Abstract
The cluster structure in is investigated by the microscopic generator coordinate method with the Brink cluster wave functions. With a proper choice of the parameters of the effective interaction, the calculated energy spectrum shows reasonable agreement with the observed low-lying spectra of both parities. On the basis of the calculated radii, and monopole and transition strengths, several developed cluster states of are suggested. For the negative-parity states, in addition to the well-known cluster state, the and states are also proposed as the well-developed cluster states. For the positive-parity states, it is found that many states around the threshold show the feature of developed clusters. In particular, the state is found to have a linear-chain-like structure, which is consistent with the previous antisymmetrized molecular dynamics calculation, but contradicts the orthogonality condition model calculation. It is also found that many of these positive-parity cluster candidates have non-negligible isoscalar dipole transition strengths, which require experimental confirmation.
4 More- Received 13 November 2017
- Revised 24 September 2018
DOI:https://doi.org/10.1103/PhysRevC.98.054323
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