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[en] The isotopic composition of tellurium in meteoritic and terrestrial materials was measured using a solid source mass spectrometer. The relative isotope abundances for terrestrial tellurium are 0.00284, 0.07701, 0.02687, 0.14250, 0.21122, 0.56073 and 0.93753 for 120Te, 122Te, 123Te, 124Te, 125Te, 126Te 128Te relative to 130Te, respectively. Apart from linear mass fractionation these data are in agreement with other published data. Tellurium is unique in that it is the only element which possesses three s-only process nuclides. A comparison of the isotopic composition of 8 meteorites with the terrestrial data did not reveal any evidence of rapid and slow neutron capture process anomalies. (Auth.)
[en] The density dependent point coupling and meson exchange effective interactions are employed in the relativistic Hartree-Bogoliubov (RHB) model to study the development of ground state deformation and occurrence of shape transitions with change of neutron number in 104−144Te isotopes. Besides this, the systematics of other nuclear structure properties with increasing neutron number are also obtained. The RHB model reproduces well the available experimental data on binding energies, quadrupole deformation parameters, two neutron separation energies and root mean square charge radii. The results of three-dimensional potential energy surfaces predict prolate ground state minima for proton rich and neutron rich tellurium isotopes, oblate minima for 114−124Te, triaxial minima for 126,128Te and spherical minima for 130−134Te. Besides, oblate prolate shape coexistence is predicted in 116−120Te isotopes.
[en] Laser spectroscopy based on resonant ionization of laser-desorbed atoms has been used to study the neutron-rich tellurium isotopes with the COMPLIS facility at ISOLDE-CERN. Isotope shifts and hyperfine structures of several neutron-rich Te isotopes: 120-136Te and 123m-133mTe have been measured. From the hyperfine structure we have extracted magnetic and quadrupole moments. Changes in the mean square charge radii have been deduced and their comparison with the known data for the other elements near Z = 50 is presented. The experimental δ < r2> values are compared with those obtained from relativistic mean field calculations.
[en] The thermal neutron cross sections and resonant integrals for (n,γ)-reactions resulting in the production of tellurium isomers were measured by the cadmium difference method. The isomeric ratios for the thermal neutron reactions proved to be the same within the limits of errors for cases for the 127m Te it turned to be markedly lower
[en] The high spin investigations in 115-119Te have been performed using the pelletron accelerator and multidetector array facilities available at NSC, New Delhi and TIFR, Bombay. The level Structures have been established on the basis of intensity/coincidence relations, DCO ratios and angular distribution measurements. The present results reveal the following new interesting features: (a) The bands observed in 116-118Te nuclei are due to coupling of π[g-29/2g27/2] deformed states of even A-2Sn core with two valence protons. (b) Nearly rigid rotational bands (J/Jrigid= 0.85) have been observed for the first time in 116,118Te nuclei. (c) The 116,118,119Te nuclei exhibit single particle characteristics at high spins. (d) The ΔI=1, E2 transitions have been observed at high spin in 118,119Te, which indicate a possible structural change. These features will be discussed therein
[en] The cross sections for the absorption of thermal neutrons and the resonant integral for (n, γ) reactions leading to the production of the tellurium isomers 123m,125m,127m,129mTe are measured by the cadmium difference method. A large difference between the measured cross section for the adsorption of thermal neutrons and its tabular value is discovered for 125mT. To within the experimental errors, the isomeric ratios for reactions involving thermal neutrons are the same for 123m,125m,129mTe, while the value obtained for 127Te is found to be much smaller. 13 refs., 3 figs., 4 tabs
[en] New values for thermal neutron capture cross sections of the tellurium isotopes 122Te,124Te,125Te,126Te,128Te, and 130Te are reported. These values are based on a combination of newly determined partial γ-ray cross sections obtained from experiments on targets contained natural Te and γ intensities per capture of individual Te isotopes. Isomeric ratios for the thermal neutron capture on the even tellurium isotopes are also given