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How to extract an electric dipole (E1) breakup cross section \sigma(E1) fromone- neutron removal cross sections measured by using 12C and 208Pb targets,\sigma_(-1n)^C and \sigma_(-1n)^Pb, respectively, is discussed. It is shownthat 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 isfound to be two times as large as that usually adopted. As a result, we obtain13-20% smaller \sigma(E1) of 31Ne at 250 MeV/nucleon than extracted in aprevious analysis of experimental data. By compiling the values of \Gammaobtained 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 massnumber dependence of the nuclear parts of the one-neutron removal cross sectionand the elastic breakup cross section is also investigated.

Extracting electric dipole breakup cross section of one-neutron halo nuclei from breakup observables