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The reaction A(pi,pi pi)X has been studied at low energies, paying particularattention to the interaction of the two final pions in the scalar isoscalar(I=J=0) channel. We have developed a microscopic model for the pion production,and then implemented the two pion final state interaction by using the resultsof a non-perturbative unitary coupled-channels method based in the standardchiral Lagrangians. The resulting model, describes well the reaction on thenucleon for all different isospin channels.  Finally, we have considered the reaction in nuclei. Our calculation takesinto account Fermi motion, Pauli blocking, pion absorption, and also the strongmodification of the pi-pi interaction in the nuclear medium.Comment: 21 pages, 9 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Scalar isoscalar pion pairs in nuclei and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>(</mml:mo><mml:mi>π</mml:mi><mml:mo>,</mml:mo><mml:mi>π</mml:mi><mml:mi>π</mml:mi><mml:mo>)</mml:mo><mml:mi>X</mml:mi></mml:math>reaction

Scalar isoscalar pion pairs in nuclei and theA(π,ππ)Xreaction