Investigation Of Non-statistic Fluctuation On Emission Of Target Evaporated Fragments In~4He-Em Interactions At12A Gev

Using method of scaled factorial moment, the non-statisticalfluctuation of target evaporated fragments in~4He-Em interactions at12A GeV is investigated. The distributions of emission angle andazimuthal angle and multiplicity distribution distributions of emissionangle and azimuthal angle are also studied in this paper.First, The non-statistical fluctuation of target evaporatedfragments emitted from12A GeV~4He induced emulsion targets inone-dimensional horizontal and vertical space are investigated. Itfound that, Because the non-uniformity of particle density distributionmake much influence, the result increase with the increase of thepartition of phase space, have the non-statistic fluctuation. Use thecorrected scaled factorial moments clear up the influence of particledensity distribution, show the non-statistic fluctuation.Because the emission of target evaporated fragments ishappened in three-dimensional phase space, The dimensionaldecrease will weaken the phenomenon of fluctuation, So lowerdimensional analysis can’t give a perfect conclusion. Intwo-dimensional phase space (cos space) the horizontal andvertical of the partition of phase space, there shows a trend of increase, then decrease or saturation. That is to say, the emission oftarget evaporated fragments show the non-statistic fluctuation intwo-dimensional phase space. Also think of the influence of thenon-uniformity of particle density distribution, we can use thecumulative variable to calculate the scaled factorial moments. Ittells us the corrected horizontal scaled factorial moment ln<Fq>H|â†'corrand ln<Fq>ν|â†'corrdecrease with the increase of the values of ln [δX_cosθX_φ], it tells us there is no non-statistical fluctuation.Finally we can get a conclusion that there has no non-statisticalfluctuation in experiment emission process of target evaporatedfragments in~4He-Em interactions at12A GeV. And the non-uniformityof particle multiplicity distribution leads to the non-statisticalfluctuation, not dynamic process.