Cosmic Neutrino Oscillation or Separation

Current experiment results show that neutrinos have non-zero masses and that different neutrino flavours may mix and undergo a transformation to each other. Neglecting matter effects for simplicity and by solving the Friedmann-Robertson-Walker geodesic equations of the time-like particle, we preparatively investigate the vacuum oscillation or separation of neutrinos on the cosmic scale.     

Why Do Deconfinement and Chiral Restoration Coincide at High Temperature？

The global colour model in free space is extended to finite temperature to study the deconfinement and chlral phase transitions at high temperature T and zero chemical potential in the mean field approximation. Both possibilities of coincidence and non-coincidence of the two distinct phase transitions are found when the model     

Phenomenon of Energy Concentration in High-Energy Family Events of Cosmic Rays

The phenomenon of energy concentration in high-energy family events of cosmic rays in studied by comparing the results of family events of total visible energies 1000-400TeV observed in the Kanbala emulsion chamber experiment with the Monte Carlo simulation data,The simulation is made by the program CORSIKA in which QGSJET is applied as the hadronic interaction model,and the chemical composition of primary cosmic rays is obtained from the rigidity-cut model and the extrapolation of new results of direct measurements.This shows that the whole distribution tendency of the rate of energy concentration of simulated family events is basically consistent with that of the experiment.     

Neutrino Mean Free Path in Strange Matter at High Temperatures

We investigate the condition that the neutrino energies E_v can be considered to be small enough to be neglected in the energy momentum conservation equation in the reactions d+v_e → u+e^- and u+e^- → d+v_e. It can be simply expressed as E_v < 4α_cμ_e/π, where α_c is the strong coupling constant and μ_e is the electron chemical potential. Then for E_v < 4α_cμ_e/π, we generalize the mean free path for nondegenerate neutrinos given by Iwamoto and obtain a formula that is valid for both nondegenerate and degenerate neutrinos. We also model the mean free path for both nondegenerate and degenerate neutrinos with energies E_v < 4α_cμ_e/π.     

H.323 Based Collaborative Environment for High Energy and Nuclear Physics

After having evaluated various H.323 products for these two years,KEK and Japanese HENP community started to move from ISDN(H.320)-based video conferencing environment into IP(H.323)-based one.Primary reason for the move is to cut down the ever increasing ISDN communication cost.At the same time the H.323 can offer us more powerful collaborative environment.In order to make KEK to be a center for the H.323-based collaborative environment in Japan,Picture Tel‘s LIVE GATEWAY as a H.320/H.323 gateway ,which is essential for the smooth transition,Cisco IP/VA 3510 as a H.323/MCU,and Cisco 2610 as a gatekeeper were installed at KEK in March 2001,And the transition started.In this paper,we‘ll describe the collaborative environment which our users can have,together with its operational results.     

更精确地研究核子

位于美国弗吉尼亚洲的ThomasJefferson国家加速器实验室的一群国际科学家们 ,共同对质子内夸克自旋是如何取向的问题进行研究 .粗略地说 ,夸克自旋可以看成是一个微小的磁棒 ,指向某一确定的方向并具有一定的强度 .有关夸克自旋的信息可提供这些基本粒子在核子 (如中子与质子 )     

Measurement of Neutron Fluxes and Spectra during the NT-TBM Operation of CN HCSB

Neutronics measurement system provides neutron fluxes and spectra at the locations of beryllium multiplier and tritium breeder during the operation of the NT-TBM （D-D and D-T phase in ITER）. This is important for studying and assessing capabilities of beryllium multiplier and tritium breeder in the China helium cooled solid breeder （CNHCSB）. A special neutron diagnostic system has been proposed that allows to measure neutron fluxes and spectra without interrupt the operation of ITER. This system includes encapsulated foil activation analysis, micro-fission chamber detectors （MFC）, and a compact neutron spectrometer using natural diamond detector （NDD）.     

Detecting Extended Technicolor Effects via the Process e^＋e^—→tt^— at High Energy e^＋e^—,Linear Collider

We calculate the corrections of extended technicolor(ETC) interactions to the asymmetry parameter ALR and the polarized parameters PL^t,PR^t of the process e^ e^-→tt- in topcolor-assisted multiscale technicolor model.our results show that the ETC efect effect on PR^t in negligibly small which can be safely ignored,and the ETC effect on ALR may be testable at high energy e^ e^- linear collider(LC),FOr 0.03≤ε≤0.1,500GeV≤s○800GeV,the relative correction of PL^t is in the range of 15%≤δPL^t/PL^t,SM≤39%,which will certainly be detected at the LC experiments(for example TESLA).     

Littlest Higgs Model and Spin Correlation of Top Quark Production at High Energy Linear e^＋e^- Colliders

Based on the littlest Higgs model, we investigate the spin correlation of the top quark pair production via the process e^＋e^- →tt at the high energy linear e^＋e^- collider （ILC） with a centre-of-mass energy √S = 800 GeV. Our numerical results show that the gauge boson ZH generates very small corrections to the spin correlation observable C in all the parameter space allowed by the electroweak data. However, with reasonable values of the free parameters, the value of the relative correction parameter RBH = （CBH-CSM）/CSM can reach 10%, which might be detected in future ILC experiments.     

Hawking Radiation of an Arbitrarily Accelerating Kinnersley Black Hole： Spin－Acceleration Coupling Effect

The Hawking radiation of Weyl neutrinos in an arbitrarily accelerating Kinnersley black hole is investigated usinga method of the generalized tortoise coordinate transformation. Both the location and temperature of the eventhorizon depend on the time and on the angles. They are in agreement with the previous results, but the thermalradiation spectrum of massless spinor panicles displays a type of spin-acceleration coupling effect.     

Molecular Dynamical Simulations on a-C：H Film Growth from C and H Atomic Flux： Effect of Incident Energy

Molecular dynamical simulation is carried out to investigate the effects of the incident energy on a-C：H film growth from C and tt atomic flux. Our simulations show that the film growth at low incident energy （1 eV） is dominated by the adsorption of H and C atoms. At moderate incident energy （10 and 20eV）, the abstraction reaction of incident H atoms with H atoms adsorbed at the surface becomes important. At high incident energy （30 and 40eV）, the a-C：H film growth is a two-step process： one is the adsorption and the shallow implantation of C atoms, and the other is the deep implantation of H atoms.     

Simultaneous X—Ray Emission Processes Indeuced by High—Energy Ion—Atom Collisions：Radiative Electron Capture

We discussed the theoretical consistency in the treatment of Xray emission processes due to the deceleration of an electron on the occasion of transfer from atom to projectile ions.The cross sections do depend on the coordinate frame employed.This unphysical feature is from the approximate formulas of three particle scattering states.We discussed a guide principle and reported some recent calculations.