$α$-Particle Spectrum in the Reaction p+$^{11}$B$\to α+ ^8Be^*\to 3α$

Details $α$-Particle Spectrum in the Reaction p+$^{11}$B$\to α+ ^8Be^*\to 3α$ $α$-Particle Spectrum in the Reaction p+$^{11}$B$\to α+ ^8Be^*\to 3α$

2008-12-13

arxiv.org/abs/0812.2538v1

Physics

Nuclear Physics

Nuclear Theory

6 pages, 3 figures

Scientific paper

Using a simple phenomenological parametrization of the reaction amplitude we calculated $\alpha$-particle spectrum in the reaction p+$^{11}$B$\to \alpha + ^8Be^*\to 3\alpha$ at the resonance proton energy 675 KeV. The parametrization includes Breit-Wigner factor with an energy dependent width for intermediate $^8Be^*$ state and the Coulomb and the centrifugal factors in $\alpha$-particle emission vertexes. The shape of the spectrum consists of a well defined peak corresponding to emission of the primary $\alpha$ and a flat shoulder going down to very low energy. We found that below 1.5 MeV there are 17.5% of $\alpha$'s and below 1 MeV there are 11% of them.

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