Decay of¹⁴⁹Gd and directional correlations of gamma cascades in¹⁴⁹Eu

The decay of¹⁴⁹Gd(9.4d) to the levels of¹⁴⁹Eu has been studied using large volume high resolution Ge(Li) and NaI(Tl) detectors, γ-γ coincidence and directional correlation experiments have been performed. New γ-rays at energies 131.9, 278.6, 384.7, 415.7, 599.2, 726.5, 734.7, 956.4 and 1,231.1 keV in¹⁴⁹Eu have been observed. Three new levels in¹⁴⁹Eu have been placed at 956.4, 1,082.0 and 1,231.1 keV. Spin-parity assignments have been made to some of the levels in¹⁴⁹Eu. Multipolarity assignments have been made for most of the electromagnetic transitions from the conversion coefficients obtained through the knowledge of our γ-transition intensities and the published conversion-electron intensities. Based on the new γ-transitions observed in the singles and coincidence spectra, a revised level scheme has been proposed for¹⁴⁹Eu and compared with previously published level schemes. Radioactivity¹⁴⁹Gd; measured T_1/2, T_γ, γγ coin, γγ(θ), I.C.C.,¹⁴⁹Eu deduced levels, J, γ-mixing, π. Enriched targets, Ge(Li) detectors.