Elsevier

Nuclear Physics

Volume 42, March–April 1963, Pages 441-453
Nuclear Physics

Quasi-elastic proton-alpha collisions in carbon

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Abstract

The possibility of quasi-elastic p-α collisions in carbon nuclei has been investigated experimentally by looking for correlated proton-alpha coincidences when C12 is bombarded by 150 MeV protons. A peak was found in the angular correlation centred about the kinematic angle for free p-α collisions and with a width, which when interpreted as arising from the α-cluster momentum before impact, gives momenta of about the same size as are observed in high-energy (p, 2p) reactions. Under the circumstances of the experiment the probability of finding an α-cluster in the C12 nucleus was found to be 0.30−0.11+0.23 using a plane wave impulse approximation to integrate over the angular correlation. This figure is considered to be large since no allowance has been made for the strong nuclear absorption effects expected. The detailed results pose certain problems for the α-cluster model of the C12 ground state.

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