Pro duction of Exotic Nuclei in Low-Energy Multi-Nucleon Transfer Reactions

Multinucleon transfer processes in low-energy heavy ion collisions open a new field of research in nuclear physics, namely, production and studying properties of heavy neutron rich nuclei. This not-yet-explored area of the nuclear map is extremely important for understanding the astrophysical nucleosynthesis and the origin of heavy elements. Beams of very heavy U-like ions are needed to produce new long-living isotopes of transfermium and superheavy elements located very close to the island of stability.The calculated cross sections are high enough to perform the experiments at available accelerators.Beams of medium-mass ions (such as 136Xe, 192Os, 198Pt) can be used for the production of neutron rich nuclei located along the neutron closed shell N = 126 (the last waiting point) having the largest impact on the astrophysical r-process. The Low-energy multinucleon transfer reactions is a very efficient tool also for the production and spectroscopic study of light exotic nuclei. The corresponding cross sections are 2 or 3 orders of magnitude larger as compared with high energy fragmentation reactions.     

Dispersion of the Voigt effect in thin iron films

The dispersion characteristics of the Voigt effect in thin (<70 nm) films of Fe have been measured and interpreted in the spectral region from 0.6 to 2.8 eV.     

Model with uniquely deducible parameters for the combined analysis of two resonating vibrational states. Anharmonic resonances in molecules of asymmetric-gyroscope type

A model of an effective Hamiltonian with parameters that are uniquely deducible from the spectrum for the combined analysis of the rotational structure of two resonating vibrational states is proposed and validated. Anharmonic resonances in molecules of asymmetric-gyroscope type are considered.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 108–112, February, 1982.     

Anti-identity operations and property tensors of crystals

Within crystal physics, anti-identity operations such as $\text{1}$, the operator of spatial inversion, and θ, the operator used in allocating magnetically ordered crystals to the Shubnikov groups, play an important role. Particularly in view of the controversy that has surrounded the application of space-time formulations to the transport properties of magnetic crystals, the active and passive interpretations of anti-identity operations are contrasted. It is concluded that passive operations are irrelevant to anti-identity categorization, therefore the classification must rely upon active operations. This conclusion is highlighted by discussing an anti-identity categorization as a pre-metric, pre-basis and pre-orientation concept. The proper post-metric treatment of anti-identity operations is displayed. Finally, in order to see how the general ideas work in detail for a particular case, the property of electrical conductivity in relation to θ is considered, θ being interpreted actively as magnetic reversal.     

High-order anharmonicity parameters in various representations of the diatomic potential function and exact relations between spectroscopic constants. application to the co molecule

Closed formulae for Born—Oppenheimer anharmonicity parameters a_n in terms of isotopically invariant constants U_mj are derived for Dunham, Simons—Parr—Finlan, Ogilvie—Tipping and Thakkar representations and are applied to the CO molecule. Models for a fit of vibration—rotation and pure rotational transitions based on the exact relations U_mj = f(U_k,o, U_k-1.1) and U_mj = α(U_k,1, U_k,2) are discussed.     

Electron-electron separation in molecular hydrogen

Calculations of the mean distance and mean inverse distance between the electrons in the hydrogen molecule show that a Heitler-London wave function exhibits more correlation and a molecular orbital function less correlation than a covalent-ionic wave function. Introduction of an atomic screening constant decreases the mean distance between the electrons.     

Further studies of the electronic and vibrational spectra of ND2: Improved molecular parameters for the 000 and 010 levels of the ground state

Improved molecular parameters for the 000 and 010 levels of the $\text{X}\text{?}{}^2\text{B}{}_1$ ground state of ND₂ have been obtained by a weighted least-squares treatment using published microwave-optical double resonance frequencies, laser magnetic resonance data, infrared-optical double resonance frequencies, and extensive new optical data for the $\text{A}\text{?}{}^2\text{A}{}_1\text{-}\text{X}\text{?}{}^2\text{B}{}_1$ absorption spectrum. Revised assignments are given for 13 LMR transitions, including 4 “hot” band transitions.