Analysis of 6He Coulomb breakup in the complex scaling method -: art. no. 054313

The transition strength for Coulomb breakup of He-6 into He-4+ n+n three-body unbound states is studied in the framework of the complex scaling method (CSM). We propose a method to analyze the three-body unbound states in which CSM is utilized to decompose the three-body transition strengths into resonance and continuum components. We calculate the contributions of E1 and E2 transitions, not only from three-body resonances, but also from two-body "He-5+n" and three-body "He-4+n+n" continuum states. From the calculated strength distributions, we discuss the characteristic structures of He-6 in the positive energy region, and also the Coulomb breakup mechanism of He-6. We show that the two-body "He-5+n" component is dominant in the total Coulomb breakup cross section.