(d, α) Reactions on O¹⁶, N¹⁴ and C¹² by 14.7 MeV Deuterons

Abstract

Angular distributions of α particles resulting from O¹⁶(d, α₀)N¹⁴ (ground state), N¹⁴(d, α₀)C¹² (ground state), N¹⁴(d, α₁)C¹² (first excited state), C¹²(d, α₀)B¹⁰ (ground state) and C¹²(d, α₁)B¹⁰ (first excited state) reactions were studied, α particles from the O¹⁶(d, α₀)N¹⁴, C¹²(d, α₀)B¹⁰ and C¹²(d, α₁)B¹⁰ reactions exhibited forward peaks and backward peaks simultaneously, while α particles from N¹⁴(d, α₀)C¹² reaction showed forward peaks and oscillatory behavior.
α particles leaving N¹⁴ and C¹² nuclei in their T=1 state were also observed in the forward angle, and the isotopic spin conservation rule seemed to be violated.
The reaction mechanism is then discussed on the basis of the surface direct reaction, the compound nucleus formation and α particle clustering in the target nucleus. It is concluded that α clustering may play an important role in the (d, α) reaction.