S12-P12-lambshift in the n = 5 and n = 6 states of ionized helium

The S_{$\text{1}\text{2}$}-P_{$\text{1}\text{2}$}-splittings in the n = 5 and n = 6 states of He⁺ have been determined by an r.f. method to be (905.2 ± 1.0) MHz and (526.7 ± 2.5) MHz, respectively (theory: 906 and 524.2 MHz). The electric fields in the resonance cell and their dependence on the experimental parameters have been examined.     

Origin of 1ƒ noise

$\text{1}\text{?}$ noise dependence on temperature for both n- and p-type silicon has been measured. The formula for calculation of $\text{1}\text{?}$ noise is presented. The formula has been derived by presumption that only lattice scattering gives $\text{1}\text{?}$ noise. A good agreement between calculations and experimental results is found.     

On spin-52 gauge fields

We present and discuss the theory of free, massless gauge fields with spin $\text{5}\text{2}$.     

The approximation of the Fermi-Dirac integral F12 (η)

This paper presents the approximation of the Fermi-Dirac integral of order $\text{1}\text{2}$ with a relative error not exceeding 0.4% for any value of the position of the Fermi level.     

The spin 12 gravitational anomalous magnetic moment

The gravitational anomalous magnetic moment of a spin $\text{1}\text{2}$ particle is calculated and compared with an earlier dimensional regularization result. The answers disagree although both agree the answer is finite. It is argued that this quantity is not uniquely determined by physical requirements. The methods used are shown to respect the gravitational and electromagnetic gauge invariances. In addition, a physical interpretation of the regularization method employed is offered.     

Relativistic transport equation for spin 12 particles

For the model of positive energy Dirac particles with short range interaction a transport equation for the one- particle Wigner function is obtained. This transport equation is a generalization of the non-relativistic Walsmann- Snider equation for spin particles.     

Scattering of solitons with fermion number ±12

In a model of a Dirac field coupled to a sine-Gordon system, we have soliton solutions with half-integral fermion number. Scattering problems of such solitons are investigated. For soliton-soliton and soliton-antisoliton solutions, we find explicit solutions to the Dirac equations which are localized at the position of the (anti-)solitons. It is shown that the fermion number is generally transferred between the soliton and the (anti-)soliton in the scattering process.     

Phonon observations from 1ƒ noise measurements

From mobility fluctuation $\text{1}\text{?}$ noise parameter measurements five phononic energies corresponding to LO, TO vibrational modes as well as TA + S₂ or O, TO + TA, TO + O combined modes were identified. They stand for phonon replicas of non-radiative recombination processes. It is thus demonstrated that the carrier-phonon interaction is the source of $\text{1}\text{?}$ noise in semiconductors.     

Magnetic moments of 112− states in the Sn region

The relative differences of eight magnetic moments of $\text{11}\text{2}\text{?}$ states in the Sn region are excellently reproduced by first-order core polarization effects calculated with the use of experimentally known energy denominators and occupation numbers.     

The axial and trace anomalies for spin 32

The axial and trace anomalies for a real spin $\text{3}\text{2}$ field interacting with a background gravitational field, as in simple supergravity, is computed. The axial anomaly result differs from that of Van Nieuwenhuizen and Vermaseren.     

Integral representation for the spin 12 Ising ferromagnet

A simpler derivation is given for a recently discovered integral representation for the spin $\text{1}\text{2}$ Ising ferromagnet.     

Quark-tadpole origin of the ΔI = 12 rule

In the context of a two-quark field picture of current quarks and renormalized constituent quarks, we show that an s-d current-quark tadpole generated by the weak Cabbibo-GIM current appears in the current-quark nonleptonic ΔY = 1 hamiltonian. Then we demonstrate that this $\text{ΔI =}\text{1}\text{2}$ operator in fact sets the observed scale of the K_s→ππ decays without recourse to any fitted parameters.     

Quantum domain wall and coherent states for the Heisenberg-Ising spin 12 chain

It is shown that the quantum domain wall state ∣ø〉, recently found for the exchange anisotropy spin $\text{1}\text{2}$ chain, can be written as a direct product of one-site Bloch's coherent states. From this representation it follows that for this particular system of interacting spins ∣ø〉 is a minimum uncertainty packet and the correlation functions in this state factorize.     

The vibration spectra of the intercalation complexes TaS2·(pyridine)12 and NbS2·(pyridine)12

Using incoherent inelastic neutron scattering we have obtained the vibration spectra of the MS₂ ·(pyridine)_{$\text{1}\text{2}$} complexes (M = Nb, Ta) between 200 and 1000 cm^-1. The vibrations of the pyridine have been perturbed upon intercalation but in a different manner to that which occurs on Lewis complex formation. Implications of these results are mentioned.     

Production and decay properties of possible spin 32 leptons

A systematic study of production and decay properties of hypothetical charged spin $\text{3}\text{2}$ leptons is presented. These particles are assumed to occur in each lepton family. The simplest V ± A currents constructed with these particle fields and the corresponding spin $\text{1}\text{2}$ neutrinos are assumed to be coupled to the familiar V ? A lepton charged weak currents. Our results are independent from structure models and indicate ways for an experimental search for these particles.     

New superalgebra and goldstone spin-32 particle

A new supersymmetry group is introduced, whose algebra contains a spinor-vector generator. The non-linear realizations of this group lead to a Goldstone particle of spin-$\text{3}\text{2}$. The introduction of local gauge symmetry (Higgs effect) is discussed.     

The quark sea and the ΔI = 12 rule

The effect on nonleptonic processes of quark-antiquark pairs due to quantum chromodynamics is studied. Their presence improves agreement between theory and experiment for hyperon decays. In kaon decays a new $\text{ΔI =}\text{1}\text{2}$ contribution is found, but $\text{Δ =}\text{3}\text{2}$ effects are still large to to be in agreement.     

Electrical conduction and 1ƒ noise in Li-DOPED MnO

Electrical resistivity, thermoelectric power and current noise were measured on Li-doped MnO single crystals in the temperature range from 300 to 1000 K. Below 700 K the crystals are p-type and the activation energy of the resistivity is 0.75 eV. Around 700 K the activation energy changes from 0.75 to 1.25 eV owing to a change from p- to n-type conduction. The depth of the Li acceptor is found to be 0.65 eV. From resistivity and thermoelectric power data it is concluded that the bandgap in first approximation can be written as E_s(T) = E_o ? γT between 750 and 1000 K, with E_o = 1.9 eV and γ = 6 × 10^?4 eV/K. The current noise spectra show $\text{1}\text{?}$ noise. The magnitude of the $\text{1}\text{?}$ noise is strongly temperature dependent. From the noise data it is deduced that E_o = 2.2 eV and γ = 10^?3 eV/K in the temperature range 430–700 K.     

NMR relaxation at low temperature in one dimensional antiferromagnets: Comparison between S = 12 and S = 52

The proton spin-lattice relaxation time T₁ has been measured at low temperatures in spin $\text{5}\text{2}$ (CH₃)₄NMnCl₃ (TMMC) and spin $\text{1}\text{2}$ CuCl₂2NC₅H₅ (CuPC). The two systems have very different temperature dependences which we attribute to the different spin values.     

Electronic structure of the GeGaAs (111) and (111) heterojunctions

The electronic density of states for GeGaAs (111) and ($\text{1}$$\text{1}$$\text{1}$) heterojunctions has been calculated. No interface states in the fundamental gap are found. A sizeable density of interface states below the top of the valence band is found for GeGa bonds-(111) junctions-interface states in the ionic gap are reported. The effect of varying the amount of the valence band discontinuity across the interface is discussed.