Single - particle correlations in events with the total disintegration of nuclei

TL;DR

This paper presents new experimental data on single-particle correlation functions in nuclear disintegration events, revealing how correlations vary with emitted nucleons and projectile mass, especially noting their weakening with larger nuclei.

Contribution

It provides the first detailed analysis of the dependence of two-dimensional correlation functions on emitted nucleons and projectile mass in nuclear disintegration.

Findings

Correlations are weak and primarily linked to transverse momentum.

Correlations weaken as projectile mass increases.

The nature of correlations changes with the number of emitted nucleons.

Abstract

New experimental data on the behaviour of the single-particle two-dimensional correlation functions R versus Q (Q is the number of nucleons emitted from nuc- lei) and Ap (Ap is the mass of projectile nuclei) are presented in this paper. The interactions of protons, d, 4He and 12C nuclei with carbon nuclei (at a momentum of 4.2 A GeV/c) are considered.The values of R are obtained separately for pi minus mesons and protons.In so doing,the values of R are normalized so that -1=<R=<1.The value of R=0 corresponds to the case of the absence of corre- lations.It has been found that the Q- and Ap-dependence of R takes place only for weak correlations (R< 0.3).In the main (90 %),these correlations are con- nected with the variable pt and have a nonlinear character, that is the regi- ons with different characters of the Q-dependence of R are separated: there is a change of regimes in the Q-dependences of R.The correlations weaken with increasing Ap, and the variable R gets the least values of all the considered ones in 12CC interactions.Simultaneously with weakening the correlations in the region of large Q, the character of the Q-dependence of R changes.