Band structure on the low-j orbitals in the nucleus125Xe

In¹²⁵Xe eight lowlying band structures of positive parity were established via the¹²²Te(α, n) reaction by means of in-beamγ-ray spectroscopy using a setup of 6 compton suppressed germanium detectors. The systematics of the related quasi- ′s′_1/2, ′d′_3/2, and ′g′_7/2 bands with the variation of the fermi level in the triaxially deformed region from¹²⁵Xe to¹²⁹Xe is discussed.     

Evidence for band termination in118Xe

The yrast band of¹¹⁸Xe has been extended up to tentativelyI ^π = 34⁺ in a heavy-ion in-beam γ-spectroscopic study using the NORDBALL detector array. A band crossing is observed at the highest spins and interpreted within the Modified Oscillator Model as a transition to a terminating band.     

High-spin bands in117,119I and118Xe

Excited states in¹¹⁷I,¹¹⁸Xe and¹¹⁹I were populated in the reactions¹⁰⁶Pd+¹⁶O and^{108, 110}Cd+¹²C. The groundstate band in¹¹⁸Xe was observed to its (18⁺) member and the 11/2^? bands in¹¹⁷I and¹¹⁹I to their (35/2^?) and (43/2^?) members, respectively. The structure of the bands in the I isotopes is interpreted as aπ h _11/2 proton coupled to an even-even band structure in Xe, and the band crossings observed in¹¹⁸Xe and¹¹⁹I are interpreted in the Cranked Shell Model framework asAB _n ofv h _11/2.     

The breaking of O(6) symmetry in 118Xe and 120Xe

The spectra of the isotopes of xenon are analysed from the point of view of O(6) symmetry breaking. It is pointed out that the excitation energies of the states 0 ₃ ⁺ can be used in detecting breaking of the symmetry. The nature of symmetry breaking in ¹¹⁸Xe and ¹²⁰Xe is indicated.     

Effective dynamic moment of inertia of 118Xe and 130Ba

The effective moment of inertia J_eff⁽²⁾ of ¹¹⁸Xe and ¹³⁰Ba has been measured using sum-spectrometer techniques. The data are discussed using arguments based on particle alignments and results of cranking calculations. J_band⁽²⁾ and J_eff⁽²⁾ are compared in order to estimate the contribution of particle alignments to the total increase in angular momentum.     

Study of the124Xe and126Xe structure

The level structure of¹²⁴Xe and¹²⁶Xe is studied on the basis ofβ ⁺ decay of¹²⁴Cs and¹²⁶Cs. The Cs isotopes were produced in the Xe(p, n) Cs reactions at a proton energy ofE≈9.5 MeV. Decay schemes are proposed for these nuclei. The available experimental data are compared with the predictions of various models.     

High spin structure in127Xe and125Xe

Excited states of the nuclei¹²⁷Xe and¹²⁵Xe have been investigated in the inverse kinematic reactions⁴⁸ Ca(⁸² Se,(3.5)n) at 275 MeV beam energy with the OSIRIS multidetector system at the VICKSI-accelerator of the HMI Berlin. The level scheme of¹²⁷Xe was extended up to a level of tentative spin (51/2^?). Two excited bands of 3QP-character were observed. For¹²⁵Xe these structures were extended towards higher spins. Experimental Routhians of selected bands are presented.     

Low spin structure of128Xe

The low spin structure of¹²⁸Xe has been studied by means of the (α,n) reaction using beam energies near the Coulomb barrier. An extended level scheme with spins I≤10? and many new spin and parity assignments could be established. The results point to the completeness of the reaction at low spins and excitation energies below 2.5 MeV.     

Band structure of InN

The energy band structure of wurtzite-structure semiconductive InN is predicted using empirical nearest-neighbor tight-binding theory. The tight-binding parameters are extrapolated from those of zincblende InP, InAs, and InSb by using empirical rules for the dependences of the parameters on bond length and on row of the Periodic Table. The predicted band gap is direct and agrees well with the data for this potential orange light-emitter. It is suggested that zincblende InN, if it can be grown, also will have a band-gap near 2 eV.     

Band structure of AlSb

A combination of the pseudopotential method with thek. p method was used to calculate the complete band structure of AlSb. The pseudopotential form factors were determined by fitting to reliably assigned optical transition energies. Optical critical points and effective masses were evaluated and compared with experimental data so far as possible.This work was performed in the Arbeitsgemeinschaft A_IIIB_V-Halbleiter of the Karl-Marx University Leipzig. The authors are indebted to Dr. K.Unger for stimulating discussions.     

Band structure in104Ag

The level structure of¹⁰⁴Ag has been studied through the¹⁰³Rh (α, 3nγ) reaction at E_α=40 and 45 MeV. The principal features of the proposed level scheme are in agreement with those obtained earlier through heavy ion reaction. Two quasiparttcle-plus-rotor model calculation has been performed, and the results are compared with experimental data.     

Band structure and thermodynamic potentials

The behavior of different thermodynamic functions of a system of delocalized electrons in a crystal is considered in the single-band strong coupling approximation depending on the degree of energy band filling and temperature. The chemical potential, grand thermodynamic potential, internal energy, free energy, entropy, and heat capacity are numerically calculated. Dependences of these quantities on the electron concentration at high temperatures are investigated. Their limited energy spectrum leads to the special features in the behavior of these quantities in comparison with the free electron gas.     

Band structure from random interactions

The anharmonic vibrator and rotor regions in nuclei are investigated in the framework of the interacting boson model using an ensemble of random one- and two-body interactions. We find a predominance of L(P) = 0(+) ground states, as well as strong evidence for the occurrence of both vibrational and rotational band structures. This remarkable result suggests that such band structures represent a far more general (robust) property of the collective model space than is generally thought.     

Band structure of cubic NaxWO3

The band structures of cubic WO₃ and NaWO₃ have been calculated, and they are shown to be nearly identical, demonstrating the validity of the rigid band model for different sodium concentrations. To elucidate the nature of the bonding, the density of states is decomposed into its s, p, and d contributions from each atomic site.     

Band structure of transition metal compounds

The article is a review of band-structure calculations for transition metal compounds (carbides and nitrides, layer compounds, A15 structures, and others).     

Band structure of one-dimensional random alloys

A one-dimensional random alloy with an original tight-binding model is considered. Impurities are represented by δ-type attractive potentials. An analytical expression for the density of states is obtained.