S. A. Krupko

The 8He and 10He spectra studied in the (t, p) reaction

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

New insight into the low-energy

The spectrum of

^{9}

^{9}\mathrm{He}

He spectrum

was studied by means of the

Structure of unbound neutron-rich

^{2}\mathrm{H}

^{9}

(

He studied using single-neutron transfer

^{8}\mathrm{He}

Exposure of Nuclear Track Emulsion to 8 He Nuclei at the ACCULINNA Separator

,

VME-based data acquisition system for multiparameter measurements

p

Soft dipole mode in 8He

)