Beta-delayed proton precursors with 59≦Z≦62

P. A. Wilmarth, J. M. Nitschke, P. K. Lemmertz, R. B. Firestone

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


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 [1] 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.

Original languageEnglish (US)
Pages (from-to)179-180
Number of pages2
JournalZeitschrift für Physik A Atoms and Nuclei
Issue number1
StatePublished - Mar 1985
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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