Half-lives of neutron-rich nuclei around ^35,36Mg

We performed a decay spectroscopy experiment investigating neutron-rich nuclei around ^35,36Mg at the RIBF (Radioactive Isotope Beam Factory, RIKEN, Japan). These nuclei were produced by relativistic projectile fragmentation of a 345 AMeV ⁴⁸Ca primary beam from the superconducting ring cyclotron SRC with an average intensity of 70 pnA. The secondary cocktail beam was separated and identified with the BigRIPS [1]fragment separator and the ZeroDegree spectrometer (ZDS). The unambiguous particle identification was achieved by the multiple measurement of the energy loss (δE), time of flight (TOF) and magnetic rigidity (Bρ) event-by-event. The identified fragments were implanted in the CAITEN [2]detector (Cylindrical Active Implantation Target for Efficient Nuclear-decay study). The main part of this detector is a highly segmented plastic scintillator with the shape of a hollow cylinder. To reduce background decay events the scintil-lator was rotated and in additiom moved vertically. Implantations and decays were correlated in time and space to determine precise half-lives for the implanted nuclei.