Influence of neutron halo in the interaction of $^{6}$He nucleus of 35 MeV/nucleon with $^{197}$Au et $^{238}$U

Abstract : In this study, we have attempted to answer some of the questions still open concerning neutron halo nuclei. The interest of the latter lies in their very peculiar structure. The analysis of the kinematical features of the halo nucleus fragments originating from the dissociation following the interaction with a target nucleus is an essential tool for probing this structure. We studied the 6He + Au, U at 35 A.MeV system with a new method. Simultaneous measurements of the halo nucleus core, the halo neutrons and the excitation energy deposited in the target nucleus assessed with ORION allowed us to obtain information about the formation of the 5He nucleus and about the partial validity of the sudden approximation at moderate bombarding energy. The study of the core nucleus and neutron angular distributions confirmed that it is difficult to extract information on the internal structure at the halo neutrons from their widths. The halo neutron longitudinal momentum distributions were studied. Their widths were found to increase as the impact parameter decreases. The 4He - core parallel momentum distributions were also investigated. The widths are weakly dependent on the excitation energy deposited in the target nucleus, but increase with the 4He emission angle as for the halo neutrons. The ratio between one- and two-neutron stripping cross sections seems to indicate that the two halo neutrons are strongly correlated with a large dineutron component, as ascertained by a calculation in the framework of the Serber model.
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Y. Perier. Influence of neutron halo in the interaction of $^{6}$He nucleus of 35 MeV/nucleon with $^{197}$Au et $^{238}$U. Nuclear Experiment [nucl-ex]. Université de Caen, 1997. English. ⟨in2p3-00008699⟩

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