The new, beta-delayed proton emitters128Pr(3.2-0.4+0.5 s),130Pm(2.2-0.4+0.6 s), and132Pm(5.0-0.6+0.8 s) have been observed at the on-line isotope separator OASIS. Also studied were129Nd and133Sm. Our on-going study of the decay properties of very neutron-deficient lanthanides has led to detailed information about beta-delayed proton emitters with 59≤Z≤62. The isotopes were produced at the SuperHILAC's on-line isotope separator OASIS  in reactions of40Ca projectiles on92Mo and96Ru targets enriched to >95%. Decay studies were carried out in a low background spectroscopy laboratory. The isotope of interest was passed through a slit in the focal plane of the mass separator, transported ionoptically to a fast cycling tape, and periodically positioned between a silicon charged particle telescope, a HPGe x-ray detector, and a GAMMA-X Ge detector. Decays involving beta-delayed gamma rays and protons along with any coincident positrons, x-rays and gamma rays were measured event-by-event and written to computer tape for subsequent replay and analysis.
ASJC Scopus subject areas
- Nuclear and High Energy Physics