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Properties of very n-rich He isotopes

par Fomichev, Andrey;Grigorenko, Leonid;Golovkov, M.S.;Ter-Akopian, Gurgen;Oganessian, Yu.Ts.;Gorshkov, V.A.;Krupko, S.A.;Rodin, AM;Sidorchuk, S.I.;Slepnev, R.S.;Stepantsov, S.V.;Wolski, Roman;Chudoba, V.;Pang, Danyang;Korsheninnikov, A.A.;Kuzmin, E.A.;Nikolskii, Yu;Novatskii, B.G.;Stepanov, D.N.;Roussel-Chomaz, Patricia;Mittig, Wolfgang;Ninane, A.;Hanappe, Francis ;Stuttge, Louise;Yukhimchuk, Arkadiy;Perevozchikov, V.V.;Vinogradov, Yu;Grishechkin, S.K.;Zlatoustovskiy, S.V.
Référence European Physical Journal A. Hadrons and Nuclei, 42, 3, page (465-469)
Publication Publié, 2009-12

Article révisé par les pairs

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Résumé :

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. © Societá Italiana di Fisica / Springer-Verlag 2009.