Untersuchung des niveauschemas von 177Lu in der (n, γ) reaktion

Abstract

The level scheme of 177 Lu has been studied in the (n, γ) reaction up to excitation energies of about 2.2 MeV. The singles γ-ray spectrum and γγ coincidences have been measured using Ge(Li) detectors, and conversion electrons have been measured up to 2.2 MeV with a β-spectrograph. Many levels above 1.2 MeV were found to be excited directly from the capture state at 7070.8 keV. The de-excitation of these levels to lower rotational bands was investigated. The positions of the Nilsson orbitals 1 2 − [541], 7 2 − [523] and the γ-vibrational state ( K 0 −2) associated with the 7 2 + [404] state are discussed. The rotational bands of the states 7 2 + [404], 9 2 − [514] , 5 2 + [402] and 1 2 + [411] are discussed in terms of a rotational formula. The quantities Q 0 , g and ( g k - g r ) 2 / Q 0 2 have been deduced.