Isoscalar Giant Dipole Resonance in ^90Zr

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We have carried out investigation on the strength distribution of ISGDR excitations in ^90Zr nuclei via inelastic scattering of 400 MeV α particles obtained from the ring-cyclotron facility at RCNP, Japan. Measurements have been carried out over several angles between 0^circ and 12.5^circ. The instrumental background is completly eliminated by using the optics of the GRAND RAIDEN spectrometer. The exitation energy spectrum obtained at each angle is divided in to 1 MeV energy bins. The angular distributions obtained for each of these bins are then compared to the distorted wave Born approximation(DWBA) calculations to obtain the strength distribution of isoscalar E0, E1, E2, E3, E4 and E5 modes via multipole-decomposition technique. Detailed results of the analysis will be presented.

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