共查询到17条相似文献,搜索用时 156 毫秒
1.
2.
3.
4.
5.
6.
通过对甘巴拉山铁乳胶室观测到的族事例以及COSMOS程序和CORSI-KA程序产生的模拟族事例进行分析、对比,对超高能γ强子族的能量集中现象的产生特征进行了细致的研究.初步的结论是:超高能γ强子族的能量集中现象是族中含有的高能中心簇射集团的外在表现,这种现象在实验上发生的频度为(20.5±3.1)%,集团的平均横向扩展约为0.37cm.与传统的以唯象多团模型为基础的COSMOS程序相比,基于SIBYLL模型的CORSIKA程序的模拟结果较为接近实验的分析结果. 相似文献
7.
8.
9.
10.
11.
E. A. Yurina N. S. Barbashina A. G. Bogdanov S. S. Khokhlov V. V. Kindin R. P. Kokoulin K. G. Kompaniets G. Mannocchi A. A. Petrukhin V. V. Shutenko G. Trinchero I. I. Yashin 《Physics of Atomic Nuclei》2019,82(6):680-684
Investigations of the energy loss of muon bundles are being conducted at the Experimental complex NEVOD. Such investigations are directed to detailed study of “muon puzzle” (the excess of multi-muon events observed in several cosmic ray experiments at ultra-high energies). Results of measurements of the muon bundle energy deposit during a long period of observations in primary cosmic ray energy range 10–1000 PeV have been obtained and have been compared with simulations performed on the basis of the CORSIKA code. 相似文献
12.
R. P. Kokoulin A. G. Bogdanov G. Mannocchi A. A. Petrukhin V. V. Shutenko G. Trinchero I. I. Yashin E. A. Yurina 《Physics of Atomic Nuclei》2019,82(6):657-662
Data on cosmic ray muon bundles accumulated at the NEVOD-DECOR complex over the period from May 2012 to December 2018 have been analyzed. Local muon density spectra at various zenith angles have been reconstructed and compared with CORSIKA-based simulations. At large zenith angles and high muon multiplicities corresponding to primary particle energies more than about 3 × 1017 eV an excess of multi-muon events compared to simulations is clearly seen. Present data are compatible with the expectation for recent LHC-adjusted hadron interaction models only under assumption of extremely heavy (iron group nuclei) primary composition. The assumption of a heavy composition is however in contradiction with other EAS observables, such as maximum depth and its fluctuations. 相似文献
13.
T. I. Mikhailova B. Erdemchimeg A. G. Artyukh G. Kaminski Yu. M. Sereda M. Colonna M. Di Toro H. H. Wolter 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(11):1511-1516
Peripheral heavy ion reactions are of interest for the production of new isotopes. In this contribution we present an investigation
of reactions of light projectiles O and Ne on Be and Ta targets at Fermi energies in the framework of transport theory. Transport
theory describes dissipative (deep-inelastic) processes, where considerable amounts of mass and energy are exchanged. The
data, on the other hand, also seem to include a more direct component with small energy loss. We separate the two components
on the basis of the velocity distribution and compare the dissipative component to the transport calculations. The primary
fragments of the transport calculation still have considerable excitation energies. For the comparison with experiment we
take into account the secondary evaporation in a statistical model. This improves the qualitative agreement with the data. 相似文献
14.
A New Simulation of Track Structure of Low-Energy Electrons in Liquid Water:Considering the Condensed-Phase Effect on Electron Elastic Scattering
下载免费PDF全文
![点击此处可从《中国物理快报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
《中国物理快报》2016,(9)
A new Monte Carlo simulation of the trade structure of low-energy electrons(10keV) in liquid water is presented.The feature of the simulation is taken into consideration of the condensed-phase effect of liquid water on electron elastic scattering with the use of the Champion model,while the dielectric response formalism incorporating the optical-data model developed by Emfietzoglou et al.is applied for calculating the electron inelastic scattering.The spatial distributions of energy deposition and inelastic scattering events of low-energy electrons with different primary energies in liquid water are calculated and compared with other theoretical evaluations.The present work shows that the condensed-phase effect of liquid water on electron elastic scattering may be of the influence on the fraction of absorbed energy and distribution of inelastic scattering events at lower primary energies,which also indicate potential effects on the DNA damage induced by low-energy electrons. 相似文献
15.
Molecular dynamics simulations of the displacement cascades in Fe-10%Cr systems are used to simulate the primary knocked-on atom events of the irradiation damage at temperatures 300,600,and 750 K with primary knockedon atom energies between 1 and 15 keV.The results indicate that the vacancies produced by the cascade are all in the central region of the displacement cascade.During the cascade,all recoil Fe and Cr atoms combine with each other to form Fe-Cr or Fe-Fe interstitial dumbbells as well as interstitial clusters.The number and the size of interstitial clusters increase with the energy of the primary knocked-on atom and the temperature.A few large clusters consist of a large number of Fe interstitials with a few Cr atoms,the rest are Fe-Cr clusters with small and medium sizes.The interstitial dumbbells of Fe-Fe and Fe-Cr are in the 111 and 110 series directions,respectively. 相似文献
16.
Experimental reflection electron energy loss (REEL) spectra are measured from aluminum for primary energies ranging from 130 eV to 2 keV. A Monte Carlo simulation is shortly described and used to calculate the same spectra. The focus is on reproducing the variable weight of surface and bulk losses as the surface sensitivity of spectra changes by changing the primary electron energy. The intensity of surface losses in the simulations is modulated by the thickness of the region where surface excitations occur. Simulations based either on a constant or an energy-dependent thickness for this layer are considered. In both cases, simulated spectra reproduce the experimental trend as a function of energy, though the correct surface-to-bulk intensity ratio for each energy is either underestimated or overestimated. 相似文献
17.
H. L. Heinisch 《辐射效应与固体损伤》2013,168(1):453-460
Abstract The processes of radiation damage, from initial defect production to microstructure evolution, occur over a wide spectrum of time and size scales. An understanding of the fundamental aspects of these processes requires a spectrum of theoretical models, each applicable in its own time and distance scales. As elements of this multi-model approach, molecular dynamics and binary collision simulations play complementary roles in the characterization of the primary damage state of high energy collision cascades. Molecular dynamics is needed to describe the individual point defects in the primary damage state with the requisite physical reality. The binary collision approximation is needed to model the gross structure of statistically significant numbers of high energy cascades. Information provided by both models is needed for connecting the defect production in the primary damage state with the appropriate models of defect diffusion and interaction describing the microstructure evolution. Results of binary collision simulations of high energy cascade morphology are reviewed. The energy dependence of freely migrating defect fractions calculated in recent molecular dynamics simulations are compared to results obtained much earlier with a binary collision/annealing simulation approach. The favorable agreement demonstrates the viability of the multi-model approach to defect production in high energy cascades. 相似文献