Chinese Physics C > 1994, Vol. 18 > Issue(2): 143-147

Linear Background and Nonlinear Effect in Relativistic Heavy Ion Collisions

Zhuang Pengfei^,,
Liu Lianshou

Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430070

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Abstract：
The target mass dependence, α，on the yield of charged particles as a function of pseudorapidity n has been investigated for p, ¹⁶O and ³²S induced central collisions at 200A GeV. It is pointed out that α(η)≤0.4 if we only consider the simple linear superposition of nucleon-nucleon collisions. The experimental data α→1 in the target fragmentation region show the importance of nonlinear collective effect even at present incident energy. Our results from a hydrodynamical model can describe the target mlass dependence well for different projectiles in the whole rapidity ragion.

References

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T.D.Lee,CU-TP-477（1991）.[2]Porexample,Z.Physik,C38（1988）No.1/2.[3]Forexample,B.Andersonetal,Phys.Rep,97（1983）31;A.Capella,U.Sukhatme and J.TranThanh Van,Pkys.Lett,B81（1979）68;Liu Lianshou,Meng Tachung,Pan Jicai and Peng Hongan,Phys.Rev,D33（1988）3405.[4]zhuang Pengfei and Liu Lianshou.,Z.Physik,c46（1990）535.[5]J.D.Bjorken,Phys.Rev,D27（1983）140.[6]WA80 Collaboration,R.Albrecht et al,GSI-92-27（1992）.[7]Zhuang Pengfei and Liu Lianshou,Phys.Rev,D42（1990）848.[8]L. Otterlund.S.Garpman and L. Lund,Z.Pkysik,C20（1983）281.[9]B.Anderson:G.Gustafson and B.Nilsson-Almqvist,Nucl.Phys,B281（1987）289.[10]WA80 Collaboration.R,Albrecht et al.,Phys.Lett,B202（1988）596.[11]S.Fredriksson,G.Enlam and G.Berlad,Phys.Rep.,144（1987）221.[12]K.Kajantie,R.Ratio and P.V.Ruuskanen,Nucl.Phys,B222（1983）152.[13]Zhuang Pengfei.and Liu Lianshou,Phys.Lett,B265（199）,41.

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Zhuang Pengfei and Liu Lianshou. Linear Background and Nonlinear Effect in Relativistic Heavy Ion Collisions[J]. Chinese Physics C, 1994, 18(2): 143-147.

Zhuang Pengfei and Liu Lianshou. Linear Background and Nonlinear Effect in Relativistic Heavy Ion Collisions[J]. Chinese Physics C, 1994, 18(2): 143-147. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Linear Background and Nonlinear Effect in Relativistic Heavy Ion Collisions

Zhuang Pengfei^,
Liu Lianshou

Corresponding author:Zhuang Pengfei,

Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430070

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1994-02-05

Abstract:The target mass dependence, α，on the yield of charged particles as a function of pseudorapidity n has been investigated for p,¹⁶O and³²S induced central collisions at 200A GeV. It is pointed out that α(η)≤0.4 if we only consider the simple linear superposition of nucleon-nucleon collisions. The experimental data α→1 in the target fragmentation region show the importance of nonlinear collective effect even at present incident energy. Our results from a hydrodynamical model can describe the target mlass dependence well for different projectiles in the whole rapidity ragion.