Abstract
The electric quadrupole transitions between , and states in are investigated in a model. The three-body wave functions are obtained by means of the hyperspherical adiabatic expansion method, and the continuum is discretized by imposing a box boundary condition. Corresponding expressions for the continuum three-body bremsstrahlung and photon dissociation cross sections are derived and computed for two different potentials. The available experimental energy dependence is reproduced and a series of other cross sections are predicted. The transition strengths are defined and derived from the cross sections, and compared to schematic rotational model predictions. The computed properties of the resonances suggest that the two lowest bands are made, respectively, by the states and . The transitions between the states in the first band are consistent with the rotational pattern corresponding to three alphas in an equilateral triangular structure. For the second band, the transitions are also consistent with a rotational pattern, but with the three alphas in an aligned arrangement.
4 More- Received 2 March 2015
DOI:https://doi.org/10.1103/PhysRevC.91.054003
©2015 American Physical Society