ar X iv : n uc l - th / 9 81 10 82 v 1 2 4 N ov 1 99 8 Excitation of the GDR and the Compressional Isoscalar Dipole State by α scattering
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چکیده
The excitation of the isovector giant dipole resonance (GDR) by alpha scattering is investigated as a method of probing the neutron excess in exotic nuclei. DWBA calculations are presented for 28 O and 70 Ca and the interplay of Coulomb and nuclear excitation is discussed. Since the magnitude of the Coulomb excitation amplitude is strongly influenced by the Q–value, the neutron excess plays an important role, as it tends to lower the energy of the GDR. The excitation of the compressional isoscalar dipole state in 70 Ca by α scattering is also investigated. It is shown that the population of this latter state may be an even more sensitive probe of the neutron skin than the isovector GDR. Keyword list: DWBA for α scattering on 28 O, 70 Ca, isoscalar and isovector dipole resonance.
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تاریخ انتشار 1998