Beta decay half-lives of neutron rich Ti–Co isotopes around [formula omitted

Abstract

The neutron-rich 57 –59 Ti, 59 –62 V, 61 –64 Cr, 63 –66 Mn, 65 –68 Fe, 67 –70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ-rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β-decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.