High-spin states of negative parity inGe69

The nucleus ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ge}$ has been studied through the reaction ${}_{}{}^{55}{}_{}{}^{}\mathrm{Mn}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$\mathrm{pn}\gamma$)${}_{}{}^{69}{}_{}{}^{}\mathrm{Ge}$ at $E_{{}_{}{}^{16}{}_{}{}^{}\mathrm{O}}=44\mathrm{}$ MeV. New levels above 3 MeV excitation energy have been found and properties of these states have been assigned from investigations of prompt $\gamma$ rays using different in-beam $\gamma$-spectroscopic techniques such as angular distributions, $\gamma \gamma$ coincidences, yield function, lifetime measurements, and linear polarization. No experimental evidence has been found for collective bands based on the $\frac{15}{2^{+}}$, $\frac{17}{2^{+}}$ doublet at 2483 keV. The nucleus entirely decays through a negative parity band of fairly long living states above 3 MeV. Similar patterns have been found earlier in the neighboring even Ge isotopes as well as in some even Zn isotopes. A speculative description of the negative parity states in terms of a few-neutron excitation associated with $\nu (1\mathrm{}{f}_{\frac{5}{2}},1\mathrm{}{g}_{\frac{9}{2}})$ configurations is attempted.