Abstract
The structure of the mirror nuclei and is studied in a microscopic α+α+n and α+α+p three-cluster model using a fully antisymmetrized nine-nucleon wave function. The two-nucleon interaction includes central and spin-orbit components together with the Coulomb potential. The ground state of is obtained accurately with the stochastic variational method, while several particle-unbound states of both and are investigated with the complex scaling method. The calculation for supports the recent identification for the existence of two broad states around 6.5 MeV, and predicts the 3/ and 5/ states at about 4.5 MeV and 8 MeV, respectively. The similarity of the calculated spectra of and enables one to identify unknown spins and parities of the states. Available data on electromagnetic moments and elastic electron scatterings are reproduced very well. The enhancement of the E1 transition of the first excited state in is well accounted for. The calculated density of is found to reproduce the reaction cross section on a carbon target. The analysis of the beta decay of to clearly shows that the wave function of must contain a small component that cannot be described by the simple α+α+n model. This small component can be well accounted for by extending a configuration space to include the distortion of the α particle to t+p and h+n partitions. © 1996 The American Physical Society.
- Received 4 March 1996
DOI:https://doi.org/10.1103/PhysRevC.54.132
©1996 American Physical Society