نتایج جستجو برای: protons
تعداد نتایج: 22490 فیلتر نتایج به سال:
means that it is possible to create high-energy beams of unstable nuclei. There is potentially an enormous range of radioactive nuclear beams available to induce nuclear reactions, to create nuclei with increasingly exotic combinations of neutrons and protons. This is already beginning to transform the field of nuclear physics, enabling physicists to address many outstanding questions. Bazin’s ...
Correlations between leading protons, produced in proton collisions and large pI particles and between leading protons and massive lepton pairs are studied using the quark parton model. The leading proton production is described according to a valence quark recombination mechanism, large pI jets are produced by the hard scattering of quark partons and lepton pairs are produced according to the ...
The [FeFe] hydrogenase HydA1 from Chlamydomonas reinhardtii has been studied using 1H NMR spectroscopy identifying the paramagnetically shifted 1H resonances associated with both the [4Fe-4S]H and the [2Fe]H subclusters of the active site "H-cluster". The signal pattern of the unmaturated HydA1 containing only [4Fe-4S]H is reminiscent of bacterial-type ferredoxins. The spectra of maturated HydA...
Previous ENDOR studies on reaction centers from Rhodopseudomonas sphaeroides have shown the presence of two hydrogen-bonded protons associated with the primary, ubiquinone, acceptor Q(A). These protons exchange with deuterons from solvent (2)H(2)O. The effect of this deuterium substitution on the charge-recombination kinetics (BChl)(2) (+)Q(A) (-) --> (BChl)(2)Q(A) has been studied with a sensi...
The acceleration of light ions (protons) through the interaction of a high-power laser pulse with a double-layer target is theoretically studied by means of two-dimensional particle-in-cell simulations and a one-dimensional analytical model. It is shown that the maximum energy acquired by the accelerated light ions (protons) depends on the physical characteristics of a heavy-ion layer (electron...
A beam of MeV protons, accelerated by ultraintense laser-pulse interactions with a thin target foil, is used to investigate nuclear reactions of interest for spallation physics. The laser-generated proton beam is shown (protons were measured) to have a broad energy distribution, which closely resembles the expected energy spectrum of evaporative protons (below 50 MeV) produced in GeV-proton-ind...
Proton acceleration at a parallel coronal shock is modeled with self-consistent Alfvén wave excitation and shock transmission. 18 50 keV seed protons at 0.1% of plasma proton density are accelerated in 10 minutes to a power-law intensity spectrum rolling over at 300 MeV by a 2500km s−1 shock traveling outward from 3.5r , for typical coronal conditions and low ambient wave intensities. Interacti...
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