[en] The negative parity energy levels of the even-even Ge isotopes with mass number between 64 and 76 are studied systematically by enlarging the model space of the interacting boson approximation model to include both collective and noncollective basis states. The basis states consist of N_B-1 sd-boson plus a f-boson configuration and N_B-1 sd boson plus a fermion pair configuration. The fermions are allowed to occupy the f_5/2 and g_9/2 single-particle orbitals, respectively. It was found that the negative parity energy levels of ^64-76Ge nuclei can be described reasonably well. The intensities of the collective configuration in 3^- states increase when going from nucleus ⁶⁴Ge to nucleus ⁷²Ge and decrease from nucleus ⁷²Ge to nucleus ⁷⁴Ge. The B(E3;3₁^-→0₁⁺) values are calculated and compared with the available observed data

No abstract available

[en] The melting point (T_m) of germanium stable isotopes ⁷²Ge, ⁷³Ge, ⁷⁴Ge, ⁷⁶Ge was determined by differential scanning calorimetry. With the increase in atomic mass of isotope the decrease in T_m is observed. The decrease was equal to 0.15 °C per the unit of atomic mass which qualitatively agrees with the value calculated by Lindemann formula accounting for the effect of “isotopic compression” of elementary cell.

No abstract available

[en] Differential cross sections and vector analyzing powers were measured at an incident deuteron energy of 12.0 MeV for the ^70727476Ge(d,p)^71737577Ge reactions. The data were compared with the predictions of the Distorted-Wave Born Approximation. From the observed j-dependence exhibited in the angular distributions of vector analyzing power, it has been possible to make spin and parity assignments from a comparison between the data and DWBA predictions. Definitive spin and parity assignments were made to 12 states in ⁷¹Ge, 18 states in ⁷³Ge, 13 states in ⁷⁵Ge and 11 states in ⁷⁷Ge. Among the 54 states studied in this work, there are 7 2P³/₂ states, 1 1F⁵/₂ state, 8 2P¹/₂ states, 5 1G⁹/₂ states, 19 2D⁵/₂ states. 1 1G⁷/₂ state, 9 3S¹/₂ states and 4 2D³/₂ states. Nineteen of these states had not been assigned, or had been assigned incorrectly in previous investigations. For each state studied, the spectroscopic factor was obtained and a simple sum rule analysis was applied to the data

No abstract available

[en] Wave functions for ground states in Ge isotopes, derived solely from fits to 2n transfer data, give a good account of the jump in proton occupation numbers between ⁷²Ge and ⁷⁴Ge, and determine the proton occupation numbers of the basic states. (orig.)

No abstract available

[en] Scattering of 31.5 MeV α-particles from the stable even Ge isotopes has been studied with an energy resolution of 15-20 keV FWHM. Angular distributions were measured for excitation energies of up to 5.2 MeV. Most of the levels are well described by collective DWBA calculations with vibrational model form factors. An implicit folding procedure was used to derive isoscalar transition rates. The distribution of the isoscalar multipole strength reveals an increasing fragmentation with increasing neutron number. A detailed comparison with the spectroscopic results of a recent (p,p') study is made. (orig.)

[en] The mass spectrometric analysis of germanium isotope by a boat-filament ion source, adding silica-gel mixture to germanium dioxide to enhance the measurable ion beam, is reported. The methods of correcting the germanium isotopic ratios for the mass fractionation and electron multiplier discrimination are described in detail. The results of natural germanium isotopic abundances are ⁷⁰Ge = 20.50%, ⁷²Ge = 27.48%, ⁷³Ge = 7.76%, ⁷⁶Gd = 36.51%, and ⁷⁶Ge = 7.75%, respectively