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Soft Dipole Mode in $^{8}$He

Abstract : The low-lying spectrum of 8 He was studied in the 3 H( 6 He, p ) 8 He transfer reaction for small center of mass angles. The 0 + ground state (g.s.) of 8 He 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 μ b/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 8 He 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 8 He 2 + state energy.
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http://hal.in2p3.fr/in2p3-00423613
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Submitted on : Monday, October 12, 2009 - 11:13:07 AM
Last modification on : Friday, June 5, 2020 - 10:52:14 AM

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L.V. Grigorenko, M.S. Golovkov, G.M. Ter-Akopian, A.S. Fomichev, Yu.Ts. Oganessian, et al.. Soft Dipole Mode in $^{8}$He. Physics of Particles and Nuclei Letters, 2009, 6, pp.118-125. ⟨10.1134/S1547477109020046⟩. ⟨in2p3-00423613⟩

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