TY - JOUR
T1 - Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line
AU - Vierinen, K. S.
AU - Nitschke, J. M.
AU - Wilmarth, P. A.
AU - Firestone, R. B.
AU - Gilat, J.
N1 - Funding Information:
This work was supported by the Director, Office of Energy Research, Division of Nuclear Physics of the Office of High Energy and Nuclear Physics of the USA Department of Energy under Contract DE-AC03-76SF00098. One of the authors (K.S.V.) wishes to thank the National Research Council for Sciences, Academy of Finland and University of Helsinki for support. We express our thanks to the staff of the SuperHilac accelerator of the Lawrence Berkeley Laboratory, and L. Archam-bault and A. Wydler for their excellent and efficient cooperation.
PY - 1989/7/17
Y1 - 1989/7/17
N2 - 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.
AB - 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.
KW - RADIOACTIVITY
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U2 - 10.1016/0375-9474(89)90266-2
DO - 10.1016/0375-9474(89)90266-2
M3 - Article
AN - SCOPUS:0002083420
SN - 0375-9474
VL - 499
SP - 1
EP - 28
JO - Nuclear Physics, Section A
JF - Nuclear Physics, Section A
IS - 1
ER -