نتایج جستجو برای: پروتونهای mev 69 45
تعداد نتایج: 231471 فیلتر نتایج به سال:
Linac4 is the near future 160 MeV H- linear accelerator of the CERN presently under construction. It will replace the present Linac2 as injector of the proton accelerator complex in CERN. The Linac4 is composed of a 45 keV ion source, a Low Energy Beam Transport (LEBT), a 352.2 MHz Radio Frequency Quadrupole (RFQ), which accelerates the beam to 3 MeV, and a Medium Energy Beam Transport (MEBT), ...
The masses of higher DðnLÞ and DsðnLÞ excitations are shown to decrease due to the string contribution, originating from the rotation of the QCD string itself: it lowers the masses by 45 MeV for L 1⁄4 2 (n 1⁄4 1) and by 65 MeV for L 1⁄4 3 (n 1⁄4 1). An additional decrease 100 MeV takes place if the current mass of the light (strange) quark is used in a relativistic model. For Dsð1D3Þ and Dsð2P1...
Mesoporous polyacrylonitrile (PAN) monolith has been fabricated by a template-free approach using the unique affinity of PAN towards a water/dimethyl sulfoxide (DMSO) mixture. A newly developed Thermally Induced Phase Separation Technique (TIPS) has been used to obtain the polymer monoliths and their microstructures have been controlled by optimizing the concentration and cooling temperature.
An extended version of the Cascade-Exciton Model (CEM) of nuclear reactions is applied to analyze nucleon-induced fission cross sections for Bi and Pb nuclei in the 45–500 MeV energy range. The available data on linear momentum transfer are analyzed as well. The results are compared with analytical approximations resulting from a comparative critical analysis of all available experimental data....
We study pion–nucleon scattering with a chiral lagrangian of pions, nucleons, and ∆-isobars. The scattering amplitude is evaluated to one-loop Q3 order, where Q is a generic small momentum, using a new approach which is equivalent to heavy baryon chiral perturbation theory. We obtain a good fit to the experimental phase shifts for pion center-of-mass kinetic energies up to 100 MeV. A sigma term...
The emission of light charged particles and intermediate-mass fragments ~IMF’s! from central collisions of 45 MeV/nucleon Kr with Nb has been studied. Violent collisions have been selected using the total collected charge condition. The analysis of the primary IMF excitation energies has been performed for four bins of the detected IMF charge (2,Z IMF,20). We find evidence that ~a! the mean exc...
A recent analysis of the charge (Z) correlations in the ∆Z− < Z > plane for Xe+Sn central collisions at 32 MeV/n has shown an enhancement in the production of equally sized fragments (low ∆Z) which was interpreted as an evidence for spinodal decomposition. However the signal is weak and rises the question of the estimation of the uncorrelated yield. After a critical analysis of its robustness, ...
The first excited state in neutron-rich 23 O was observed in a (2p1n) knockout reaction from 26 Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22 O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of fur...
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