2008/04/02 by M. S. Golovkov, L. V. Grigorenko, G. M. Ter-Akopian +37 · 74 citations
Physics and Astronomy · #Atomic physics #Dipole #Excitation #Excited state #Ground state #Nuclear physics research studies #Physics #Population #Quantum Chromodynamics and Particle Interactions #Quantum, superfluid, helium dynamics #Spectral line #nucl-ex
paper · pdf · open access · doi:10.1016/j.physletb.2008.12.052
published in Physics Letters B 672(1), 22-29 (Elsevier BV) · 18 pages, 8 figures, submitted to Phys. Lett. B
arxiv created 2008/04/02 · openalex publication_date 2009/01/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 3.6–3.9MeV 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 near-threshold 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 ∼140μb/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.