Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk10008o&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
A comprehensive study of the excitation energy differences between isobaric analog states, i.e. between the energetically lowest states of given isospins, has been undertaken. Symmetry and pairing energies were obtained globally for all known atomic nuclei and compared to results from several mass predictions. Pronounced shell effects are observed. Special attention is given to nuclei with N ≈ Z. For A>26 symmetry and pairing energies are approximately equal. Therefore, isospin inversion is observed and predicted for numerous self-conjugate nuclei with N=Z=odd up to A=98. Energy relations [1,2] for the above energy differences provide information about T=1 and T=0 n-p interactions in support of results from theoretical work and in accordance with the isospin-independent part of the Wigner energy. Furthermore, quartet structures become evident for N=Z nuclei in the region A=76-96 as predicted theoretically. One of the authors (TWO'D) had partial support from NSF Grant PHY9804878. [1] J. Jänecke, Chapter 8 in Isospin in Nuclear Physics, ed. D.H. Wilkinson (North Holland) p. 298. [2] J. Jänecke, T.W. O'Donnell, and V.I. Goldanskii, to be published.
Goldanskii Vitalii I.
Janecke J.
O'Donnell Thomas Wilfred
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