Niederenergetisches Neutroneneinfangs-Gammaspektrum und Niveauschema von Erbium 168

Abstract

Using the bent crystal gamma-spectrometer in Risø 211 gamma-transitions in Er 168 were measured. The low-energetic level scheme of this strongly deformed nucleus could be extended considerably. The rotational bands of the ground state and the gamma-vibrational level were found up toI=8. The negativ parity level at 1094 keV must be assigned byI=K=4 and is expected to be mostly the [521↓, +633↑] two quasineutron state. The corresponding rotational band was built up including theI=8 level. TheI=K=3 negativ parity level at 1541 keV represents very probably the [521↓−633↑] two quasineutron state. Its rotational band was found up to theI=7 level. The calculation of mixing ratios of intraband transitions yields ¦G ₄₄¦<0.2 andG ₃₃=−1.85 nuclear magnetons for the parameters of theM1-transition probability within theK=4 and theK=3 band. Theγ-transitions between these bands are well explained assuming Coriolis coupling. The band mixing is calculated from intensity ratios.