A new cha.ra.ctenstic phenomenon of the dependen ce of long-range correlations among produced particles on the number of recoiled pro to ns f N_(p),in hadron.iiucJeus collisions at high energy is found in our investig...A new cha.ra.ctenstic phenomenon of the dependen ce of long-range correlations among produced particles on the number of recoiled pro to ns f N_(p),in hadron.iiucJeus collisions at high energy is found in our investigation by using the data of the NA5 experiments at CERN/SPS,which shows an obvious stepwise structure in the correlation strength as a function of the upper limit of Np.A model based on the concept of efFective target is proposed to explain this phenomenon.展开更多
An MRPC prototype for the future CBM-TOF inner area has been developed.The counter assembled with low resistive glass consists of 10×0.22 mm gas gaps and 2×8 readout pads.The size of each pad is 20 mm×2...An MRPC prototype for the future CBM-TOF inner area has been developed.The counter assembled with low resistive glass consists of 10×0.22 mm gas gaps and 2×8 readout pads.The size of each pad is 20 mm×20 mm with an interval of 2 mm between pads.The signals of the counter are collected by 4 eight-pin connectors.Preliminary tests performed with cosmic-rays showed an efficiency over 98%and a time resolution around 60 ps.The measured crosstalk,dark current and dark rate were at a very low levels.Results under uniform irradiation performed at JINR with high energy deuteron showed a time resolution of40–50 ps and over 98%efficiency at a low flux rate,meanwhile at a flux up to 70 kHz/cm2,93%efficiency and 77 ps time resolution still remained.These excellent performances call fully meet the demand of CBM-TOF inner wall.展开更多
The features of nuclear stopping power and multi-hadron production systematically are studied by making an analysis of rapidity distributions of pion and proton at AGS,SPS and RHIC in this work.It is found that nuclea...The features of nuclear stopping power and multi-hadron production systematically are studied by making an analysis of rapidity distributions of pion and proton at AGS,SPS and RHIC in this work.It is found that nuclear stopping power increases linearly with project rapidity yp at AGS and SPS,but that is not liner at RHIC.It is argued that the average rapidity loss is saturated at central rapidity region at RHIC.For pion distribution,it is found that the phase space of pion distribution distributes uniformly in the longitudinal direction,and a linear relationship of<βγ>L with log s is given at AGS and SPS.Non-uniform flow model may explain the features of the distribution at AGS and SPS,but may not ex-plain those of at RHIC.展开更多
基金Supported in part by National Natural Science Foundation of China,and Fok Ying Tong Foundation.
文摘A new cha.ra.ctenstic phenomenon of the dependen ce of long-range correlations among produced particles on the number of recoiled pro to ns f N_(p),in hadron.iiucJeus collisions at high energy is found in our investigation by using the data of the NA5 experiments at CERN/SPS,which shows an obvious stepwise structure in the correlation strength as a function of the upper limit of Np.A model based on the concept of efFective target is proposed to explain this phenomenon.
基金supported by the National Natural Science Foundation of China (Grant Nos. 11020101059, 10775082, and 11275108)
文摘An MRPC prototype for the future CBM-TOF inner area has been developed.The counter assembled with low resistive glass consists of 10×0.22 mm gas gaps and 2×8 readout pads.The size of each pad is 20 mm×20 mm with an interval of 2 mm between pads.The signals of the counter are collected by 4 eight-pin connectors.Preliminary tests performed with cosmic-rays showed an efficiency over 98%and a time resolution around 60 ps.The measured crosstalk,dark current and dark rate were at a very low levels.Results under uniform irradiation performed at JINR with high energy deuteron showed a time resolution of40–50 ps and over 98%efficiency at a low flux rate,meanwhile at a flux up to 70 kHz/cm2,93%efficiency and 77 ps time resolution still remained.These excellent performances call fully meet the demand of CBM-TOF inner wall.
基金Supported by the Excellent Youth Foundation of Hubei Scientific Committee(Grant No.2006ABB036)the Educational Commission of Hubei Province of China(Grant No.Z20081302)and the Natural Science Foundation of China Three Gorges Uni-versity(Grant No.2003C02)
文摘The features of nuclear stopping power and multi-hadron production systematically are studied by making an analysis of rapidity distributions of pion and proton at AGS,SPS and RHIC in this work.It is found that nuclear stopping power increases linearly with project rapidity yp at AGS and SPS,but that is not liner at RHIC.It is argued that the average rapidity loss is saturated at central rapidity region at RHIC.For pion distribution,it is found that the phase space of pion distribution distributes uniformly in the longitudinal direction,and a linear relationship of<βγ>L with log s is given at AGS and SPS.Non-uniform flow model may explain the features of the distribution at AGS and SPS,but may not ex-plain those of at RHIC.
