Portal de Periódicos da CAPES

Negative-parity yrast states in Gd 150

1977; American Institute of Physics; Volume: 16; Issue: 1 Linguagem: Inglês

10.1103/physrevc.16.120

1538-4497

Dominik Haenni, T. T. Sugihara,

Atomic and Molecular Physics

High-spin states populated by the $^{150}\mathrm{Sm}(\ensuremath{\alpha},4n)^{150}\mathrm{Gd}$ reaction have been studied by in-beam $\ensuremath{\gamma}$-ray and conversion-electron spectroscopy. Conversion-electron data for the decay of 5.8-min $^{150}\mathrm{Tb}$ to levels in $^{150}\mathrm{Gd}$ have also been obtained. The proposed level scheme for $^{150}\mathrm{Gd}$ includes 21 levels, 11 of which are previously unreported. A sequence of odd-spin negative-parity states from ${17}^{\ensuremath{-}}$ to ${3}^{\ensuremath{-}}$ carries most of the yrast-cascade intensity. This sequence is interpreted as containing two quasirotational bands. The states below ${11}^{\ensuremath{-}}$ represent a band built on an octupole vibration while those above ${11}^{\ensuremath{-}}$ constitute a band built on an $\ensuremath{\nu}({i}_{\frac{13}{2}}{h}_{\frac{9}{2}}){11}^{\ensuremath{-}}$, quasiparticle state. Other quasiparticle states arising from the $\ensuremath{\nu}({i}_{\frac{13}{2}}{h}_{\frac{9}{2}})$ and $\ensuremath{\nu}({f}_{\frac{7}{2}}{h}_{\frac{9}{2}})$ configurations are proposed.[NUCLEAR REACTIONS $^{150}\mathrm{Sm}(\ensuremath{\alpha},4n)$, ${E}_{\ensuremath{\alpha}}=45\ensuremath{-}55$ MeV and $^{152}\mathrm{Sm}(\ensuremath{\alpha},6n)$, ${E}_{\ensuremath{\alpha}}=77$ MeV; measured ${E}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}(\ensuremath{\theta})$, ${I}_{\ensuremath{\gamma}}(t)$, ${I}_{\ensuremath{\gamma}}(E)$, ${I}_{\mathrm{ce}}$, $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coin. $^{150}\mathrm{Gd}$ deduced levels, ICC, $J$, $\ensuremath{\pi}$.RADIOACTIVITY 5.8-min $^{150}\mathrm{Tb}$ [from $^{151}\mathrm{Eu}(^{3}\mathrm{He},4n)$] measured ${I}_{\mathrm{ce}}$. $^{150}\mathrm{Gd}$ deduced ICC, $J$, $\ensuremath{\pi}$. Enriched targets, Ge(Li), Si(Li) detectors.]