Role of nuclear couplings in the inelastic excitation of weakly bound neutron-rich nuclei |
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| Institution: | 1. The Niels Bohr Institute, Blegdamsvej 17, Copenhagen Ø, Denmark;2. Dipartimento di Fisica and INFN, Università di Padova, Padua, Italy;1. Departamento de Física, Instituto Tecnológico de Aeronáutica, DCTA, 12228-900, São José dos Campos, SP, Brazil;2. Departamento de Aceleradores y Estudio de Materiales, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, Código Postal 11801, México, Distrito Federal, Mexico;1. Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain;2. Science and Technology Research Centre, University of Huelva, 21071 Huelva, Spain;3. Dipartimento di Fisica Ettore Pancini, University of Naples Federico II, Naples, Italy;4. INFN-Laboratori Nazionali del Sud, 95123 Catania, Italy;5. Instituto de Física, UNAM, Mexico;6. INFN-National Laboratories of Legnaro, 35020 Legnaro (PD), Italy;7. Grand Accélérateur National d''Ions Lourds, BP 55027 - 14076 Caen, Cedex 05, France;8. Heavy Ion Laboratory, University of Warsaw, ul. Pasteura 5a, 02-093 Warsaw, Poland;9. LIP, Lisboa, Portugal;10. National Centre for Nuclear Research, ul. Andrzeja Sołtana 7, 05-400 Otwock, Poland;11. Department of Physics, The Florida State University, Tallahassee, FL 32306, USA;12. Centre d''Etudes Nucléaires de Bordeaux Gradignan, Chemin du Solarium, Gradignan F-33175, France;13. Rudjer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia;14. Dipartimento di Fisica e Astronomia, Università di Padova, via F. Marzolo 8, I-35131 Padova, Italy;15. INFN-Sezione di Padova, via F. Marzolo 8, I-35131 Padova, Italy;p. Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia;q. INFN-Naples, Italy;r. Centro de Estudios Avanzados en Física, Matemáticas y Computación, University of Huelva, 21071 Huelva, Spain;s. IFIN-HH PO-BOX MG-6, 76900 Bucharest Magurele, Romania |
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| Abstract: | We study the breakup of weakly bound systems close to the neutron drip line in collisions with heavy-ions. The process is described in terms of inelastic excitations leading to states in the continuum. The nuclear and Coulomb multipole fields induced by the reaction partner are both included in the microscopic construction of the inelastic form factors. A fraction of the dissociation cross sections is triggered by the presence of resonances at high excitation energy. The largest probabilities for breakup result, however, from strongly coupled transitions to low-lying states in the continuum. Nuclear couplings associated with inelastic excitation to these states are found to extend to unusually large distances. As a consequence, the interplay of nuclear and Coulomb excitations differs from the ordinary situation encountered in heavy-ion inelastic processes involving systems close to the stability line. |
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