A hodoscope calorimeter for high enegy hadrons: ihep-iisn-lapp collaboration.

A total absorption hodoscope calorimeter is described. It allows the simultaneous measurement of the energy of the incident hadrons as well as their coordinates with a precision of 1 cm for hadron energies of tens of GeV and higher. The behavior of the calorimeter is studied with incident pions, kaons, antiprotons and electrons.SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

G(1590), a scalar meson decaying into two eta-mesons

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Observation of a spin-6 neutral meson r(2510)

In a high-statistics experiment (200 events/nanobarn) performed at the 70 GeV IHEP accelerator, a new dipion resonance has been observed in π-p collisions at 38 GeV/c momentum. The gamma-rays in reaction π-p → M0n, M0 → π0π0 → 4γ have been detected in the hodoscope spectrometer GAMS-2000. The new meson, r(2510), has a mass (2510±30) MeV/c2, a width (240±60) MeV/c2 and spin-parity J PC=6++. The production cross-section of the f, h and r mesons decreases exponentially with spin like exp [-0.9 J]. © 1984 Società Italiana di Fisica.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Small-momentum-transfer K-p charge exchange scattering at 30 GeV/c

The {Mathematical expression} charge exchange differential cross-section has been measured at 30 GeV/c with high statistical accuracy and high angular resolution. The experiment was made at the IHEP 70 GeV accelerator, by using a hodoscope hadron calorimeter to detect K L 0 .The cross-section shows a dip at smallSCOPUS: ar.jinfo:eu-repo/semantics/publishe

Study of π-p→η′ηn in a search for glueballs

η′η pair production in the charge exchange reaction π-p→η′ηn has been observed and studied in a search for glueballs with the 38 GeV/c pion beam of the 70 GeV IHEP accelerator. The γ-rays from the decay η′η→4γ were detected with the hodoscope spectrometer GAMS-2000. The η′η events in the mass range from threshold up to 1.8 GeV are decays of the scalar G(1590)-meson which has been already observed in its ηη decay mode. The measured ratio of the partial widths of the G→η′η and the G → ηη decay channels is 2.7±0.8 in agreement with the value expected for glueballs. © 1984 Società Italiana di Fisica.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

χ particle production in π-p collisions at 38 GeV/c

The production of χ particles in the reaction π-p → χ + .has been studied near threshold. The measurements have been performed at the 70 GeV IHEP proton synchrotron using the hodoscope spectrometer GAMS-2000. The χ particles have been identified through their decay χ → J/ψ + γ, J/ψ → e+e-. In the region XF ≳0.4 the fraction of obsered J/ψ particles which is obtained via the decay of χ states is 0.44 ± 0.16. The χ longitudinal and transverse momentum distributions are similar to those obtained for J/ψ. The inclusive production cross section of χ particles (3P1 and 3P2 states) at 38 GeV/c is σXF>0 (π-p → χ + .) = (28±11) nb. © 1984.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Hodoscope gamma spectrometer gams-200

A 208 channel hodoscope γ spectrometer, the cells of which are made of lead-glass, is described. This detector makes it possible to measure simultaneously the coordinates (with an accuracy of 1.5 mm), and energy (to a few percent) of a large number of gammas and to reconstruct the mass and momentum of the particles decaying into gammas. The characteristics of the spectrometer have been studied in an electron beam and also under the conditions of real experiments (π0 → 2γ). © 1981.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The isospin-violating decay η' → 3π0

In an experiment performed at the 70 GeV IHEP accelerator the rate decay η'(958) → 3π0, which violates isosoin conservation, has been observed. The six final decay gamma rays are detected in the hodoscope spectrometer GAMS-2000. The branching ratio of this decay is BR (η' → 3π0) = (1.6 ± 0.4) × 10-3. An estimate of the ratio of the masses of u and d quarks is given. © 1984.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Small

π-p→π0n differential cross-sections have been measured in the region of small 4-momentum transfer at 40 GeV/c incident momentum. The experiment performed at the IHEP 70 GeV accelerator makes use of a hodoscope γ-spectrometer. The t- dependence of the cross-section points to a dominance of the spin-flip amplitude. © 1981 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Observation of the decay η → π0γγ

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