The energy dependence of the total cross section for the mutual inelastic scattering reaction 12 C + 12 C~* 12 C(2 1 + ) + 12 C(2 1 + ) has been measured from £ c .m.( 12 C) =15 to 45 MeV. A rotationlike sequence of resonances is observed with strengths up to 17% of the unitarity limit and widths approaching the l2 C + 12 C single-particle width.The present Letter reports the observation of a striking series of previously unobserved resonances in the angle-integrated cross section of the reaction 12 C( 12 C, 12 C(2 + )) 12 C(2 + ) which shed new light on the nature of the intermediate-structure resonances in the 12 C + 12 C system.The initial studies 1 of the light-particle decay channels of the 12 C + 12 C system by Almqvist, Bromley, and Kuehner revealed resonances in the total reaction cross section near and below the Coulomb barrier (# c#m . = 5 to 7 MeV). Subsequent research 2 showed that these unusual compound-nucleus states have a partial width for decay back into the entrance channel which approaches the Wigner limit. These measurements constituted the first examples of nuclear molecular phenomena.In recent years the search for nuclear molecular phenomena in 12 C + 12 C has been extended to energies well above the Coulomb barrier. Detailed excitation functions of the/>, d, n, a, 8 Be, 12 C, and 12 C* channels as well as the total "fusion" cross section have been measured. 3 " 13 The light-particle decay channels are dominated by statistical evaporation processes and Ericson fluctuations. Detailed statistical analyses and searches for cross-channel correlations have revealed, however, discrete intermediate structures with 150^ r tot^ 700 keV. One such study, 3 which focused on thep + 23 Na channel, identified a rotational sequence of resonances with J 1T
DifFerential cross sections for quasielastic transfer were measured for S beams bombarding Mo and Nb targets at laboratory energies of 109, 116, and 125 MeV. Distorted-wave Born approximation calculations are in good agreement with the one-nucleon transfer data at all energies.Large transfer cross sections were observed for ' Mo and Nb targets which is consistent with the large sub-barrier fusion enhancement observed in the same systems. The transfer probability for one-nucleon transfer at large reaction distances is well described by the semiclassical model. There is a slope anomaly for two-proton stripping at energies just above the barrier but no anomaly for two-neutron pickup.PACS number(s): 25.70.Hi
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