Abstract
Reaction cross sections (σR) for the neutron-rich nucleus 14B on Be, C, and Al targets have been measured at several energies in the intermediate energy range of 45–120 MeV/nucleon. The present experimental σR show a significant enhancement relative to the systematics of stable nuclei. The nucleon density distribution was deduced through the fitting procedure with the modified Glauber calculation. The necessity of a long tail in the density distribution was found, which is consistent with the valence neutron in 2s1/2 orbital with the small empirical one-neutron separation energy in 14B.
Highlights
We have measured reaction cross sections (σR) for 14B at intermediate energies where σR is more sensitive to dilute densities like a halo compared to higher energies
For the formation of a neutron halo, a small one- or two-neutron separation energy and a small orbital angular momentum ( = 0 or 1) are considered to be essential
They found considerably small width of the momentum distribution that strongly supports the significant contribution of the 2s1/2 component in the valence neutron configuration
Summary
We have measured reaction cross sections (σR) for 14B at intermediate energies where σR is more sensitive to dilute densities like a halo compared to higher energies. From the energy dependence of σR, the nucleon density distribution of 14B has been deduced through the fitting procedure with the modified Glauber calculation. The 14B beams with intensities of 50−100 counts/spill and energies of 30−130 MeV/nucleon were focused onto the reaction target placed at the final focus (F3).
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