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Properties of the He ground state from He neutron knockout |
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| Authors: | Yu Aksyutina HT Johansson T Aumann K Boretzky MJG Borge A Chatillon LV Chulkov D Cortina-Gil U Datta Pramanik H Emling C Forssén HOU Fynbo H Geissel G Ickert B Jonson R Kulessa C Langer M Lantz T LeBleis AO Lindahl K Mahata M Meister G Münzenberg T Nilsson G Nyman R Palit S Paschalis W Prokopowicz R Reifarth A Richter K Riisager G Schrieder H Simon K Sümmerer O Tengblad H Weick MV Zhukov |
| Institution: | 1. GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany;2. Fundamental Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden;3. Instituto Estructura de la Materia, CSIC, E-28006 Madrid, Spain;4. Kurchatov Institute, RU-123182 Moscow, Russia;5. University of Santiago de Compostela, 15706 Santiago de Compostela, Spain;6. Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;g Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark;h Instytut Fizyki, Universytet Jagielloński, PL-30-059 Kraków, Poland;i Institutionen för Fysik, University of Gothenburg, S-412 96 Göteborg, Sweden;j Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany;k Institut für Kernphysik, Johann-Wolfgang-Goethe-Universität, D-60486 Frankfurt, Germany;l Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom |
| Abstract: | The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s -wave component at low energies in the α+n relative energy spectrum. |
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