Perturbirana kutna gama-gama korelacija 208.00 - 59.54 keV u 237Np

The perturbed directional 208.00 - 59.54 keV gamma-gamma angular correlation was measured in 237Np. The static hyperfine coupling between the nuclear magnetic moment and the angular momentum of the electronic states was found present both in the liquid source and in the polycrystallinic source. The spin sequence for the 208.00 → 59.54 → O keV transition was confirmed to be 3/3, 5/2, 5/2 with the mixing ratio δ = + 0.145 for the E2 admixture in the preferably M1 transition. The agreement between directional correlation and internal conversion data was shown to be fairly good. The angular momentum J of the electronic states was determined for both sources : for the polycrystallinic source the J = 1 value gives the attenuation factor G22 (t)J-1 in good agreement with the experimental results, while for the liquid source, the best J value was shown to be J = 3/2. The J-dependent hyperfine structure constant a was determined for the polycrystalinic source as a/ħ = 83 ± 3 MHz and for the liquid source as a/ ħ = 44 ± 2 MHz. The average magnetic field at the place of 237Np nuclei was deduced for the polycrystallinic source H (O)J-1 = 54 ± 14 [kOe] and for the liquid source H (O)J-3/2 = 42 ± 12 [kOe].Mjerena j e perturbirana kutna gama-gama korelacija 208.00 -59.54 keV u 237Np. Pokazano j e da perturbacija ove korelacije za vrijeme života (T1/2 = 63 ns) medijalnog 59.54 keV stanja dolazi od magnetske hiperfine interakcije između magnetskog dipolnog momenta j ezgre i kutne količine gibanja elektronskih stanja za tekući i polikristaliničan izvor. Potvrđen je niz spinova 3/2, 5/2, 5/2 za prijelaz 208.00 → 59.54 → O keV. Omjer miješanja δ = + 0,145 za E 2 primjesu u 208.00 keV u uglavnom M 1 prijelazu je u vrlo dobrom slaganju sa mjerenjima konverzionih koeficijenata. Određena je kutna količina gibanja J = 1 elektronskih stanja za izvor u polikristalnom obliku i J = 3/2 za tekući izvor. Konstanta hiperfine interakcije a (zavisna o kutnoj količini gibanja elektronskih stanja) određena je za oba izvora (u jedinicama ħ): za polikristaliničan izvor a/ ħ = 83 ± 3 [MHz], a za tekući izvor a/ ħ = 44 ± 2 [MHz] . To omogućuje izračunavanje prosječnog magnetskog polja na mjestu jezgre za polikristaliničan izvor H (O)J-1 = 54 ± 14 [kOe] i za tekući izvor H (O)J-3/2 = 42 ± 12 [kOe]

The second and third backbendings in 194Hg

High-spin states in Hg, populated via the reaction W (C, 5n), were investigated by in-beam γ-ray spectroscopy using two anti-Compton spectrometers. The level scheme was extended to considerably higher spins. A third backbend in an yrast sequence has been identified for the first time. The level structure is interpreted within the framework of the cranked shell model

High-spin structure of 190-194Hg and the cranked shell model

High-spin states in Hg, populated in the Er (Mg, xn) and W(C, xn) reactions, were investigated by in-beam γ-ray spectroscopic techniques. The level schemes in all five nuclei were extended to considerably higher spins and new band intersections were found. The band structure is interpreted within the framework of the cranked shell model. Remarkable agreement is obtained between the predictions of the model and the experimental data for these weakly oblate deformed nuclei. In Hg irregular sequences were found which could be examples of " terminating bands"