Abstract
Neutron-rich , 24, 26 magnesium isotopes were studied via in-beam -ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory following secondary fragmentation reactions on a carbon target at . In the one- and two-proton removal channels from and beams, two distinct -ray transitions were observed in , while in the one-proton removal reaction from a new transition was observed in addition to the known decay. From the experimental systematics and comparison to theoretical predictions it is concluded that the transitions belong to the and decays in and , respectively. For , previously reported and level energies were remeasured. The deduced ratios for of 3.14(5), 3.07(5), and 3.07(5) are almost identical and suggest the emergence of a large area of deformation extending from the to the shell quenching.
- Received 25 August 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.212502
© 2013 American Physical Society