POSSIBLE MOLECULAR STRUCTURES IN THE HEAVY BARYON SPECTRUM

We use a chiral constituent quark model to study possible molecular structures in the heavy baryon spectrum. We first analyze D*N states and we find a bound state in the JP = 3/2- sector with an small binding energy. This state can be identified with the Λc(2940)+. The decays of this state are compatible with the existent experimental data. As a by product a state is predicted in the bottom baryon spectrum as a [Formula: see text] state with a mass around 6250 MeV. Moreover we also analyze other DN, D*N, DΔ and D*Δ states and their analogs in the bottom baryon sector finding several bound states.

The Improvement of Performance of HfO2/Gd2O3/Si Stack Compared with Gd-Doped HfO2 High-K Films

HfO2/Gd2O3/Si stack and Gd-doped HfO2 (GDH) High-k films have been grown on p-type Si (001) substrates by RF sputtering. The amorphous structures of GDH high k film which be grown and annealed at 700°C have been determined by HRTEM. There is a interface layer between Gd2O3 film and Si in HfO2/Gd2O3/Si stack. XPS measurement reveals that the peak shift to small binding energy for Hf4f due to the formation of Hf-O-Gd, and there are formations of gadolinium and hafnium silicate. A leakage current density of 1×10-6 A/cm2 at -1 V, a hysteresis voltage of 13 mV, a dielectric constant of 23 and a CET of 1 nm are obtained from a capacitor with Pt/HfO2/Gd2O3/Si/Ag stack through C-V and I-V measurements. In addition, the HfO2/Gd2O3/Si stack film has a higher breakdown voltage (~ 30 V) than that of GDH films.

Research on Hydrogen Induced Cracking of 08Cr2AlMo Steel Based on the Empirical Electron Theory

Hydrogen induced cracking (HIC) is one of main type of damage to metallic materials in H2S solution. 08Cr2AlMo steel is a type of material developed especially for heat exchanger pipe bundle used under H2S condition in recent years. Calculation models of the construction units in 08Cr2AlMo steel with or without hydrogen were established based on the empirical electronic theory in solid (EET) and valence electron structure of the construction units in this steel was calculated. The results show that hydrogen bond is formed between the hydrogen solved in the steel and other atoms in the steel. The cleavage energy of crystal plane with hydrogen bond is increased and that without hydrogen bond is decreased. Hydrogen results in the remarkable difference of the cleavage energy of different crystal planes and changes the bond distribution in the structure units. The mechanical property of the units has directional properties. In these units, the microcracks propagate along the cleavage plane with small binding energy and so the brittle fracture of the crystal occurs. The elements of Cr, Al, Mo are able to strengthen the basal body without carbon, and have little effect on the plastic nature. In the structure unit with carbon, carbon increases the anisotropy of mechanical property and alloying agents decrease the plastics of the steel further. The alloying agents of Cr and Mo decrease plastic nature loss of the steel due to decrement of the anisotropy of mechanical property in the unit with hydrogen. The alloying agent of Al has little effect on the loss of plastic nature.

ELECTRON GENERATION OF LEPTONS AND HADRONS WITH CONJUGATE α-QUANTIZED LIFETIMES AND MASSES

In elementary particle theories the fine structure constant α = e2/ℏc serves as the coupling constant for lepton interactions (QED), but is assumed to play no role in hadron interactions (QCD). However, experiments have long indicated an α spacing in the lifetimes of the long-lived threshold-state hadrons, and they also suggest an α-related mass structure. Lifetimes and masses are conjugate quantum mechanical variables, so the α-dependence of these two variables is a mutual property. The relevance of α to hadron interactions is an experimental question, independent of theory. In the present paper we first make a detailed analysis of the experimental lifetime data. This analysis demonstrates that out of 156 particles with well-determined lifetimes τ, the 120 short excited-state lifetimes τ<10-21 sec have a continuum of values, but the 36 long threshold-state lifetimes τ>10-21 sec occur in α-spaced groups that cleanly sort out the s, c, b quark flavors. These 36 metastable lifetimes also exhibit a factor-of-3 c-to-b "flavor structure" and a pervasive factor-of-2 "hyperfine structure." We then invoke the conjugate relationship between lifetimes and masses to trace out an α-defined set of mass quanta that tie together leptons and hadrons. Mass generation occurs via an initial "α-leap" from an electron pair to a "platform state" M, and then subsequent excitations by a dominant quantum X. The low-mass "MX octet" of particles — μ, p, τ, π, η, η′, K, ϕ — is reproduced to an average accuracy of 0.4%, with no adjustable parameters except a small binding energy for hadronic pairs. Without the inclusion of lepton masses, the spectrum of hadron masses is difficult to understand. These conjugate α-quantized results reinforce the reality of the spin 1/2 u, d, s, c, b quarks, and they also lead to the identification of a closely-related set of spinless mass quanta for the pseudoscalar mesons.

EXCITONS IN COLLOIDAL CuI PARTICLES DISPERSED IN A KI CRYSTAL

We have investigated the luminescence spectra of colloidal CuI particles dispersed in a KI crystal under low- and high-density excitations of the CuI particles at low temperatures. Under the low-density excitation, we have observed the luminescence of both confined and bulk-like exciton transitions in the CuI particles with zincblende and two kinds of hexagonal structures. In the bulk-like particles with the zincblende structure, the emission line of bound excitons with small binding energy of ~5 meV has been recognized. The biexciton luminescence has been observed under the high-density excitation. We discuss the origins of the various excitonic states observed in the CuI particles dispersed in the KI crystal.

Optical Investigations on Donor Doped CdTe

ABSTRACTThe recombination luminescence involving the A-center, a Cd vacancy paired with a nearest neighbour donor, was investigated in CdTe doped with group VII and III elements. Depending on the type of donor doping, distinct differences in the A-center acceptor binding energies and electron phonon couplings are resolved. Optically detected magnetic resonance shows that the A-center behaves as a shallow effective masstype acceptor consiscent with its small binding energy.

Eigenvalue Equations with Dressed Propagators in a Pole Regularized Spinor Theory

The massless Green's function in a pole regularized nonlinear spinor theory is dressed and the resulting eigenvalue equations are discussed. The coupling constant is more than doubled by this dressing, and the boson solutions change drastically. The old solutions disappear, a singlett deuteron solution with small binding energy appears. The fermion propagator is determined from a selfconsistency requirement.