Doorway states in nuclear reactions as a manifestation of the “super-radiant” mechanism |
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| Institution: | 1. School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel;2. National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1321, USA;1. Department of Physics, Western Michigan University, Kalamazoo, MI 49008-5252, USA;2. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824-1321, USA;3. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1321, USA;4. Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824-1321, USA;5. Physics Department, Faculty of Science, University of Zagreb, Croatia;1. Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany;2. ExtreMe Matter Institute EMMI and Research Division, GSI, 64291 Darmstadt, Germany;3. Frankfurt Institute for Advanced Studies FIAS, 60438 Frankfurt am Main, Germany;4. Kernfysisch Versneller Instituut, University of Groningen, 9747 AA Groningen, The Netherlands;5. GANIL, CEA/DSM-CNRS/IN2P3, 14076 Caen, France;6. Department of Physics, Ohio State University, Columbus, OH 43210, USA;7. Triangle Universities Nuclear Laboratory, Durham, NC 27708, USA;8. Department of Physics, North Carolina State University, Raleigh, NC 27695, USA;9. Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea;10. Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany;11. Department of Physics, Duke University, Durham, NC 27708, USA;1. The University of Tennessee at Knoxville, Department of Physics & Astronomy, Knoxville, TN 37996-1200, USA;2. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;3. XIA LLC, 31057 Genstar Road, Hayward, CA 94544, USA;1. Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy;2. Dipartimento di Fisica dell''Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy;3. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;4. IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;5. Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy;6. Dipartimento di Fisica dell''Università di Napoli Federico II, Napoli, Italy;7. School of Computing, Engineering and Mathematics, University of Brighton, Brighton, United Kingdom;8. Osaka University, Osaka, Japan;9. Department of Physics, University of Surrey, Guildford, United Kingdom;10. University of York, York, United Kingdom;11. Tohoku University, Sendai, Japan;12. Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan;13. CNS, University of Tokyo, Tokyo, Japan;14. University of Oslo, Oslo, Norway;15. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, Italy;p. IPNO Orsay, Orsay, France;q. MTA Atomki, Debrecen, Hungary;r. INFN sezione di Firenze, Firenze, Italy;s. Dipartimento di Fisica dell''Università degli Studi di Padova, Padova, Italy;t. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy;u. Instituut voor Kern- en StralingsFysica, K.U. Leuven, Belgium;v. Advanced Science Research Center, JAEA, Tokai, Ibaraki, Japan;w. Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain;x. Departamento de Fisica Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain;y. Department of Physics, Istanbul University, Istanbul, Turkey |
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| Abstract: | A mechanism is considered for generating doorway states and intermediate structure in low-energy nuclear reactions as a result of collectivization of widths of unstable intrinsic states coupled to common decay channels. At the limit of strong continuum coupling, the segregation of broad (“super-radiating”) and narrow (“trapped”) states occurs revealing the separation of direct and compound processes. We discuss the conditions for the appearance of intermediate structure in this process and doorways related to certain decay channels. |
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