Quasi-Free Alpha-Alpha Collisions in Be^9 and C^<12> at 28 MeV

概要

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In the reactions Be^9(α, 2α)He^5 and C^<12>(α, 2α)Be^8 at 28 MeV, the single and summed energy spectra of emitted alpha-particles have been measured at several pairs of angle in order to investigate the quasi-free collision between incident alpha-particles and alpha-clusters in Be^9 and C^<12>. The summed energy spectrum of the alpha-particles from the reaction Be^9(α, 2α)He^5 shows a peak corresponding to the ground state of He^5 at the angles at which the emitted particles come from the collision between incident alpha-particles and nearly zero-momentum alpha-clusters in Be^9. The momentum spread of the alpha-cluster in Be^9 coupled with He^5 (ground state) is estimated to be 0.3 fm^<-1> from the angular correlation of the peak in the summed energy spectrum, and the probability of finding an alpha-cluster in this state is 0.12, if a plane wave impulse approximation is assumed. In the reaction C^<12>(α, 2α)Be_<g'nd>^8, the yield has a minimum at the angles expected from the quasi-free collision between incident alpha-particles and nearly zero-momentum alpha-clusters in C^<12>. The state in which an alpha-cluster is bound to Be^8 (ground state) in C^<12> seems to be very different from that for Be9.
社団法人日本物理学会の論文
1965-08-05