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

Alvarez-Rodriguez, R.; Jensen, A. S.; Garrido, E.; Fedorov, D. V.; Fynbo, H. O. U.

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

Authors

Alvarez-Rodriguez, R.

Description

The complex scaled hyperspherical adiabatic expansion method is used to compute momentum and energy distributions of the three $α$-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 $J^π$ 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 $α$-particles.
11 pages, 7 figures, accepted for publication in Physical Review C