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Excitation functions of inelastic and transfer channels in 12C+12C around E(C.M.)=32.5 MeV

A prominent and wide resonance centered at E(c.m.) = 32.5 MeV has recently been found in the (0(2)(+), 0(2)(+)) inelastic channel of the C-12 + C-12 reaction. It has been suggested that it corresponds to a 6 alpha-particle-chain state in Mg-24. In the present work we study C-12 + C-12 excitation functions between center-of-mass energies of 30 and 35 MeV in steps of 250 keV for weakly populated outgoing channels. We present the inelastic channels to the states above the alpha-particle decay threshold, (0(1)(+), 0(2)(+)), (0(1+), 3(1)(-)), and (0(1)(+), 4(1)(+)), and the one- and two-nucleon transfer channels. In the inelastic and the transfer channels we observe correlated intermediate-width structures at E(c.m.) = 31, 32.5, and 33.5 MeV, whose widths are appreciably smaller than the width measured in the (0(2)(+), 0(2)(+)) channel. Our E(c.m.) = 32.5 MeV angular distribution of the (0(1)(+), 0(2)(+)) channel exhibits oscillatory behavior and, unlike that of the (0(2)(+), 0(2)(+)) channel, does not display enhancement around theta(c.m.) = 90 degrees. Data were collected via the kinematic coincidence technique. For data reduction we use a novel approach allowing for the extraction of results on nonbinary channels.

Angular distributions; Energy-dependence; E(cm)=32.5 MeV; MeV resonance; States. Mg-24; Configurations; Scattering; Widths

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