Calibration of a large multi-element neutron counter in the energy range 8.5-430 MeV
Nuclear Instruments and Methods 156:3 (1978) 411-423
Abstract:
We describe the calibration of a large 60 element neutron counter with a threshold of 2.7 MeV equivalent electron energy. The performance of the counter has been measured in the neutron kinetic energy range 8.5-430 MeV using a neutron beam at the CERN Synchrocyclotron. The results obtained for the efficiency as a function of energy are in reasonable agreement with a Monte Carlo calculation. © 1978.Production of A2 0 and ω* (1675) in the reaction π-p → π+π-π0n at 12 and 15 GeV/c
Nuclear Physics, Section B 138:2 (1978) 235-252
Abstract:
Data on the reaction π-p → π+π-π0 have been taken at 12 and 15 GeV/c with the CERN Omega multiparticle spectrometer. In a 3-pion partial-wave analysis strong production of A20 (1310) and ω* (1675) is observed. Total and differential cross sections are determined and density matrix elements presented as a function of t in the t- and s-channel frames. The energy dependence of A20 production is studied, and a comparison of ω(780), A20(1310) and ω* (1675) production is made. © 1978.New data on the π+ π- angular distribution in the mass range 0.8 - 2.2 GeV/c2
Nuclear Physics, Section B 137:3 (1978) 221-252
Abstract:
An experiment has been performed on the Omega spectrometer to study the channel π-p → π+π-n at 12 and 15 GeV/. The π+π- angular distribution has been studied in the π+π- invariant-mass region 0.8-2.2 GeV/c2, for events with four-momentum transfer squared from proton to neutron in the range -0.02 to -0.15 (GeV/c)2. The spherical harmonic moments of the angular distribution are presented. Up to a mass of 1.7 GeV/c2 the moments agree with previous experiments. At higher masses Y70, Y80 and Y90 are non-zero and indicate the presence of ππ amplitudes with spin greater than 3. © 1978.A partial-wave analysis of the neutral 3π system produced in the reaction π-p → (π+π-π0) n at 12 and 15 GeV/c
Nuclear Physics, Section B 136:1 (1978) 77-94
Abstract:
Data on the charge-exchange reaction π-p → (π+π-π0)n have been taken at beam momenta of 12 and 15 GeV/c, using the CERN Omega Multiparticle Spectrometer. A partial-wave analysis has been made of the (3π)0 system. We observe both natural and unnatural spin-parity production. The natural parity states can be identified with established resonances. In addition a natural spin-parity enhancement is observed at a mass of about 2 GeV/c2 with JP = 4+ preferred. We have called this effect the A2* (2030). The unnatural spin-parity production found is consistent with reggeized Deck model predictions. No unambiguous A1 or A3 production is observed. © 1978.Observation of the D, E and δ mesons in π-p interactions at 12 and 15 GeV/c
Nuclear Physics, Section B 144:2-3 (1978) 253-268