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The $^{8}$He and $^{10}$He spectra studied in the (t, p) reaction

Abstract : The low-lying spectra of 8He and 10He nuclei were studied in the 3H(6He, p)8He and 3H(8He, p)10He transfer reactions. 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, respectively. Some evidence for a 8He state at about 7.5 MeV was obtained. We discuss a possible nature of the nearthreshold anomaly above 2.14 MeV in 8He and relate it to the population of a 1− continuum (soft dipole excitation) with a peak value at about 3 MeV. The lowest energy group of events in the 10He spectrum was observed at ∼ 3 MeV with a cross section of ∼ 140 μb/sr. We argue that this result is consistent with the previously reported observation of 10He providing the new 10He g.s. position at about 3 MeV
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Contributor : Michel Lion <>
Submitted on : Friday, January 23, 2009 - 10:19:26 AM
Last modification on : Friday, May 28, 2021 - 11:04:01 AM

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M.S. Golovkov, L.V. Grigorenko, G.M. Ter-Akopian, A.S. Fomichev, Yu.Ts. Oganessian, et al.. The $^{8}$He and $^{10}$He spectra studied in the (t, p) reaction. Physics Letters B, Elsevier, 2009, 672, pp.22-29. ⟨10.1016/j.physletb.2008.12.052⟩. ⟨in2p3-00355548⟩



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