PARITY-VIOLATING LI-6(0(-]ALPHA+D DECAY AND LI-6(0(+)1)-]ALPHA+D+GAMMA-M1 TRANSITION()1))

Parity-violating Li-6 (J(pi)T = 0(+)1, E = 3.563 MeV) decay into the alpha + d continuum is studied theoretically. The three-body alpha + N + N wave function is used for Li-6; and the alpha + d channel is desc ribed on the basis of the optical model. The parity-forbidden width of Li-6(0(+)1) is found to be within the interval Gamma(pv) = (0. 16-0.9 2) x 10(-8) eV, depending on the model assumptions about short-range n ucleon-nucleon correlations. It is shown that the parity-violation eff ect could be masked by the background alpha + d + gamma M1 decay if th e experimental energy resolution were not sufficiently high. The backg round process is related in a straightforward way to the recently meas ured beta decay of the He-6 halo nucleus into the alpha + d continuum and can also be used as a tool for investigating the halo structure.