Momentum distributions of $α$-particles from decaying low-lying $^{12}$C-resonances

Details Momentum distributions of $α$-particles from decaying low-lying $^{12}$C-resonances Momentum distributions of $α$-particles from decaying low-lying $^{12}$C-resonances

2008-05-09

arxiv.org/abs/0805.1332v1

Phys.Rev.C77:064305,2008

Physics

Nuclear Physics

Nuclear Theory

11 pages, 7 figures, accepted for publication in Physical Review C

Scientific paper

10.1103/PhysRevC.77.064305

The complex scaled hyperspherical adiabatic expansion method is used to compute momentum and energy distributions of the three $\alpha$-particles emerging from the decay of low-lying $^{12}$C-resonances. The large distance continuum properties of the wave functions are crucial and must be accurately calculated. We discuss separately decays of natural parity states: two $0^+$, one $1^{-}$, three $2^+$, one $3^-$, two $4^+$, one $6^+$, and one of each of unnatural parity, $1^{+}$, $2^-$, $3^+$, $4^-$. The lowest natural parity state of each $J^{\pi}$ decays predominantly sequentially via the $^{8}$Be ground state whereas other states including unnatural parity states predominantly decay directly to the continuum. We present Dalitz plots and systematic detailed momentum correlations of the emerging $\alpha$-particles.

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