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A feasibility study was made of an important aspect of the Coulomb-dissociation method, which has been proposed for the determination of the rate of the astrophysically important C-12(alpha, gamma)160 reaction. A crucial aspect is the disentanglement of nuclear and Coulomb interactions on one hand and the separation of dipole and quadrupole contributions on the other. As a first step the resonant breakup via two well-known 2(+) states of 160 was measured. The differential cross section of Pb-208(O-16, O-16*)Pb-208 and the angular correlations of the fragments C-12 and alpha in the center of mass were measured and compared to theoretical predictions calculated in DWBA and the coupled-channel method. The best agreement was found for the state at 11.52 MeV associated to a one-step excitation from the ground state, while the 9.84 MeV requires coupling to the first-excited 2(+) state and is not well described. (c) 2005 Elsevier B.V. All rights reserved.

A feasibility study was made of an important aspect of the Coulomb-dissociation method, which has been proposed for the determination of the rate of the astrophysically important C-12(alpha, gamma)160 reaction. A crucial aspect is the disentanglement of nuclear and Coulomb interactions on one hand and the separation of dipole and quadrupole contributions on the other. As a first step the resonant breakup via two well-known 2(+) states of 160 was measured. The differential cross section of Pb-208(O-16, O-16*)Pb-208 and the angular correlations of the fragments C-12 and alpha in the center of mass were measured and compared to theoretical predictions calculated in DWBA and the coupled-channel method. The best agreement was found for the state at 11.52 MeV associated to a one-step excitation from the ground state, while the 9.84 MeV requires coupling to the first-excited 2(+) state and is not well described. (c) 2005 Elsevier B.V. All rights reserved.