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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Fomichev, A.S., Grigorenko, L.V., Golovkov, M.S. et al. Properties of very n -rich He isotopes. Eur. Phys. J. A 42, 465–469 (2009). https://doi.org/10.1140/epja/i2008-10739-6
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DOI: https://doi.org/10.1140/epja/i2008-10739-6