2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178218Evidence for excitation of exotic S=+1 pentaquark degrees of freedom is presented by studying optical-potential fits to K^+ - nucleus total, reaction and elastic-differential cross section data at p(lab) = 500 - 700 MeV/c. Estimates of the underlying two-nucleon absorption K^+ n N --> Theta^+ N reaction cross section are made and are used for discussing the anticipated cross section of the strangeness exchange reaction K^+ N --> pi Theta^+.Paper extending the results and discussion of Phys. Rev. Lett. 94, 072301 (2005), nucl-th/0411052 v3. Tables interchanged. References updatedNuclear Theorytext