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Soft dipole mode in 8He |
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| Authors: | L. V. Grigorenko M. S. Golovkov G. M. Ter-Akopian A. S. Fomichev Yu. Ts. Oganessian V. A. Gorshkov S. A. Krupko A. M. Rodin S. I. Sidorchuk R. S. Slepnev S. V. Stepantsov R. Wolski D. Y. Pang V. Chudoba A. A. Korsheninnikov E. A. Kuzmin E. Yu. Nikolskii B. G. Novatskii D. N. Stepanov P. Roussel-Chomaz W. Mittig A. Ninane F. Hanappe L. Stuttgé A. A. Yukhimchuk V. V. Perevozchikov Yu. I. Vinogradov S. K. Grishechkin S. V. Zlatoustovskiy |
| Affiliation: | 1. Joint Institute for Nuclear Research, Dubna, Russia 2. Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany 3. RRC “The Kurchatov Institute,”, Moscow, Russia 4. Henryk Niewodniczanski Institute of Nuclear Physics, Cracow, Poland 5. Department of Technical Physics, Peking University, Beijing, China 6. Faculty of Philosophy and Science, Silesian University in Opava, Opava, Czech Republic 7. GANIL, Caen Cedex 5, France 8. Slashdev Integrated Systems Solutions Rue de la Rochette, Gembloux, Belgium 9. PNTPM, Université Libre de Bruxelles, Bruxelles, Belgium 10. Institut de Recherches Subatomiques, IN2P3/Université Louis Pasteur, Strasbourg, France 11. RFNC—All-Russian Scientific Research Institute of Experimental Physics, Sarov, Russia |
| Abstract: | The low-lying spectrum of 8He was studied in the 3H(6He, p)8He transfer reaction for small center of mass angles. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6–3.9 MeV and (1+) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μb/sr. Some evidence for the excited state at about 7.5 MeV can be found in the data. The possible nature of the near-threshold anomaly above 2.14 MeV in 8He is related to the population of a 1− continuum (soft dipole excitation) with a peak energy value at about 3 MeV. This assumption can probably resolve the problem of a large uncertainty existing in the experimental data on the 8He 2+ state energy. The article is published in the original. |
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