Abstract
Differential cross sections have been measured for ($p, n$) reactions to the isobaric analogs of the targets $^{48}\mathrm{Ca}$, $^{90}\mathrm{Zr}$, $^{120}\mathrm{Sn}$, and $^{208}\mathrm{Pb}$ at proton bombarding energies of 25, 35, and 45 MeV. The isospin-flip strength of a phenomenological nucleon-nucleon force has been determined with microscopic distorted-wave calculations including the knock-on exchange amplitude. A realistic $G$-matrix effective interaction also provides a reasonable account of the observed cross sections, particularly at the higher proton energies.NUCLEAR REACTIONS $^{48}\mathrm{Ca}$, $^{90}\mathrm{Zr}$, $^{120}\mathrm{Sn}$, $^{208}\mathrm{Pb}(p, n)$, $E=25, 35, 45$ MeV; measured IAS $\ensuremath{\sigma}(\ensuremath{\theta})$; compared with microscopic direct-reaction model; deduced effective nucleon-nucleon interaction. Included knockon exchange amplitude.
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