نتایج جستجو برای: geant
تعداد نتایج: 218 فیلتر نتایج به سال:
We review the software tools in High Energy Physics which may also be appropriate for use in the field of Cosmic Ray Physics. We describe the status and future plans for Object-Oriented (OO) Data Storage and Access; Event and Detector simulation, including physics generators and GEANT4; and the HEP class libraries for generic tasks such as data presentation, statistical and numerical analysis, ...
by MARY ELIZABETH CONVERY MiniMax (Fermilab T-864) was a small test/experiment at the Tevatron designed to search for disoriented chiral condensates (DCC) in the forward direction. Relativistic quantum field theory treats the vacuum as a medium, with bulk properties characterized by long-range order parameters. This has led to suggestions that regions of " disoriented vacuum " might be formed i...
The NA49 experiment has measured φ production in central Pb+Pb collisions at the CERN SPS at beam energies from 20 to 158 AGeV. We present preliminary results on the energy dependence of tranverse spectra as well as of the mean multiplicities. . Strangeness production in heavy-ion collisions is believed to give insight into the collision dynamics. The φ meson is of special interest due its s-an...
یکی از مهمترین شاخصههای کیفیت درمان در روش پرتودرمانی ریز باریکهای (MRT)، نسبت دز قله به دره (PVDR) است. این پارامتر، معیاری برای سنجش میزان نابودی سلولهای سرطانی و حفظ سلولهای سالم موجود در ناحیهی تومور و اطراف آن میباشد. هدف از این تحقیق، مطالعهی تأثیر استفاده از نانو ذرات طلا و گادولینیم به عنوان عامل فعالساز در توزیع دز و پارامتر PVDR میباشد که در آن، پرتودهی بافت موردنظر با ریزبا...
We present a detailed simulation of the performance of water Cerenkov detectors suitable for use in the Pierre Auger Observatory. Using geant4, a flexible object-oriented simulation program, including all known physics processes, has been developed. The program also allows interactive visualization, and can easily be modified for any experimental setup.
The engineering radiation monitor (ERM) measures dose, dose rate, and charging currents on the Van Allen Probes mission to study the dynamics of Earth’s Van Allen radiation belts. Measurements from this monitor show a variation in dose rates with time, a correlation between the dosimeter and charging current data, a map of charging current versus orbit altitude, and a comparison of measured cum...
NA44 has measured mid-rapidity deuteron spectra from AA collisions at √ snn ≈ 18 GeV at the CERN SPS. Combining these spectra with published p, p̄ and d̄ data allows us to calculate, within a coalescence framework, p and p̄ source sizes and phase space densities. These results are compared to π source sizes measured by Hanbury-Brown Twiss, HBT, interferometry and phase densites produced by combini...
Open charm will be one of the key observables of the future CBM experiment, as it is a penetrating probe of the early dense phase of the collision. In particular, its elliptic flow should be sensitive to the degrees of freedom of the medium at the early stage. In a purely hadronic scenario, open charm has a moderate interaction rate and should develop a low elliptic flow compared to lighter had...
Proton and deuteron mT spectra and rapidity densities at y = 1.9− 2.3 are presented for central SS, SPb and PbPb collisions. The inverse slopes increase with system size and mass. The radius parameter, RG, extracted from ratios of the spectra increases with system size. RG ∝ 1/ √ mT consistent with transverse flow and NA44’s HBT results. Experiment NA44 NA44 measures particle spectra and correl...
In this article we aim to describe the project developing the Migrating Desktop infrastructure for itinerants in a simple way. We also focus on the development testbed, which is prepared for the testing purposes of the runtime environment This functionality refers to the work environment of the users which change their location very often. The Roaming Access (RAS) infrastructure is the set of m...
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