Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1993-04-27
Physics
Nuclear Physics
Nuclear Theory
9 pages text (LaTex) and 3 figures (paper, will be faxed upon request), UI-NTH-9306
Scientific paper
We point out two flaws in the recent test of nucleon-nucleon (NN) potentials conducted by Stoks and de Swart. First, in some cases, the neutron-proton ($np$) version of an NN potential was compared to the proton-proton ($pp$) data, which is improper and yields (large) $\chi^2$ that are essentially meaningless. Second, for a proper test of the quantitative nature of a NN potential, it is insufficient to compare to $pp$ data only, since this leaves the T=0 potential untested. Thus, it can happen that the $pp$ version of a potential predicts the $pp$ data accurately, while the $np$ version of that same potential is poor in $np$ (where also the T=0 potential is involved). An example for this is the Nijmegen potential, which predicts the $pp$ data well with a $\chi^2$/datum of 2.0, but yields a $\chi^2$/datum of 6.5 in $np$.
Li Gu-Qiang
Machleidt Ruprecht
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