In-beam γ-ray spectroscopy of 43-46 Cl.

The low-energy nuclear structure of the neutron-rich 43-46Cl isotopes is studied via in-beam γ-ray spectroscopy following the fragmentation of 48K projectiles on a 9Be target at intermediate beam energies, γγ coincidence information was used to construct level schemes for these neutron-rich nuclei. For the N = 28 nucleus 45Cl, the lifetime of the first excited state at 130 keV was extracted via γ-ray line shape analysis, yielding an M1 strength an order of magnitude greater than that predicted by theory. The experimental data is compared to the results of large-scale shell-model calculations with effective interactions in the sd-pf model space. [ABSTRACT FROM AUTHOR]