Toward a Consistent Description of the PNC Experiments in A=18-21 Nuclei

The experimental PNC results in 18F, 19F, 21Ne and the current theoretical analysis show a discrepancy . If one interprets the small limit of the experimentally extracted PNC matrix element for 21Ne as a destructive interference between the isoscalar and the isovector contribution, then it is difficult to understand why the isovector contribution in 18F is so small while the isoscalar + isovector contribution in 19F is relatively large. In order to understand the origin of this discrepancy a comparison of the calculated PNC matrix elements was performed. It is shown that the 18F and 21Ne matrix elements contain important contributions from 3h̄ω and 4h̄ω configuration and that the (0+1)h̄ω calculations give distorted results. PACS numbers: 21.60.-n,21.60.Cs,27.20.+n,11.30.Er,21.10.Ky