Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line

K. S. Vierinen, J. M. Nitschke, P. A. Wilmarth, R. B. Firestone, J. Gilat

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21 Scopus citations


The β-delayed proton and γ-ray decays of the two new isotopes 134,135Eu and of 136Eu, 134,135,136Sm, 134,135,136Pm and 135Nd were studied This is the flrst observation of β-delayed proton decay in europium isotopes. On-line mass separation and X-ray coincidences were used for isotope identification. Half-lives of 0.5 ±0.2 s and 1.5 ±0.2 s were measured for 134Eu and 135Eu respectively. For 136Eu evidence for two isomers with half-lives of 3.7 ±0.3 s and ~3.0 s was obtained. Betadelayed proton emission was assigned to the decays of 134Eu, 135Sm and 136Eu based on proton K X-ray coincidences and mass separation. Proton branching ratios of (9±3) × 10-4 for 136Eu and (2±1) × 10-4 for 135Sm were measured. Beta-delayed proton emission to the 0+ ground and to the 2+ excited states in 134Nd was observed following the 135Sm decay. The 135Eu activity was identified by Sm Kα X-rays from its electron-capture decay, and one γ-ray was assigned to this decay. Fast allowed Gamow-Teller 0+ → 1+ β-transitions to the 118.9keV level in 134Pm and 114.4keV level in 136Pm were identified. The low-spin β-decays of 136Pm and 135Nd were studied without significant interference from the high-spin decays, and decay schemes were constructed for 134,135,136Sm, 134,135,136pm and 136Eu.

Original languageEnglish (US)
Pages (from-to)1-28
Number of pages28
JournalNuclear Physics, Section A
Issue number1
StatePublished - Jul 17 1989
Externally publishedYes



ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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