摘要
报道了３０ＭｅＶ／ｕ４０Ａｒ＋１５９Ｔｂ反应中中等质量碎片发射时间随空间大小的演化规律。实验结果表明，发射空间大小对ＩＭＦ关联函数的影响主要来自于发射源的核物质密度，而几乎不依赖于源的质量数，对于发射时间较短（≤１００ｆｍ／ｃ）的高能碎片，较小的核物质密度导致提取的发射时间变小．在正常核物质密度参数下提取的发射时间可作为其上限值，对于发射时间较长的中低能碎片，发射时间不随空间大小变化，提取的发射时间值即为其实际值。
The emission time of intermediate mass fragments has been studied as afunction of spatial evolution of the source for 40Ar+159 Tb reaction at 30 MeV/u.Reduction of the mass number of source has a very small effect on the extractedemission time. For the high-energy fragments with a short emission time ≤100fm/c,a smaller nuclear density would lead to a smaller assignment for , therefore thevalues extracted in the normal nuclear density could be taken as upper limits of realvalues. For the low-energy fragments, their emission times do not vary with size ofthe source and these values could be taken as real values.
出处
《高能物理与核物理》
CSCD
北大核心
1998年第8期678-683,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
中国科学院科学基金
关键词
中等质量碎片
发射时间
核物质
重离子反应
intemediate mass fragment, correlation function, emission time, nuclearmatter density
