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The decay of Eu150 (13 h) and Eu150 (≈ 5 y)

1965; Elsevier BV; Volume: 64; Issue: 3 Linguagem: Inglês

10.1016/0029-5582(65)90567-5

1873-1546

Matthias J. Guttman, E.G. Funk, J. W. Mihelich,

Nuclear physics research studies

Abstract The decay of the two isomeriic states of Eu150 has been studied using spectrometers and coincidence and directional correlation techniques. In addition, the gamma-ray spectrum of 5 y Eu150 has been investigated with a lithium-drifted germanium detector. The nucleus Eu150 (13 h) decays to both Sm150 and Gd150. The decay to Sm150 proceeds via electron capture and a 1242 keV position branch (0.3%) to the ground state keV.ure branches to levels at 334 (2+), 740 (0+), 1047 (2+), 1165 (2+), 1256 (0+) and 1970 (1−, 2+) keV. A level at 1764 keV is possible. Spin and parity assignments were established by internal conversion coefficient and gamma-gamma directional correlation measurements. Gamma-ray transitions of the following energies (and relative intensities) were observed: 334(8.3), 406(6.2), 714(0.4), 831(0.9), 922(0.8), 1165(0.7), 1230(0.2), 1636(0.14) and 1970(0.3) keV. A 1010 keV β− branch (87% of all decay) proceeds to the ground state of Gd150. The most likely assignment for the short-lived Eu150 is 1− or possibly 0−. The decay of Eu150 (≈ 5 y) proceeds to levels in Sm150 at 334(2+), 773(4+), 1072(3±), 1357(5, 3), 1505, 1642, 1822, 1973, 2021 and 2120 keV. A level at 1278 keV is also possible. Gamma-ray transitions of the following energies (and relative intensities) were observed in the decay: 298(