Excitation of the isovector GDR by inelastic α-scattering as a measure of the neutron skin of nuclei - INSPIRE

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Excitation of the isovector GDR by inelastic α-scattering as a measure of the neutron skin of nuclei

1994

20 pages

Published in:

Nucl.Phys.A 567 (1994) 521-540

Published: 1994

DOI:

10.1016/0375-9474(94)90022-1

View in:

Nuclear Science References

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Abstract: (Elsevier)

The cross section of the isovector giant dipole resonance (GDR) has been measured in the 116,124 Sn(α, α′γ 0 ), 150 Nd(α, α′γ 0 ) and 208 Pb(α, α′γ 0 ) reactions at E α = 120 MeV and 0° ⩽ Θ α ′ ⩽ 3°. The results are compared with DWBA calculations performed with nuclear GDR form factors that depend on the relative difference between the radii of proton and neutron distributions ( ΔR PN / R 0 ). Taking a linear combination of form factors provided by the Gold-haber-Teller and Steinwedel-Jensen models in a ratio that fits the GDR systematics, the ΔR PN values for 116 Sn, 124 Sn and 208 Pb were deduced by comparing measured and calculated cross sections to be 0.02 ± 0.12 fm, 0.21 ± 0.11 fm, and 0.19 ± 0.09 fm, respectively. For the deformed 150 Nd, the neutron-skin thickness along and perpendicular to the symmetry axis was found to be 0.22 ± 0.16 and 0.50 ± 0.15 fm, respectively, yielding β n 2 / β p 2 = 0.92 ± 0.08.

Nuclear reactions

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