Radiative proton capture to discrete states in 31N at 98 and 176 MeV |
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| Affiliation: | 1. Department of Radiation Sciences, Uppsala University, S-751 21 Uppsala, Sweden;2. Department of Physics, North Carolina State University, Raleigh, NC 27695, USA;1. School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;2. School of Physics and Nuclear Energy Engineering, Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China;3. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China;4. Research Centre for Nuclear Physics, Osaka University, Osaka 567-0047, Japan;5. RIKEN (Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;1. IGFAE and Dpt. de Física de Partículas, Univ. of Santiago de Compostela, E-15758, Santiago de Compostela, Spain;2. LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, F-14000 Caen, France;3. Center for Exotic Nuclear Studies, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea;4. Department of Physics, University of Surrey, Guildford GU2 5XH, UK;5. IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France;6. KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium;7. CNS, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan;8. GANIL, CEA/DRF-CNRS/IN2P3, Bd. Henri Becquerel, BP 55027, F-14076 Caen, France;9. Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo, Japan;10. NAT Research Center, NAT Corporation, 3129-45 Hibara Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1112, Japan;11. Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France;12. School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK;13. INFN, Laboratori Nazionali del Sud, Via S. Sofia 44, Catania, Italy;14. Department of Physics, University of Regina, Regina, SK S4S 0A2, Canada;15. IFIN-HH, P. O. Box MG-6, 76900 Bucharest-Magurele, Romania;1. Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea;2. Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea;3. Rare Isotope Science Project, Institute for Basic Science, 1 Gukjegwahak-ro, Yuseong-gu, Daejeon 34000, Republic of Korea;4. LPC Caen, Normandie Université, ENSICAEN, UNICAEN, CNRS/IN2P3, F-14050 Caen, France;5. Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan;6. Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany;7. ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany;8. RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan;9. Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan;10. Department of Physics, Rikkyo University, 3 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan;11. Department of Physics, Kyoto University, Kyoto 606-8502, Japan;12. GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen Cedex 5, France;13. Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom;14. Institut de Physique Nucléaire, Université Paris-Sud, IN2P3/CNRS, 91406 Orsay, France |
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| Abstract: | A high resolution magnetic pair spectrometer for medium energy photons has been used for studies of the exclusive (p,γ) reaction on 12C at 98 and 176 MeV. We present angular distributions of the differential cross section for transitions to the ground state and the first three excited states of 13N. The distributions from these four states are compared with predictions from a microscopic continuum shell model calculation using a realistic finite-ranged effective interaction with tensor components. In general, reasonable agreement is obtained for reactions to states described by p shell single particle wave functions, but poor agreement is obtained for transitions described by sd shell single particle wave functions. Nevertheless we find, however, that the dominant reaction mechanism is a direct capture process. We also compare the (p,γ) data with existing data on the exclusive (p,π) reaction at 185 MeV revealing notable differences between the two reactions. |
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