Abstract The photoproduction processes of the exotic Θ+(1540) baryon and the K ∗ meson from the nucleon targets, i.e., γn → K∗−Θ+ and γp → K̄∗0Θ+, are investigated in a hadronic model. We consider K and K∗ exchanges as well as the s and u channel nucleon and Θ terms. Various spin asymmetries together with cross sections are first computed in order to study the production mechanisms and the parit...

We have analysed the side-chain dihedral angles in 2536 residues from I9 protein structures. The distributions of x1 and xz are compared with predictions made OII the basis of simple energy calculations. The x1 distribution is trimodal; the qposition of the side-chain (~rans to Ha), which is rare except in serine, the t position (trams to the amino group), and the g+ position (trans to the carb...

A two-orbital model for Fe-pnictide superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, or by band structure fits, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A spin striped state is stable in a broad range of couplings in the undoped regime,...

We report on multi-epoch HST/WFPC2 images of the XZ Tauri binary, and its outflow, covering the period from 1995 to 2001. Data from 1995 to 1998 have already been published in the literature. Additional images, from 1999, 2000 and 2001 are presented here. These reveal not only further dynamical and morphological evolution of the XZ Tauri outflow but also that the suspected outflow source, XZ Ta...

Here, using density functional theory and matrix renormalization group methods, we investigate the electronic magnetic properties of RuOCl$_2$ OsOCl$_2$ with $d^4$ configurations. Different from a previous study VOI$_2$ $d^1$ configuration, these systems $4d^4$ or $5d^4$ do not exhibit ferroelectric instability along $a$-axis. Due to fully-occupied $d_{xy}$ orbital in OsOCl$_2$, Peierls distort...

A unified approach is presented for investigating coupled spin-orbital fluctuations within a realistic three-orbital model strongly spin-orbit systems with electron fillings $n=3,4,5$ in the $t_{2g}$ sector of $d_{yz},d_{xz},d_{xy}$ orbitals. generalized fluctuation propagator constructed which consistent self-consistent Hartree-Fock approximation where all Coulomb interaction contributions inv...