Charged-particle decay of 28Si induced by quasi-monochromatic annihilation photons in the GDR |
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| Institution: | 1. Triangle Universities Nuclear Laboratory, Durham, NC 27708-0308, United States;2. Department of Physics, North Carolina State University, Raleigh, NC 27695-8202, United States;3. Department of Physics, Duke University, Durham, NC 27708-0305, United States;4. Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, United States;1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, People''s Republic of China;2. Frontiers Science Center for Rare isotopes, Lanzhou University, Lanzhou 730000, People''s Republic of China;3. School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, People''s Republic of China;1. Institut für Kernphysik, Fachbereich Physik, Technische Universität Darmstadt, 64289 Darmstadt, Germany;2. ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany;3. Department of Physics, University of Idaho, Moscow, ID 83844, USA;1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;2. School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. School of Physics, Engineering and Technology, University of York, York, United Kingdom;2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;3. Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany;4. Department of Physics, University of Liverpool, Liverpool, UK;5. Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA;6. Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland;7. Department of Physics, University of Surrey, Guildford, United Kingdom |
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| Abstract: | Spectra of protons and alpha-particles, emitted from the giant electric dipole resonance of 28Si excited by quasi-monochromatic photons from in-flight annihilation of accelerated positrons, were measured. Cross sections for six charged-particle decay channels were extracted in the energy region from 16.8 to 25.7 MeV. While the (γ, α0) cross section is completely statistical in nature, the (γ, p) process was found to have a 65% semidirect component, mainly in the (γ, p0) and (γ, p1+2) channels. |
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