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Properties of very n -rich He isotopes |
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| Authors: | A. S. Fomichev L. V. Grigorenko M. S. Golovkov G. M. Ter-Akopian Yu. Ts. Oganessian V. A. Gorshkov S. A. Krupko A. M. Rodin S. I. Sidorchuk R. S. Slepnev S. V. Stepantsov R. Wolski V. Chudoba A. A. Korsheninnikov E. A. Kuzmin E. Yu. Nikolskii B. G. Novatskii D. N. Stepanov P. Roussel-Chomaz W. Mittig D. Pang A. Ninane F. Hanappe L. Stuttge A. A. Yukhimchuk V. V. Perevozchikov Yu. I. Vinogradov S. K. Grishechkin S. V. Zlatoustovskiy |
| Affiliation: | 1. Flerov Laboratory of Nuclear Reactions, JINR, RU-141980, Dubna, Russia 2. The Kurchatov Institute, RRC, Kurchatov sq. 1, 123182, Moscow, Russia 3. Institute of Nuclear Physics PAS, Henryk Niewodniczański, Cracow, Poland 4. GANIL, BP 5027, F-14076, Caen Cedex 5, France 9. NSCL Michigan State University, 48824-132, East Lansing, MI, USA 5. IPN and CRC, University of Louvain, B-1348, Louvain-la-Neuve, Belgium 6. PNTPM, Université Libre de Bruxelles, Bruxelles, Belgium 7. Institut Pluridisciplinaire Hubert Curien, IN2P3/Université Louis Pasteur, Strasbourg, France 8. Institute of Experimental Physics, RNFC All-Russian Research, RU-607190, Sarov, Russia |
| Abstract: | Low-energy spectra of the 8, 10He nuclei were investigated in the (t, p) -type reactions at small centre-of-mass angles using ～ 25 AMeV beams of 6He and 8He nuclei. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6-3.9MeV and (1+) at 5.3-5.5MeV, were populated with cross-sections of 200, 100-250, and 90-125μb/sr, respectively. To account for a near-threshold anomaly observed in the 8He spectrum the population of a 1- continuum (soft dipole excitation) was considered. The lowest-energy group of events in the 10He spectrum was observed at ～ 3 MeV with a cross-section of ～ 140 μb/sr. This result is consistent with the previously reported observation of 10He providing a new g.s. position for 10He at about 3MeV. |
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