M. Shafi

Cluster Size in 400 GeV Proton-Nucleon Interactions

An experimental study has been undertaken to determine the cluster size in p-N interactions at 400 GeV. The maximum number of charged particles constituting a cluster has been observed to be four. Comparison of this finding with those obtained for 50 GeV π - -nucleus, 400 GeV p-nucleus and 1000 GeV p-N reactions earlier, leads to the conclusion that the cluster size is independent of the identity and energy of the incident hadron which indicates that the dynamics of the cluster formation and hence the mechanism of hadronization in the final stage is probably the same in both types of reactions at high energies.

On the Characteristics of Clusters Produced in 400 GeV p-N Interactions

For examining the characteristics of clusters produced in 400 GeV p-N interactions, experimental data have been analysed in terms of the predictions of various theoretical models dealing with the interactions of peripheral nature. The results reveal that the leading particle effect is more pronounced in low multiplicity events. Furthermore, about 90% of the disintegrations having multiplicities in the interval \(6{\leqslant}n_{\text{ch}}{\leqslant}10\) possess at least one cluster. Finally, on the basis of the study of short(long)-short(long) correlations, it is concluded that there might be several clusters present in an event and the cluster on an average decay into a minimum of three charged poins.

Multiparticle production in π−-emulsion collisions at 340 GeV/c

Abstract Experimental results on π − -emulsion interactions at 340 GeV/ c are presented. The dependence of R on the target mass is studied in the light of constituent quark models. A universal relation for the 〈 N s 〉 dependence on 〈 N ch 〉 and 〈 ν A 〉 is obtained. Systematics of shower multiplicity distributions are also studied and a new scaling function for integral probability distributions of shower tracks is worked out.

Multiparticle production in 24, 50 and 400 GeV/c particle-nucleus interactions

SummarySome interesting aspects of multiparticle production in 24 and 400 GeV/c p-nucleus and 50 GeV/c π--nucleus collisions have been studied. The correlations of fast target protons with evaporated and shower particles produced in these interactions have been thoroughly investigated. The results reveal that the average number of shower particles produced in these interactions is in marked disagreement with the values predicted by the simple independent-particle and hydrodynamical models. Finally, on invoking the additive quark model, the mean normalized multiplicitiesR4 andR5 are observed to be independent of the nature of the projectile indicating a new kind of scaling in hadron-nucleus interactions.RiassuntoSono stati studiati alcuni aspetti interessanti della produzione di molte particelle in collisioni p-nucleo a 24 e 400 GeV/c e π--nucleo a 50 GeV/c. Sono state studiate esaurientemente le correlazioni dei protoni veloci del bersaglio con particelle evaporate e dello sciame prodotte in queste interazioni. I risultati rivelano che il numero medio di particelle prodotte in queste interazioni è in marcato disaccordo con i valori previsti dal modello semplice delle particelle indipendenti e da quello idrodinamico. In fine, chiamando in causa il modello additivo dei quark si osserva che le molteplicità medie normalizzateR4 eR5 sono indipendenti della natura del proiettile indicando un nuovo tipo di variazione di scala nelle interazioni adrone-nucleo.РезюмеИсследуются некоторые интересные аспекты множественного рождения частиц при соударениях протонов, имеющих импульсы 24 и 400 ГэВ/с, с ядрами и π- мезонов, имеющих импульс 50 ГэВ/с, с ядрами. 0 Изучаются корреляции быстрых протонов мишени с испарительными и ливневыми частицами, образованными в этих взаимодействиях. Полученные результаты показывают, что среднее число ливневых частиц, образованных в этих взаимодействиях существенно отличается от величин, предсказанных с помощью простой модели независимых частиц и с помощью гидродинамической модели. Используя аддитивнчю кварковую модель, показывается, что средние нормированные множественностиR4 иR5 не завизят от природы налетающих частиц, что указывает на новый тип скейлинга в адрон-ядерных взаимодействиях.

Production of energetic he nuclei and tritons in 24 GeV/c proton interactions with Ag and Br nuclei

Summary708 stars withNh⩾7 have been analysed to study the production mechanism of fast He nuclei and tritons. On the basis of the

Multiplicity correlations and KNO scaling in pion-nucleus interactions

\bar D

Some Observations on Deuterons Emitted in High Energy Nuclear Interactions

-distribution for He nuclei, it has been concluded that the majority of the He nuclei in the momentum range (0.6÷1.5) GeV/c are3He. The frequencies of emission of tritons and He nuclei have been observed to be nearly equal. The shape of the energy spectrum of3He nuclei is similar to the one obtained for tritons. It has been suggested that the pick-up as well as the pion absorption by nuclear α-clusters present near the nuclear surface may be operating in the production of these particles.RiassuntoSi sono analizzate 708 stelle conNh⩾7 per studiare il meccanismo di produzione dei nuclei di He veloci e tritoni. Sulla base della distribuzione