Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002njph....4...50g&link_type=abstract
New Journal of Physics, Volume 4, Issue 1, pp. 50 (2002).
Physics
Scientific paper
The dipole strength function and the photoabsorption cross section for some He even-even isotopes close to the neutron drip-line region are systematically studied within a selfconsistent random phase approximation method in the continuum. In the systematic analysis several parametrizations of the Skyrme interaction with density and momentum dependent terms are used as the p-h residual interaction. Proton and neutron partial contributions to the total dipole strength and cross section are determined and the ratio R = σ(γ, p)/σ(γ, p) is calculated and compared to the measured data. On the same footing, calculations of the mean square radius and interaction cross section are carried out for the secondary beams of 4He, 6He and 8He produced through the fragmentation of 11Be primary beam with targets 9Be, 12C and 27Al at 800 MeV/nucleon. It is determined that some of the Skyrme force parametrizations give better results than others when compared to the experimental data. Finally, a determination of nuclear skins for the He isotopes is given.
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