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Research   Open Access

Total cross section measurements for positron scattering from acetone

Antonio Zecca, Luca Chiari, Emanuele Trainotti, Anindya Sarkar, Michael J Brunger PMC Physics B 2010, 3:4 (7 October 2010)

Abstract | Full text | PDF

Review   Open Access

MHD flow in an insulating rectangular duct under a non-uniform magnetic field

René Moreau, Sergey Smolentsev, Sergio Cuevas PMC Physics B 2010, 3:3 (1 October 2010)

Abstract | Full text | PDF

Mini-review   Open Access

Commentary on the superconducting and magnetic properties of the ruthenocuprates

Piotr W Klamut PMC Physics B 2010, 3:2 (13 July 2010)

Abstract | Full text | PDF |  Editor’s summary

Presented in this commentary is a short discussion of the superconducting and magnetic properties of the selected compounds of rutheno-cuprates, with an emphasis given to the RuSr2GdCu2O8 compound.

Research article   Open Access

Coherently driven degenerate three-level laser with parametric amplifier

Tewodros Y Darge, Fesseha Kassahun PMC Physics B 2010, 3:1 (24 March 2010)

Abstract | Full text | PDF |  Editor’s summary

We discuss the squeezing and statistical properties of the light produced by a coherently driven degenerate three-level laser with a parametric amplifier.

Review   Open Access

Stochastic backgrounds of relic gravitons: a theoretical appraisal

Massimo Giovannini PMC Physics A 2010, 4:1 (19 February 2010)

Abstract | Full text | PDF |  Editor’s summary

Stochastic backgrounds or relic gravitons, if ever detected, will constitute a prima facie evidence of physical processes taking place during the earliest stages of the evolution of the plasma. The essentials of the stochastic backgrounds of relic gravitons are hereby introduced and reviewed.

Letter   Open Access

First evidence of new physics in b ↔ s transitions

Marcella Bona, Marco Ciuchini, Enrico Franco, Vittorio Lubicz, Guido Martinelli, Fabrizio Parodi, Maurizio Pierini, Carlo Schiavi, Luca Silvestrini, Viola Sordini, Achille Stocchi, Vincenzo Vagnoni PMC Physics A 2009, 3:6 (18 December 2009)

Abstract | Full text | PDF |  Editor’s summary

We combine all the available experimental information on Bs mixing, including the very recent tagged analyses of Bs to J/Psi phi by the CDF and D0 collaborations. We find that the phase of the Bs mixing amplitude deviates more than 3 sigma from the Standard Model prediction. This result disfavours New Physics models with Minimal Flavour Violation with the same significance.

Research article   Open Access

Near-threshold electron-impact excitation of argon studied with the time-of-flight technique

Subhendu Mondal, Julian Lower, Stephen J Buckman, Robert P McEachran, Gustavo Garcia, Oleg Zatsarinny, Klaus Bartschat PMC Physics B 2009, 2:3 (18 December 2009)

Abstract | Full text | PDF |  Editor’s summary

Absolute angle-differential cross-section data are presented for excitation of the 3p54s manifold in argon by electron impact. The investigation focuses on the near-threshold region, where previous studies have revealed persistent disparities between measurements and theoretical predictions.

Research   Open Access

Quantum cosmology of a classically constrained nonsingular Universe

Abhik Sanyal PMC Physics A 2009, 3:5 (22 October 2009)

Abstract | Full text | PDF |  Editor’s summary

The quantum cosmological version of a nonsingular Universe has been developed and the Hamilton Jacobi equation found under semiclassical (WKB) approximation. It has been pointed out that parameterization of classical trajectories with semiclassicaltime parameter for such a classically constrained system is a nontrivial task and requires Lagrangian formulation rather than the Hamiltonian formalism.

Mini-review   Open Access Highly Accessed

Four statements about the fourth generation

Bob Holdom, WS Hou, Tobias Hurth, Michelangelo L Mangano, Saleh Sultansoy, Gokhan Ünel PMC Physics A 2009, 3:4 (28 September 2009)

Abstract | Full text | PDF |  Editor’s summary

This summary of the Workshop “Beyond the 3-generation SM in the LHC era” presents a brief discussion of the fourth generation.

Research article   Open Access

He2+-He charge transfer collisions using a 27-state close-coupled calculation with a diabatic molecular basis

Chanchal Chaudhuri PMC Physics B 2009, 2:2 (9 June 2009)

Abstract | Full text | PDF |  Editor’s summary

A combined detailed analysis and comparison has been carried out to find a connection with the dynamic two-electron correlation picture in charge transfer collision processes which involve sequential/simultaneous two-electron exchange. If electron translation factors are included, the work may open up opportunities to investigate dynamic two-electron correlation effect in charge transfer ion-atom collision processes with benchmark accuracy.

Review   Open Access Highly Accessed

B meson decays

Marina Artuso, Elisabetta Barberio, Sheldon Stone PMC Physics A 2009, 3:3 (20 February 2009)

Abstract | Full text | PDF |  Editor’s summary

This review article discusses the most important Physics thus far extracted from studies of B meson decays. We also point out where CP-violating and rare decays could lead to observations of physics beyond that of the Standard Model. If such physics is found by directly observation of new particles, e.g. in LHC experiments, B decays can play a decisive role in interpreting the nature of these particles.

Research   Open Access

Universal nonlinear filtering using Feynman path integrals II: the continuous-continuous model with additive noise

Bhashyam Balaji PMC Physics A 2009, 3:2 (10 February 2009)

Abstract | Full text | PDF |  Editor’s summary

In this paper, the Feynman path integral formulation of the continuous-continuous filtering problem, a fundamental problem of applied science, is investigated for the case when the noise in the signal and measurement model is Gaussian and additive. It is shown that it leads to an independent and self-contained analysis and solution of the problem.

Mini-review   Open Access

Weinberg like sum rules revisited

Sergey S Afonin PMC Physics A 2009, 3:1 (8 January 2009)

Abstract | Full text | PDF |  Editor’s summary

The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We give a historical survey and summarize the status of these sum rules analyzing their overall agreement with phenomenological Lagrangians, low-energy relations, parity doubling, hadron string models, and experimental data.

Research article   Open Access

Electron excitation and energy transfer rates for H2O in the upper atmosphere

Penny Thorn, Laurence Campbell, Michael Brunger PMC Physics B 2009, 2:1 (2 January 2009)

Abstract | Full text | PDF |  Editor’s summary

Presented here are calculations of electron energy transfer rates for electronic and vibrational state excitations in H2O, as well as rates for excitation of some of these states by atmospheric thermal and auroral secondary electrons.

Research article   Open Access

Magnetic modulation in mechanical alloyed Cr1.4Fe0.6O3 oxide

RN Bhowmik, M Nrisimha Murty, E Sekhar Srinadhu PMC Physics B 2008, 1:20 (29 December 2008)

Abstract | Full text | PDF |  Editor’s summary

Cr1.4Fe0.6O3 compound is synthesized through mechanical alloying of Cr2O3 and Fe2O3 powders and subsequent thermal annealing. The XRD spectrum, SEM picture and microanalysis of EDAX spectrum are used to understand the structural evolution in the alloyed compound.

Research article   Open Access

Upper critical field Hc2 in Bechgaard salts (TMTSF)2PF6

Ana D Folgueras, Kazumi Maki PMC Physics B 2008, 1:19 (9 December 2008)

Abstract | Full text | PDF |  Editor’s summary

The symmetry of the superconductivity in Bechgaard salts is still unknown, though the triplet pairing has been established by Hc2 and NMR for (TMTSF)2PF6. Here we start with a low energy effective Hamiltonian and study the temperature dependence of the corresponding Hc2(T)'s.

Research   Open Access

Study of hadronic event shape in flavour tagged events in e+e- annihilation at 〈s〉 = 197 GeV

Salvatore Mele, the L3 Collaboration PMC Physics A 2008, 2:6 (8 December 2008)

Abstract | Full text | PDF |  Editor’s summary

Results are presented from a study of the structure of hadronic events in high-energy e+e- interactions detected by the L3 detector at LEP. Various event shape distributions and their moments are measured at several energy points at and above the Z-boson mass. A good description of the data is provided by the models.

Research article   Open Access

Mg spin affects adenosinetriphosphate activity

Alexander A Tulub PMC Physics B 2008, 1:18 (4 December 2008)

Abstract | Full text | PDF |  Editor’s summary

Schlegel-Frisch ab initio molecular dynamics (ADMP) (DFT:B3LYP), T = 310 K, are used to study complexation between adenosinetriphosphate (ATP), ATP subsystem, and magnesium cofactor [Mg(H2O)6]2+, Mg subsystem, in a water pool modeled with 78 water molecules. The computations prove that ATP cleavage is governed by the electron spin of Mg.

Research article   Open Access

Effect of biased noise fluctuations on the output radiation of coherent beat laser

Sintayehu Tesfa PMC Physics B 2008, 1:17 (1 December 2008)

Abstract | Full text | PDF |  Editor’s summary

The effects of biased noise fluctuations on the degree of squeezing and intensity of radiation both inside and outside the cavity of a one-photon coherent beat laser are presented.

Research article   Open Access

Evolution of structure of SiO2 nanoparticles upon cooling from the melt

Nguyen Xuan Huynh, Vo Van Hoang, Hoang Zung PMC Physics B 2008, 1:16 (30 October 2008)

Abstract | Full text | PDF |  Editor’s summary

Evolution of structure of spherical SiO2 nanoparticles upon cooling from the melt has been investigated via Molecular Dynamics simulations under non-periodic boundary conditions. Our results show significant temperature dependence of structure of nanoparticles, and we discuss the temperature dependence of the concentration of structural defects.

Research   Open Access Highly Accessed

Plasma focus based repetitive source of fusion neutrons and hard x-rays

V Raspa, F Di Lorenzo, P Knoblauch, A Lazarte, A Tartaglione, A Clausse, C Moreno PMC Physics A 2008, 2:5 (29 October 2008)

Abstract | Full text | PDF |  Editor’s summary

A plasma focus device that operates up to 0.2 Hz for several minutes is used as a source of hard x-rays and fast neutrons, for the detection of hydrogenated substances, different concentrations of water, submillimetric defects in metal, and producing clear images of metallic objects through thick iron walls.

Research article   Open Access

Effect of the applied magnetic field on formation of complex polyaniline films

Oleg P Dimitriev, Petro M Lytvyn, Alla P Dimitriyeva, Ostap M Getsko PMC Physics B 2008, 1:15 (21 October 2008)

Abstract | Full text | PDF |  Editor’s summary

It has been found that an applied magnetic field affects the interaction of polyaniline chains with paramagnetic metal ion impurities, and induces formation of magnetically ordered regions in contrast to the reference film of the same composition but prepared under ambient conditions. Correlations are found between the distribution of magnetically ordered regions and peculiarities of the surface relief of a film.

Research article   Open Access

Rectified voltage induced by a microwave field in a confined two-dimensional electron gas with a mesoscopic static vortex

D Schmeltzer, Hsuan Chang PMC Physics B 2008, 1:14 (21 October 2008)

Abstract | Full text | PDF |  Editor’s summary

We investigate the effect of a microwave field on a confined two dimensional electron gas containing an insulating region comparable to the Fermi wavelength. A Bosonized formulation of the two dimensional gas in the presence of insulating regions allows us to compute the rectified current. The proposed theory may explain experimental results recently reported by J. Zhang et al.

Editorial   Open Access

The dawn of a new era of discovery?

Ken Peach PMC Physics A 2008, 2:4 (10 September 2008)

Abstract | Full text | PDF |  Editor’s summary

Editor in Chief Ken Peach reflects upon the LHC and the questions it seeks to answer.

Research article   Open Access

Ab-initio calculations of spin tunneling through an indirect barrier

Athanasios N Chantis, Titus Sandu, Jialei L Xu PMC Physics B 2008, 1:13 (6 June 2008)

Abstract | Full text | PDF |  Editor’s summary

We use a fully relativistic layer Green’s functions approach to investigate spin-dependent tunneling through a symmetric indirect band gap barrier like GaAs/AlAs/GaAs heterostructure. Our calculations show clearly that the appearance of energy windows with significant spin polarization depends mostly on the location of transmission resonances and their corresponding zeros and not on the magnitude of the spin splitting in the barrier.

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