Eur. Phys. J. Special Topics 150, 61-66 (2007)
https://doi.org/10.1140/epjst/e2007-00267-7

Neutron excess nuclei of hydrogen and helium at ACCULINNA

¹ Joint Institute for Nuclear Research, 141980 Dubna, Russia
² The Henryk Niewodniczański Institute of Nuclear Physics, Kraków, Poland
³ RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
⁴ GANIL, BP. 5027, 14076 Caen Cedex 5, France
⁵ The Kurchatov Institute, Kurchatov sq. 1, 123182 Moscow, Russia

Received: 31 January 2007
Published online: 8 December 2007

Abstract

Attempt to observe a ⁷H resonance produced in the reaction ²H(⁸He,³He)⁷H resulted only in setting a limit dσ/dΩ≤ 20 μb/sr for the reaction exit channel which could populate a resonance lying between 0 and 3 MeV above the ⁷H decay threshold. The quasi-free scattering of the α core bound in ⁶He was explored keeping in mind the possible study of the cluster structure of this halo nucleus. For the first time coincident particles emitted in the ⁴He(⁶He, 2α)nn reaction were detected in wide angular ranges giving a wide kinematical range of the measured angular and momentum distributions. The contribution of processes, competing with QFS in the α+ α+n+n output channel, was considerably suppressed by the selection of events with E_α1(2)-nn>10 MeV. A number of experimental distributions, relevant to the reaction mechanism and to the ⁶He structure, were compared with the results of MC simulations based on the PWIA formalism. The PWIA predictions showed consistency with the experimental data.