The 180 c.m. excitation function of the elastic and inelastic scattering of ' C on a Mg target has been measured between 12and 27-MeV c.m. energy. A statistical analysis of the data has been performed and it has turned out that the presence of intermediate structures cannot be completely ruled out in the compound dinuclear system Ar. Unfortunately, a complete phase shift analysis of several elastic scattering angular distributions measured on the maxima of these resonant structures shows that no spin assignment can be made. Therefore these intermediate structures appear to be spoiled by a more complex statistical resonance noise. At low incident energy, the Blair phase rule for oscillations in angular distributions is verified between the first 2+ target inelastic scattering and the elastic scattering.
NUCLEAR REACTIONS Measured elastic and inelastic excitationfunctions at |9, =180' for ' C+ Mg, 12~E, m &27 MeV. Deduced average width and autocorrelation and cross-correlation functions of the observed structure. Complete phase shift analysis of the elastic angular distributions measured at 24.8, 27.70, 28.60, 31.20, and 34.80 MeV ' C incident energy; angular range 10' to 180' c.m. Inelastic scattering data at the same energies. Partial observation of the Blair phase rule.
The angular distribution has been measured for the 3+ and 2+ ground state doublet in "Al with the heavyion charge exchange reaction Si{' 0, ' F) Al at the incident beam energy of 56 MeV. It has been analyzed in terms of the microscopic one-step direct charge exchange model and the second-order DWBA approach with recoil effect taking into account the two-step successive transfer: one nucleon stripping and pickup, and pickup and stripping process. The general shape of angular distribution has been reproduced by both approaches. The strength of the spin-isospin dependent two-body interaction potential extracted from one-step calculations is close to the upper limit of uncertainties reported in the light-ion charge exchange experiment.The two-step mechanism turns out to be also important and could be a competing process. P' NUCLEAR REACTION Si( 0, 8F), E=56 MeV; measured 0. (8); microscopic D%'BA analysis; second-order DWBA analysis with recoil effect; deduced strength of the (0 o)(v' v) term in the nucleon-nucleon two-body force.
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