H.-G. Friederichs

Lifetime measurements in g92 decoupled bands

Abstract Lifetimes of positive-parity states in 71,73 As produced by the reactions 56,58 Fe( 18 O,p2n) 71,73 As have been measured by the Doppler recoil-distance method. The ratios of the measured reduced transition rates to the corresponding ones in the core nuclei 70,72 Ge can be explained by assuming that the coupling of a proton in the 1 2 [440] state increases the deformation of the core.

High spin states in75Se populated by the72Ge(α,n) and73Ge(α, 2n) reaction

The72Ge(α, n)75Se and73Ge(α, 2n)75Se reactions have been studied at bombarding energies of 15 MeV and 22.5 MeV respectively using Ge(Li)-detectors.γ-singles spectra,γ-γ-coincidences,γ-angular distributions and excitation functions have been taken. A level scheme has been constructed, which contains a stretched spin and a normal rotational band.Nuclear reactions72Ge(α, n)75Se,73Ge(α, 2n)75Se; measuredEγ,Iγ,γ-γ-coincidences,γ-angular distribution,γ-excitation function.75Se deduced levels,J, π, γ-multipolarity. Enriched target, Ge(Li).

High-spin states in112Cd from the110Pd(α, 2n γ)-reaction

AbstractThe decay scheme of112Cd has been studied by γ-ray spectroscopy with the110Pd(α, 2nγ) reaction. Spin and parity assignments were made on the basis of coincidence measurements, angular distributions and excitation functions. Twelve new energy levels were established. A vibrational-like positive-parity band up to spin 8+ and a negativeparity side band 5−, (7−), (9−) were found. For the negative-parity states a (vj, vh11/2) configuration is suggested. Nuclear Reactions:110Pd(α,2nγ),Eα=15–22.5 MeV; measuredEγ,Eγ, (E,Eγ),Eγ (θ),γ-γ- coincidence;112Cd deduced levels,J; enriched target.

High spin states in77Se populated by the74Ge(α,n γ) reaction

Abstract77Se has been investigated by the reaction74Ge(α,nγ) at 14 MeV. Gamma singles spectra, gamma angular distributions and gamma-gamma coincidences have been taken. A level scheme has been established, spins and parities have been assigned. States of a rotational band on the 1/2− ground state, a rotational band on the 5/2− 249.7 keV state and an anormal band have been identified. Nuclear Reaction74Ge(α,n γ)Eα=14 MeV; measuredEγ,Iγ,γ-γ-Coin.,γ-ang. distr.77Se deduced levels,J, π. Enriched target, Ge (Li).

Decoupled band in73As

Using the (α, 2nγ) reaction we have established a partial decay scheme of73As. A positive parity band built on the 428 keV 9/2+ level is interpreted as a decoupled band.

High spin states in95Tc populated in the93Nb(α, 2nγ) reaction

The93Nb(α, 2nγ)95Tc reaction has been studied at a bombarding energy of 22.5 MeV using Ge(Li)-detectors. Gamma singles spectra, gamma-gamma coincidences, excitation functions and gamma angular distribution have been obtained. A level scheme has been constructed. Spin and parity assignments up to 29/2+ are given.