Excitation of Spin-Flip States of Light Nuclei in Inelastic Scattering of Alpha Particles

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¹Department of Physics, Faculty of Science, Kyoto University

Received November 30, 1966

Angular distributions of inelastically scattered alpha-particles, leading to the Δ T =0 spin-flip states of C ¹² at 12.7 MeV and B ¹¹ at 8.6 MeV, were observed. These angular distributions were found to show a unique pattern. Such characteristic of the angular distributions were also observed for the 10.4 MeV state of Mg ²⁴ and the 8.9 MeV state of Si ²⁸. These four states were systematically interpreted as the Δ T =0 spin-flip states by the j - j coupling shell model. The excitation mechanism for these states is discussed and it is concluded that a spin-orbit interaction between the incident alpha-particle and a nucleon in the target nucleus plays an important role. The angular distribution for another unnatural-parity state of C ¹² at 11.8 MeV (2 ^-). Mg ²⁴ at 5.22 MeV(3 ⁺) and Si ²⁸ at 6.27 (3 ⁺) were also observed. The 14.08 MeV collective state of C ¹² was found to be excited strongly.

https://doi.org/10.1143/JPSJ.22.685

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Excitation of Spin-Flip States of Light Nuclei in Inelastic Scattering of Alpha Particles

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