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The regime of multicascade proton acceleration during the interaction of a 10(21)-10(22) W/cm2 laser pulse with a structured target is proposed. The regime is based on the electron charge displacement under the action of laser ponderomotive force and on the effect of relativistically induced slab transparency which allows realization of the idea of multicascade acceleration. It is shown that a ...

The Brookhaven Relativistic Heavy Ion Collider (RHIC) has been providing collisions of polarized protons at a beam energy of 100 GeV since 2001. Equipped with two full Siberian snakes in each ring, polarization is preserved during acceleration from injection to 100 GeV. However, the intrinsic spin resonances beyond 100 GeV are about a factor of 2 stronger than those below 100 GeV making it impo...

Heavy quark production in deeply inelastic electron proton scattering (DIS) has long been recognized as a candidate process for extracting the gluon distribution in the proton because the process is almost exclusively dominated by photon-gluon fusion . The cross section for heavy quark production in DIS is given in terms of the heavy quark structure functions F2(x,Q ,m) and FL(x,Q ,m). A calcul...

Pilot innovative accelerator-based neutron source for neutron capture therapy is under construction now at the Budker Institute of Nuclear Physics, Novosibirsk, Russia. One of the main elements of the facility is lithium target, that produces neutrons via threshold (7)Li(p,n)(7)Be reaction at 25 kW proton beam with energies 1.915 or 2.5 MeV. In the present report, the results of experiments on ...

Rhythmic frq transcription is essential for the function of the Neurospora circadian clock. Here we show that there is a circadian histone occupancy rhythm at the frq promoter that is regulated by FREQUENCY (FRQ). Using a combination of forward genetics and genome sequencing, we identify Clock ATPase (CATP) as an essential clock component. Our results demonstrate that CATP associates with the f...

New, preliminary tau physics results are reported from tau-pair data acquired with the CLEO 11 detector operating at the Cornell Electron Storage Ring. The tau m~s is measured as m, = 1777.6 + 0.9 + 1.5 MeV/cz by exploiting the kinematics of events in which both taus decay hadronicdly. The electronic branching fraction is determined to be B,=O. 1742+0.0015+0.0023 by counting di-electron tau-pai...

The physics case for a possible fixed target polarized nucleon-nucleon collision experiment at HERA is described. The experiment named HERA– ~ N could be realized using an internal polarized gas target in the HERA polarized/unpolarized proton beam. A wide spectrum of nucleon spin structure problems could be investigated and the experiment would constitute a fixed target complement to the RHIC s...

Root hairs project from the surface of the root to aid nutrient and water uptake and to anchor the plant in the soil. Their formation involves the precise control of cell fate and localized cell growth. We are now beginning to unravel the complexities of the molecular interactions that underlie this developmental regulation. In addition, after years of speculation, nutrient transport by root ha...