Quest for Cooper Pair Transfer in Heavy-Ion Reactions: The Pb206+Sn118 Case

S. Szilner; L. Corradi; J. Diklić; T. Mijatović; F. Galtarossa; G. Pollarolo; E. Fioretto; A. Goasduff; G. Montagnoli; A. M. Stefanini; G. Colucci; P. Čolović; A. Gottardo; J. Grebosz; A. Illana; G. Jaworski; M. Jurado Gomez; T. Marchi; D. Mengoni; M. Milin; D. Nurkić; M. Siciliano; N. Soić; D. Testov; J. J. Valiente-Dobón; N. Vukman

doi:10.1103/PhysRevLett.133.202501

Quest for Cooper Pair Transfer in Heavy-Ion Reactions: The Pb206+Sn118 Case

S. Szilner, L. Corradi, J. Diklić, T. Mijatović, F. Galtarossa, G. Pollarolo, E. Fioretto, A. Goasduff, G. Montagnoli, A. M. Stefanini, G. Colucci, P. Čolović, A. Gottardo, J. Grebosz, A. Illana, G. Jaworski, M. Jurado Gomez, T. Marchi, D. Mengoni, M. Milin, D. Nurkić, M. Siciliano, N. Soić, D. Testov, J. J. Valiente-Dobón, N. Vukman

DOI 10.1103/PhysRevLett.133.202501 · Physical Review Letters

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Abstract

In this Letter we report on effects of nucleon-nucleon correlations probed in nucleon transfer reactions with heavy ions. We measured with high efficiency and resolution a complete set of observables for neutron transfer channels in the Pb206+Sn118 system employing a large solid angle magnetic spectrometer, which allowed us to study a wide range of internuclear distances via a detailed excitation function. The coupled channel theory, based on an independent particle transfer mechanism, follows the experimental transfer probabilities for one- and two-neutron pick-up and stripping channels. The experimental two-neutron transfer cross sections indicate that in reactions between pair-vibrational (closed shell) and pair-rotational (open shell) nuclei, correlations manifest via pair-addition and pair-removal modes, which constitute one of the elementary modes of excitations in nuclei.