Many-particle rapidity correlations in light-ion interactions at the CERN intersecting storage rings

Many-particle rapidity correlations have been studied for αα,dd, andpp interactions at the CERN Intersecting Storage Rings using the Split-Field Magnet detector, and basing the investigating on the distributions of rapidity gaps between particles. In the framework of a simple cluster model, it is found that all the data samples have similar features and that the events contain clusters of two different types.     

Theg-factor of the 19/2− isomeric state in115Sb

The probability of forming 1sσ vacancies in collisions with impact parameters b ? 60 fm was measured using the x-ray-scattered-particle-coincidence method. The probability falls off monotonically with b, in qualitative agreement with calculations of Soff et al.     

The nuclear response in high-energy hadron-nucleus interactions

In an experiment at the CERN Super Proton Synchrotron (SPS) studying hadron-nucleus interactions, slow particles which are mainly knockout protons were measured with an electronic detector. Their dependence on the target mass, incoming energy, and projectile is shown. We discuss the use of the number of protons as a measure for the number of interactions of the projectile and conclude that the emitted protons measure the impact parameter of the reaction.     

Particle production in high-energy hadron-nucleus interactions

The pseudorapidity (η) distributions of fast particles (β>0.7) emitted in inelastic hadron interactions with carbon, copper and lead were measured for incoming energies from 50 to 150GeV at the CERN Super Proton Synchrotron. Their dependence on target mass (A) and projectile (h) obeys <v>-scaling as expected. Their energy dependence is in contrast with most model predictions.     

Evidence for directp p interactions in the fragmentation channelp +α →p + pX at √s=88 GeV

We have investigated kinematical correlations between the outgoing beam proton and the proton emerging from the fragmentingα-particle inpα collisions at \(\sqrt {s_{p\alpha } } = 88GeV\) . Strong correlations are seen, indicating the dominance of quasi-elasticpp scattering in the fragmentation channelp+α→p+pX, for the ¦t¦ range 0.05–1.00 (GeV/c)². A Monte Carlo simulation of this process can explain the observed correlation spectra assuming an admixture of about 16% spectator protons.     

Excited states of the odd-A Sb isotopes115,113,111Sb

Properties of excited states in^111,113,115Sb were investigated with the (p, 2n) reaction. Singles-ray spectra, neutron-gamma- and gamma-gamma coincidences, excitation functions and half-lives were measured. The experimental results are interpreted with the unified model. Recently found rotational bands are also excited in these reactions.     

Level properties of the light even Sb nuclei 112, 114, 116Sb

The level properties of ^{112, 114, 116}Sb have been investigated with the reactions ^112,114,116Sn(p, nγ)^112,114,116Sb and ¹¹⁵In(³He, xnγ)^112,114Sb (x = 6, 4). Singles γ and electron spectra, neutron-γ coincidences, γ-γ coincidences, excitation functions and half-lives were measured. Hauser-Feshbach calculations were performed for spin assignments. A number of new levels were found, including two 8^? isomeric states. The results are compared with recently performed 2qp calculations.     

Two-particle rapidity correlations in αα, αp,andp p interactions at the CERN intersecting storage rings

Two-particle rapidity correlations have been studied for αα, αp, andp p interactions at the CERN ISR using the Split-Field Magnet (SFM) detector. In order to isolate the true two-particle correlations, the analysis was performed at fixed charged multiplicity. In the framework of a simple cluster model, it is found that cluster widths as well as cluster multiplicities are the same for αα, αp, andp p interactions, and both decrease with increasing charged multiplicity.