Beta decay half-lives of neutron rich Ti-Co isotopes around N = 40 (vol 660, pg 3, 1999)

The neutron-rich Ti57-59, V59-62, Cr61-64, Mn63-66, Fe65-68, Co67-70 at GAN IL. via interactions of a 60.4 MeV/u Kr-86(34+) With a Ni-58 target. They h ave been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent gam ma-rays have been observed for the most efficiently produced nuclei. The me asured half-lives of vanadium and chromium isotopes are compared to QRPA ca lculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of Ti-58 and Cr-64 indica te that these nuclei are potential r-process progenitors, after beta-decay, of Fe-58 and Ni-64 in certain inclusions of meteorites. (C) 2000 Elsevier Science B.V. All rights reserved.