H. Schopper

Measurement of inclusive neutron spectra at the ISR

With a total absorption counter, inclusive neutron spectra have been measured at four ISR energies and at angles of 20, 66 and 119 mrad. The spectra show scaling behavior in the variables x and p⊥. Pion exchange is found to be important at large x values.

A total absorption spectrometer for energy measurements of high-energy particles

Abstract A sampling total absorption counter (STAC) is described, which consists of a sandwich of iron and scintillator plates. It permits the energy determination of neutrons or other strongly interacting particles with energies above 3 GeV. The optimization of the energy resolution and other properties of the counter are reported. At 24 GeV/ c an energy resolution of ± 11% was achieved.

Measurement of neutron-proton charge exchange scattering at 8, 19 and 24 GeV/c

Abstract The t -dependence of the differential cross-section for elastic neutron-proton charge exchange scattering has been measured at 8, 19.2 and 24 GeV/ c . The extremely narrow peak in the forward direction, previously observed for momenta up to 8 GeV/ c , presists at the higher momenta, and the t -dependence shows practically no change with energy. Approximate values of the absolute cross-section were also determined for these momenta.

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.

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.

Neutron-nucleus total cross-sections between 8 GeV/c and 21 GeV/c 1

Abstract Total cross-sections for neutrons on Be, C, Al, Cu and Pb have been measured to an accuracy of about 1% at average neutron momenta of 8, 11, 14 and 21 GeV/ c . For all elements they drop smoothly 1 by about 3% between 8 and 21 GeV/ c , and have a momentum dependence similar to the pp and np total 1 cross-sections. Indeed if the cross-sections are normalized to the np total cross-section, no momentum dependence can be observed. The data are compared with calculations based on the Glauber model.

Neutron-proton total cross-sections between 8 GeVc and 21 GeVc☆

Abstract Neutron-proton total cross-sections were measured in the momentum range from 8 GeV/ c to 21 GeV/ c with an accuracy of better than 2% using a 0 o neutron beam at the CERN Proton Synchrotron. The np total cross-section drops from 39.7 mb at 8 GeV/ c at 21 GeV/ c , and thus follows closely the pp total cross-sections in this momentum interval.

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.

Neutron-proton charge exchange scattering from 9 to 23 GeV/c

Abstract The differential cross sections for neutron-proton charge-exchange scattering have been measured with high statistics in the region of momentum transfer squared 0.002 t | ⩽ 0.400 (GeV/ c ) 2 and for incident neutron momenta 9 p ⩽ 23 GeV/ c .