S. K. Soni

Internal conversion coefficients ofM4 transitions in125m, 127m, 129mTe decay

The internal conversion coefficients have been measured using a high resolution low energy Ge(Li) detector for the followingM4 transitions:125Te: 109.27keV transitionαT=357±11; RG method,127Te: 88.26 keV transitionαT=484±23; XPG method,129Te: 105.50keV transitionαT=213±10; XPG method.It is observed that these values are lower by 2.5–3.6% as compared with Hager and Seltzers calculations. A comparison between experimental and theoreticalαT andαT values for elevenM4 transitions shows that the experimental values are systematically lower.

One- and two-dimensional multifractals in varying large bin sizes

We present here detailed results on the multifractal structure analysis in one-dimensional ( eta or phi ) and two-dimensional ( eta - phi ) phase spaces for different nuclear targets in proton-emulsion nuclei interactions at 800 GeV. The multiplicity moments have a power-law dependence on the mean multiplicity in varying bin sizes in eta , phi and ( eta - phi ) spaces for different nuclear targets. The values of the generalized dimensions Dq are evaluated from the slopes for different phase spaces and targets. We find that Dq decreases with q for a given phase space and target. For fixed q the value of Dq increases with the target mass. The behaviour of Dq and the related spectrum typifies multifractality, thereby supporting a possible cascade mechanism in multiparticle production. The measure of inhomogeneity in the distribution, 1-Dq, decreases with multiplicity in an inverse ratio.

Negative binomial distributions in different pseudorapidity windows in 800 GeV proton-nucleon interactions

Experimental results on multiplicity distributions for full phase space and in different pesudorapidity windows of charged secondary particles produced in proton-nucleon collisions at 800 GeV are presented and discussed. It is found that all these multiplicity distributions are well described by negative binomial distributions. We interpret our results on the basis of clan model. The bin size dependence of multiplicity distribution of charged secondary particles in proton-nucleon interactions is analysed in terms of multifractals. The values of generalised dimensions obtained from fitted distributions show a good agreement with those obtained from the data.

Some characteristics of high multiplicity (≧45) proton-AgBr interactions at 800 GeV

Experimental results on some characteristics of high multiplicity (≧45) proton-AgBr interactions at 800 GeV are presented. The results are compared with those in lower multiplicity regions as well as for CNO target. The various parameters investigated here are pseudorapidity distribution, mean normalised multiplicity, mean number of intranuclear collisions and normalised pseudorapidity.

Factorial Correlators and Split-Bin Correlation Functions in p-Nucleus Interactions at 800 GeV

We present the first results on correlations in multiparticle production in p-nucleus interactions at 800 GeV using scaled factorial correlators and split-bin correlation functions. The behaviors of factorial correlators as a function of bin-bin distance in pseudorapidity as well as bin width is consistent with the random cascading picture of hadronization. From the analysis of the split-bin correlation functions as a function of bin-width, it is found that the two-particle dynamical correlations are due to resonance-like production mechanism.

Fractals in one and two dimensions of medium energy particles in 800 GeV p-AgBr interactions

We present the first experimental results on self-similar nature of fluctuations of one and two-dimensional density distributions of medium energy particles in 800 GeV p-AgBr interactions. The density fluctuations as measured by 1−Dq are found to be more in two dimensions as compared to those in one dimension, whereas the fluctuations decrease with increase in multiplicity. It has been found that the self-similar cascade model with multifractal properties describes well the observed fluctuations. The ratios of multifractal power law indices are found to be independent of the dimensionality of phase space and of multiplicity.