=Z$ = odd are included. These residuals appear to be related to a combination of isoscalar and isovector $pensuremath{-}n$ interactions. However, other theoretical interpretations have also been reported. (iii) A ratio of excitation energy differences has been introduced. It provides a signature for shell-model or quartet structures in nuclei with $Nensuremath{approx}Z.$ Shell-model behavior dominates over the entire range of nuclei except for a region in the $mathrm{fp}$ shell with $Aensuremath{approx}70$ to 90 where quartet structure is observed. This result is in agreement with the reported theoretical prediction of a coexistence of $T=0$ and $T=1$ nucleon pairs." @default.
• W1982464927 created "2016-06-24" @default.
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• W1982464927 date "2002-08-30" @default.
• W1982464927 modified "2023-09-25" @default.
• W1982464927 title "Isospin inversion,n−pinteractions, and quartet structures inN=Znuclei" @default.
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• W1982464927 doi "https://doi.org/10.1103/physrevc.66.024327" @default.
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