Unbound exotic nuclei studied by transfer to the continuum reactions

摘要

In this paper we show that the theory of transfer reactions from bound to continuum states is well suited to extract structure information from data obtained by performing "spectroscopy in the continuum". The low energy unbound states of nuclei such as Li-10 and He-5 can be analyzed and the neutron-core interaction, necessary to describe the corresponding borromean nuclei Li-11 and He-6 can be determined in a semi-phenomenological way. An application to the study of Li-10 is then discussed and it is shown that the scattering length for s-states at threshold can be obtained from the ratio of experimental and theoretical cross sections. The scattering single particle states of the system n + Li-9 are obtained in a potential model. The corresponding S-matrix is used to calculate the transfer cross section as a function of the neutron continuum energy with respect to 9Li. Three different reactions are calculated Li-9(d,p)Li-10, Li-9(Be-9, Be-8)Li-10, Li-9(C-13, C-12)Li-10, to check the sensitivity of the results to the target used and in particular to the transfer matching conditions. Thus the sensitivity of the structure information extracted from experimental data on the reaction mechanism is assessed. (C) 2004 Elsevier B.V. All rights reserved.