Theoretical Study on Rotational Bands and Shape Coexistence of 183,185,187^{183,185,187}{Tl} in the Particle Triaxial-Rotor Model

By taking the particle triaxial-rotor model with variable moment of inertia, we investigate the energy spectra, the deformations and the single particle configurations of the nuclei $^{183,185,187}$Tl systemically. The calculated energy spectra agree with experimental data quite well. The obtained results indicate that the aligned bands observed in $^{183,185,187}$Tl originate from the $[530]{{1/2}}^{-}$, $[532]{{3/2}}^{-}$, $[660]{{1/2}}^{+}$ proton configuration coupled to a prolate deformed core, respectively. Whereas, the negative parity bands built upon the ${{9/2}}^{-}$ isomeric states in $^{183,185,187}$Tl are formed by a proton with the $[505]{{9/2}}^{-}$ configuration coupled to a core with triaxial oblate deformation, and the positive parity band on the ${{13/2}}^{+}$ isomeric state in $^{187}$Tl is generated by a proton with configuration $[606]{{13/2}}^{+}$ coupled to a triaxial oblate core.Comment: 16 pages, 5 figures. To appear in Physical Review

Anaesthetic effects of xylazine combinations in high and low concentrations of tiletamine-zolazepam, with and without ketamine, in cats

Intramuscular (1M) administration of four anaesthetic combinations were evaluated on nine cats ina repeated manner. The anaesthetic regimens were: (i) 2 mg/kg tiletamine, 2 mg/kg zolazepam, 3.2 mg/kg ketamine and 0.8 mg/kg xylazine (T₄KX); (ii) 1 mg/kg tiletamine, 1 mg/kg zolazepam, 3.2 mg/kg ketamine and 0.8 mg/kg xylazine (T₂KX); (iii) 2 mg/kg tiletamine, 2 mg/kg zolazepam and 0.8 mg/kg xylazine (T₄X); and (iv) 1 mg/kg tiletamine, 1 mg/kg zolazepam and 0.8 mg/kg xylazine (T2X). All four combinations induced smooth recumbency within 4 minutes following IM administration and enabled intubation. All four anaesthetic combinations caused an immediate increase in heart rate and a dramatic decrease in respiratory rate. Pale to slight cyanotic mucous membrane was observed in most cats, 5 minutes following administration of any of the anaesthetic combinations. The T₄KX combination provided the longest duration of anaesthesia, followed by T₂KX, T₄X and T₂X, Time from IM injection to righting reflex, sternal recumbency, and standing or walking, was longest after administration of T₄KX, followed by T₄X, T₂X and T₂KX. Quality of recovery from anaesthesia was better following T₂X and T₂KX administration compared to T₄X and T₄KX. This study demonstrates the benefits of adding ketamine in the anaesthetic combination to reduce the tiletaminezolazepam component. The data in this study can be used to compare and choose an initial IM TKX induction dose for short and non-invasive procedures in cats

Semi-leptonic and Non-leptonic BB meson decays to charmed mesons

We study the semi-leptonic and non-leptonic $B$ weak decays which are governed by the $B\rightarrow D^{(*)}$ transitions. The branching ratios, CP asymmetries (CPA) and polarization fractions (FA) of non-leptonic decays are investigated in the factorization approximation. The $B\rightarrow D^{(*)}$ form factors are estimated in the Salpeter method. Our estimation on branching ratios generally agree with the existent experimental data. For CPA and polarizations, comparisons among the FA results, the perturbative QCD predictions and experimental data are made.Comment: 8 pages, 1 figures, 5 table

Deterministic and Efficient Quantum Cryptography Based on Bell's Theorem

We propose a novel double-entanglement-based quantum cryptography protocol that is both efficient and deterministic. The proposal uses photon pairs with entanglement both in polarization and in time degrees of freedom; each measurement in which both of the two communicating parties register a photon can establish one and only one perfect correlation and thus deterministically create a key bit. Eavesdropping can be detected by violation of local realism. A variation of the protocol shows a higher security, similarly to the six-state protocol, under individual attacks. Our scheme allows a robust implementation under current technology.Comment: 4 pages, 1 figure; published version with a note adde

Strongly Asymmetric Tricriticality of Quenched Random-Field Systems

In view of the recently seen dramatic effect of quenched random bonds on tricritical systems, we have conducted a renormalization-group study on the effect of quenched random fields on the tricritical phase diagram of the spin-1 Ising model in $d=3$. We find that random fields convert first-order phase transitions into second-order, in fact more effectively than random bonds. The coexistence region is extremely flat, attesting to an unusually small tricritical exponent $\beta_u$; moreover, an extreme asymmetry of the phase diagram is very striking. To accomodate this asymmetry, the second-order boundary exhibits reentrance.Comment: revtex, 4 pages, 2 figs, submitted to PR