Study of the N = 50 major shell effect toward 78 Ni at PARRNe ? : Evidence of a weak - coupling structure in 8332 Ge 51

The γ-ray de-excitations following the β-decay of Ga and the β-n decay of Ga have been studied. The radioactive species were produced using the PARRNe on-line mass-separator installed at the IPN Orsay Tandem accelerator. Two γ-lines were attributed to Ge with the aid of β-γ and γ-γ coincidences. The Z identification of the γ-lines was provided by time analysis of a buid-up/decay cycle. The excited levels of Ge can be explained by the coupling of the single neutron state ν2d5/2 to the first 2 excitation of the Ge core. PACS. 29.30.-h Spectrometers and spectroscopic techniques – 21.10.-k Properties of nuclei; nuclear energy levels – 23.20.Lv gamma transitions and level energies – 27.50.+e 59 ≤ A ≤ 89