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      Microscopic analysis of K^+-nucleus elastic scattering based on K^+N phase shifts

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          Abstract

          We investigate \(K^{+}\)-nucleus elastic scattering at intermediate energies within a microscopic optical model approach. To this effect we use the current \(K^{+}\)-nucleon {\it (KN)} phase shifts from the Center for Nuclear Studies of the George Washington University as primary input. First, the {\it KN} phase shifts are used to generate Gel'fand-Levitan-Marchenko real and local inversion potentials. Secondly, these potentials are supplemented with a short range complex separable term in such a way that the corresponding unitary and non-unitary {\it KN} \(S\) matrices are exactly reproduced. These {\it KN} potentials allow to calculate all needed on- and off-shell contributions of the \(t\) matrix,the driving effective interaction in the full-folding \(K^{+}\)-nucleus optical model potentials reported here. Elastic scattering of positive kaons from \(^{6}\)Li, \(^{12}\)C, \(^{28}\)Si and \(^{40}\)Ca are studied at beam momenta in the range 400-1000 MeV/{\(c\)}, leading to a fair description of most differential and total cross section data. To complete the analysis the full-folding model, three kinds of simpler \(t\rho\) calculations are considered and results discussed. We conclude that conventional medium effects, in conjunction with a proper representation of the basic {\it KN} interaction are essential for the description of \(K^{+}\)-nucleus phenomena.

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          Author and article information

          Journal
          2005-03-31
          10.1103/PhysRevC.72.025203
          nucl-th/0504001
          Custom metadata
          Phys.Rev. C72 (2005) 025203
          11 pages, 1 table, 12 figures, submitted to PRC
          nucl-th

          Nuclear physics

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