Abstract
How to extract an electric dipole (E1) breakup cross section \sigma(E1) from one- neutron removal cross sections measured by using 12C and 208Pb targets, \sigma_(-1n)^C and \sigma_(-1n)^Pb, respectively, is discussed. It is shown that within about 5% error, \sigma(E1) can be obtained by subtracting \Gamma \sigma_(-1n)^C from \sigma_(- 1n)^Pb, as assumed in preceding studies. However, for the reaction of weakly-bound projectiles, the scaling factor \Gamma is found to be two times as large as that usually adopted. As a result, we obtain 13-20% smaller \sigma(E1) of 31Ne at 250 MeV/nucleon than extracted in a previous analysis of experimental data. By compiling the values of \Gamma obtained for several projectiles, \Gamma=(2.30 +/- 0.41)\exp(- S_n)+(2.43 +/- 0.21) is obtained, where S_n is the neutron separation energy. The target mass number dependence of the nuclear parts of the one-neutron removal cross section and the elastic breakup cross section is also investigated.
Highlights
The neutron halo structure [1, 2], which indicates the breakdown of the saturation property of the nuclear density, is one of the novel properties of unstable nuclei
We describe one-neutron removal processes by means of sophisticated threebody reaction models: the continuum-discretized coupled-channels method with eikonal approximation (E-CDCC) [9, 10] for the elastic breakup and the eikonal reaction theory (ERT) [11, 12] for the one-neutron stripping
We have examined the E1 cross section formula, Eq (1), by describing the one-neutron removal process at 250 MeV/nucleon with three-body reaction models
Summary
The neutron halo structure [1, 2], which indicates the breakdown of the saturation property of the nuclear density, is one of the novel properties of unstable nuclei. The neutron halo structure is considered to be a rather general feature of unstable nuclei far from the stability line. One of the most well known probes for the halo structure is the interaction cross section σI [1, 2, 3, 4]. ΣI are measured for several isotopes with a target nucleus. A halo nucleus is identified at a mass number where a large increase in σI is found. It was concluded that 31Ne is a one-neutron halo nucleus with a large deformation of the 30Ne core.
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