E. M. Leikin

The performance of a total absorption spectrometer up to energies of 60 GeV

Abstract The response of a sampling total absorption counter (STAC) to protons, neutrons, pions, and electrons with incident energies up to 60 GeV is described. A good linearity was observed, and for protons a resolution of ±6% at 60 GeV/ c could be achieved. The absolute fwhm rises slowly with energy from 4.5 GeV/ c at 10 GeV/ c to 7.2 GeV/ c at 60 GeV/ c . The fraction of the energy deposited in the scintillator by incident π + and e + is on the average 9% and 50% higher than that deposited by protons.

Neutron-proton elastic scattering from 10 to 70 GeV/c

Abstract The neutron-proton elastic differential cross section has been measured for incident momenta between 10 and 70 GeV/c and for values of the momentum transfer squared between 0.1 and 2.8 (GeV/c) 2 . The forward peak and the break at about ∣ t ∣ = 1 (GeV/ c ) 2 are very similar to corresponding pp data.

Inclusive ϱ0 production in pp interactions at 22.4 GeV/c

Abstract Inclusive ϱ 0 production has been investigated in p p reactions at 22.4 GeV/ c . The total cross section for ϱ 0 production is 8.1 ± 2.0 mb. The average ϱ 0 s per event is 0.17 ± 0.03. The average transverse momentum, as obtained by extrapolation of a fitted simple exponential to the p T 2 distribution, is 0.52 ± 0.12 GeV/ c . The Feynman x and c.m. rapidity distributions show ϱ 0 to be “centrally” produced.

Neutron-proton charge-exchange scattering from 22 to 65 GeV/c

Abstract The differential cross sections for neutron-proton elastic charge-exchange scattering have been measured with a two-arm technique for incident neutron momenta between 22 and 65 GeV/ c and for values of the momentum transfer squared between 0.002 and 0.8 (GeV/ c ) 2 . The sharp forward peak observed previously at lower energies is also present at momenta up to 65 GeV/ c ; however the s dependence of the cross section is slowing down.

Experimental verification of the dual unitarization scheme

Abstract The connection between particle production in antiproton-proton annihilation and non-diffractive proton-proton processes is discussed in the framework of the dual unitarization scheme. We calculate relative multiplicity moments for antiproton-proton annihilation using the moments of non-diffractive proton-proton interactions and find good agreement with experimental annihilation data.

Diffraction dissociation of neutrons into (pπ−) on protons in the momentum range 35 to 65 GeV/c☆

The diffraction dissociation reaction n + p → (pπ−) + p was studied at the Serpukhov accelerator neutron beam in the momentum range 35–65 GeV/c in an electronics experiment. The differential cross sections of the reaction are analysed and presented in the five-dimensional phase space (pn, m∗, t, cosθ∗, φ∗). The backward peak observed in the distribution over if cosθin GJ ∗ in the Gottfried-Jackson frame of if(pπ) is interpreted as a baryon-exchange effect. The angular distribution of the (pπ−) system is compared with Deck-type models.

The neutron total cross section measurements on protons and nuclei in the energy range of 28–54 GEV

Abstract The results of the total cross section measurements of neutrons on protons, deuterons and nuclei C, O, Al, Cu, Sn, Pb in the energy range of 28–54 GeV are reported.

Observation of the dependence of the interference effect of identical pions on pion pair velocity in inclusive ¯pp-interactions at 22·4 GeV/c

The Bose-Einstein interference effect is studied using 7333 events of ¯pp-interactions withnch≧6 at 22·4 GeV/c. An essential dependence of the strength of this effect on the pion pair velocity is observed. An indication is obtained that processes with essentially different time characteristics (τ<1 fm and τ>2 fm) contribute to ¯pp-interactions at 22·4 GeV/c. The interpretation based on abundant resonance production in high energy collisions is discussed.

Inclusive production of Δ++ (1236) in pp interactions at 22.4 GeV/c

Abstract The inclusive and semi-inclusive production of Δ ++ (1236) is investigated in p p interactions at 22.4 GeV/ c . The Δ ++ cross section is 1.78 ± 0.18 mb in the region of | t p Δ | ⩽ 0.74 (GeV/ c ) 2 . The differential cross section has been studied as a function of transverse and longitudinal variables. Evidence for the one-pion exchange contribution to the Δ ++ inclusive process has been obtained from the decay angular distributions of the Δ ++ .

Inelastic\(\bar p\)p interactions at 22.4 GeV/c compared withe+e− annihilation into hadrons

AbstractThe 22.4 GeV/c