Excess neutron nucleus 11Be as a product of reaction (t, p)

摘要

The (t, p) reaction on the 9Be nucleus is analyzed using the mechanisms of dineutron stripping and 8Li heavy cluster stripping. It is shown that in the shell model, the wave function of the 11Be(1/2+) nucleus formed by adding two neutrons to the 9Be nucleus is constructed from a 10Be(0+) core and a 2s-neutron. This concept of the 11Be(1/2+) structure allows us to calculate the reduced width of tritium and a dineutron with a relative orbital angular momentum equal to 1. The differential cross section of the (t, p) reaction is calculated with allowance for the contribution from both mechanisms. The agreement between the theoretical and experimental cross sections of dineutron stripping at narrow angles θp confirms the shell model can be used to describe the states of nuclei with complex structure and mixed configurations of different shells.