In studies of neutron-proton pairing the empirical evaluations based on nuclear masses are of particular importance. In the current work, various mass relations are analysed by the example of N=Z nuclei and essentially different formulas used for estimation of np-pairing energy in self-conjugate nuclei are shown to yield similar results. Correlations between the obtained values and the spectra of isobaric analogous states indicate that mass relations may be used to describe the isovector (T=1) component of np-pairing to sufficient accuracy, providing however little or no information regarding the isoscalar component T=0.
21.30.Fe Forces in hadronic systems and effective interactions
29.87.+g Nuclear data compilation
$^1$Physical faculty of Lomonosov Moscow State University\
$^2$Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University
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