Search for α-particles emitted at rest in the break-up of the12C-α-12C molecule-like configuration

A yield of α-particles emitted at rest is clearly observed in 16O+12C at several incident energies. These α-particles are detected by two methods: (i) the α-particle is considered as a missing mass in the detection of two 12C nuclei in coincidence; (ii) the α-particle is detected at 00 with a velocity due to the c.m. motion. Such a yield is assigned to a linear chain formation of the type 12C-α-12C and an excitation function between 40 and 65 MeV is given. The emission due to Coulomb effects is emphasized in the discussion to give the chief explanation of the coincidence results. (Auth.)