Shallow Binding Energy Research Articles

Characterization of point defects in CdTe by positron annihilation spectroscopy

Positron lifetime measurements on CdTe 0.15% Zn-doped by weight are presented, trapping to monovacancy defects is observed. At low temperatures, localization at shallow binding energy positron traps dominates. To aid defect identification density functional theory, calculated positron lifetimes and momentum distributions are obtained using relaxed geometry configurations of the monovacancy defects and the Te antisite. These calculations provide evidence that combined positron lifetime and coincidence Doppler spectroscopy measurements have the capability to identify neutral or negative charge states of the monovacancies, the Te antisite, A-centers, and divacancy defects in CdTe.

VARIATIONAL CALCULATION OF K-pp WITH CHIRAL SU(3)-BASED $\bar KN$ INTERACTION

The prototype of a [Formula: see text] nuclear cluster, K-pp, has been investigated using effective [Formula: see text] potentials based on chiral SU (3) dynamics. Variational calculation shows a bound state solution with shallow binding energy B(K-pp) = 20 ± 3 MeV and broad mesonic decay width [Formula: see text]. The [Formula: see text] pair in the K-pp system exhibits a similar structure as the Λ(1405). We have also estimated the dispersive correction, p-wave [Formula: see text] interaction, and two-nucleon absorption width.

Chiral SU(3) dynamics and the quasibound K – pp cluster

The prototype of a Kbar nuclear cluster, K^-pp, has been investigated using effective KbarN potentials based on chiral SU(3) dynamics. Variational calculation shows a bound state solution with shallow binding energy B(K^-pp)=20 \pm 3 MeV and broad mesonic decay width \Gamma(KbarNN -> \pi Y N)=40 - 70 MeV. The KbarN(I=0) pair in the K^-pp system exhibits a similar structure as the \Lambda(1405). We have also estimated the dispersive correction, p-wave KbarN interaction, and two-nucleon absorption width.

Variational calculation of [formula omitted] with Chiral SU(3)-based [formula omitted] interaction

The prototype of a K ¯ nuclear cluster, K − p p , has been investigated using effective K ¯ N potentials based on chiral SU(3) dynamics. Variational calculation shows a bound state solution with shallow binding energy B ( K − p p ) = 20 ± 3 MeV and broad mesonic decay width Γ ( K ¯ N N → π Y N ) = 40 − 70 MeV . The K ¯ N ( I = 0 ) pair in the K − p p system exhibits a similar structure as the Λ ( 1405 ) . We have also estimated the dispersive correction, p-wave K ¯ N interaction, and two-nucleon absorption width.

Electronic structure of (TaSe 4) 2I studied by positron annihilation and Ultraviolet Photoemission Spectroscopy (UPS)

The electronic structure of (TaSe 4) 2I has been studied by positron annihilation experiment and ultraviolet photoemission spectroscopy (UPS). By positron study, the Fermi surface is observed only for the high conducting c-axis direction, elucidating the one-dimensionality of the electronic structure. The Fermi wave vector k F is also determined. By UPS study, it is found that the hybridization of Ta 5d orbitals with Se 4p orbitals is remarkable at shallow binding energies in the valence bands.