Coupled-rearrangement-channels calculation of the three-body system under the absorbing boundary condition

We formulate the absorbing boundary condition (ABC) in the coupled-rearrangement-channels variational method (CNR) for the three-body problem. The absorbing potential is introduced in the system of the identical three-bosons, on which the boson symmetry is explicitly imposed by considering the rearrangement channels. The resonance parameters and the strength of the monopole breakup are calculated by the CRCVM + ABC method, and the results are compared with the complex scaling method (CSM). We have found that the results of the ABC method are consistent with the CSM results. The effect of the boson symmetry, which is often neglected in the calculation of the triple α reactions, is also discussed. (authors)