GLOBAL VARIABLES AND IMPACT PARAMETER DETERMINATION IN NUCLEUS-NUCLEUS COLLISIONS BELOW 100 MEV/U

	GLOBAL VARIABLES AND IMPACT PARAMETER DETERMINATION IN NUCLEUS-NUCLEUS COLLISIONS BELOW 100 MEV/U
	PETER, J ; CUSSOL, D ; BIZARD, G ; BROU, R ; LOUVEL, M ; PATRY, JP ; REGIMBART, R ; STECKMEYER, JC ; SULLIVAN, JP ; TAMAIN, B
刊名	NUCLEAR PHYSICS A
	1990-12-10
卷号	519 页码:611-630
ISSN号	0375-9474
英文摘要	Several global variables are tested for determining the impact parameter in 4pi-measurements of charged products. For the system Ar+Al from 25 to 85 MeV/u, simulated reactions are used to study the correlation between the real impact parameter value and the experimentally determined one. Even with a perfect detector, the total multiplicity and the mid-rapidity charge give a poor correlation. Filtering through the acceptance of an actual detector (Mur + Tonneau at GANIL) provides a poor correlation with the total charge, and an acceptable one with the total perpendicular momentum. The average (mass weighted) parallel velocity V(av) gives the best correlation is less sensitive to the incident energy and to the mechanisms used in the simulation. Measurements extending to very forward angles are needed to accurately sort events by impact parameter. Real data are used to study the variation of other global variables versus V(av): they exhibit the expected average trend, with broad fluctuations. The eccentricity and flow angle allow the evolution of central reactions with the incident energy to be followed. The proportion of relative motion transformed into energy perpendicular to the beam direction decreases when the incident energy increases; its absolute value, however, doubles from 25 to 65 MeV/u. In experimental studies where good separation between participant (pre-equilibrium) and spectator (equilibrium) particles is wanted in addition to good impact parameter sorting, the projectile mass should be in the range 1.2-2.5 times the target mass.
WOS关键词	DETECTION SYSTEM ; MULTIDETECTOR ; ARRAY
WOS研究方向	Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:A1990EP40600008
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/25789]
专题	中国科学院近代物理研究所
通讯作者	PETER, J
作者单位	1.GANIL,F-14021 CAEN,FRANCE 2.CENS,DPHN,SEPN,F-91191 GIF SUR YVETTE,FRANCE 3.LPN,F-44072 NANTES,FRANCE 4.NAPLES UNIV,DIPARTIMENTO SCI FIS,I-80138 NAPLES,ITALY 5.SUNY STONY BROOK,STONY BROOK,NY 11794 6.INST MODERN PHYS,LANZHOU,PEOPLES R CHINA 7.UNIV TSUKUBA,INST PHYS,SAKURA,IBARAKI 30031,JAPAN 8.TOKYO INST TECHNOL,DEPT PHYS,TOKYO 152,JAPAN 9.RIKKYO UNIV,TOKYO 171,JAPAN 10.UNIV SAO PAULO,INST FIS,SAO PAULO,BRAZIL
推荐引用方式 GB/T 7714	PETER, J,CUSSOL, D,BIZARD, G,et al. GLOBAL VARIABLES AND IMPACT PARAMETER DETERMINATION IN NUCLEUS-NUCLEUS COLLISIONS BELOW 100 MEV/U[J]. NUCLEAR PHYSICS A,1990,519:611-630.
APA	PETER, J.,CUSSOL, D.,BIZARD, G.,BROU, R.,LOUVEL, M.,...&MOTOBAYASHI, T.(1990).GLOBAL VARIABLES AND IMPACT PARAMETER DETERMINATION IN NUCLEUS-NUCLEUS COLLISIONS BELOW 100 MEV/U.NUCLEAR PHYSICS A,519,611-630.
MLA	PETER, J,et al."GLOBAL VARIABLES AND IMPACT PARAMETER DETERMINATION IN NUCLEUS-NUCLEUS COLLISIONS BELOW 100 MEV/U".NUCLEAR PHYSICS A 519(1990):611-630.