Bruce Cork

The properties of proton-proton interactions between 100 and 1000 GeV from a cosmic-ray experiment

Abstract Proton-proton interactions above 100 GeV have been studied in an experiment using cosmic-ray protons interacting in a liquid hydrogen target. From several hundred hydrogen interactions, it has been learned that: (a) the total inelastic pp cross section is not changing significantly with energy above 30 GeV; (b) the multiplicity distributions of charged prongs agree with a Poisson distribution in charged-particle pairs; (c) the average charged prong multiplicity increases as 1 n s ; (d) the angular distribution of charged particles agrees with a c.m. momentum distribution of charged particles that varies as exp exp [−8 p T 2 −8 x 2 ] d 3 p / E (where x = p L / p o ) and a nucleon distribution that varies as 10 x exp [−3 p T 2 ] d 3 p / E for 0.05

A calorimeter for 300 GeV neutrons and protons

Abstract A total-absorption calorimeter for determining the energies of hadrons has been built and tested in beams at the National Accelerator Laboratory. The calorimeter is being used in an experiment to measure neutron total cross sections. The design of the calorimeter is described and its performance is reported. The resolution of the calorimeter for 300 GeV protons is found to be 12.8% fwhm.

Neutron-nucleus total cross sections at 5.7 GeV/c☆

Abstract The neutron total cross sections for He, Be, C, Al, Fe, Cu, Cd, W, Pb and U have been measured to an accuracy of 2% at 5.7 ± 0.6 GeV/c. The total cross section versus atomic weight data was fit to an absorbing uniform grey sphere optical model. The best fit parameters are R = a o A 1 3 where ao = 1.27 ± 0.01 fm, and a nucleon mean free path in nuclear matter of 3.0 ± 0.2 fm. The energy dependence of the nucleon-nucleus total cross sections is discussed in terms of the nucleon-nucleon total cross sections and a screening terms.

Neutron-proton and neutron-deuteron total cross sections at 4.0 and 5.7 GeV/c

Abstract The np and nd total cross sections have been measured directly with a neutron beam with momenta of 4.0 ± 0.6 and 5.7 ± 0.6 GeV/ c . The data are compared with the previous nucleon-nucleon and nucleon-deuteron results, and the deuteron screening term was also evaluated. The measured total cross section are 43.1 ± 0.6 and 80.3 ± 1.9 mb at 4.0 GeV/ c and 42 ± 0.6 and 77.8 ± 1.3 mb at 5.7 GeV/ c .

Measurement of the inclusive K/sub S//sup 0/ branching fraction in tau decay

A data sample corresponding to an integrated luminosity of 300 pb/sup -1/ of e/sup +/e/sup -/ annihilations at 29 GeV was used to measure the inclusive branching fraction tau/sup -/ ..-->.. K/sub S//sup 0/X/sup -/nu/sub tau/. The experiment was performed using the High Resolution Spectrometer at the PEP storage ring. The measured branching fraction is (0.64 +- 0.15)%. The data are consistent with all K/sub S//sup 0/ coming from the Cabibbo-suppressed decay tau ..-->.. K*/sup -/(890)nu/sub tau/ leading to a branching ratio of (1.9 +- 0.28 +- 0.25)% for this channel. The inclusive sample was used to set 90% CL limits on the branching fractions of tau/sup -/ ..-->.. rho/sup -/(1600)nu/sub tau/ and tau/sup -/ ..-->.. K*/sup -/(1430)nu/sub tau/ of 8.5%, and 0.3% respectively. 18 refs., 3 figs.

A calorimeter for 300GeV neutrons and protons

Abstract A total-absorption calorimeter for determining the energies of hadrons has been built and tested in beams at the National Accelerator Laboratory. The calorimeter is being used in an experiment to measure neutron total cross sections. The design of the calorimeter is described and its performance is reported. The resolution of the calorimeter for 300 GeV protons is found to be 12.8% fwhm.

A CALORIMETER FOR 300-GeV NEUTRONS AND PROTONS

Abstract A total-absorption calorimeter for determining the energies of hadrons has been built and tested in beams at the National Accelerator Laboratory. The calorimeter is being used in an experiment to measure neutron total cross sections. The design of the calorimeter is described and its performance is reported. The resolution of the calorimeter for 300 GeV protons is found to be 12.8% fwhm.

Neutron-proton diffraction scattering and neutron total cross-secions up to 200-GeV

The authors propose to use the 0{sup o} neutral beam planned for Experimental Area 2 to measure differential cross sections for np elastic scattering in the diffraction region over the energy range of from 40 to 200 GeV and also total cross sections for neutrons on protons, deuterons, and other nuclei over the same energy range. The proposed experiments would use techniques previously developed by the authors in similar experiments at the Bevatron and the AGS. Most of the apparatus already exists. The two experiments could be run in the same beam, either simultaneously or sequentially. The experiments are simple and place very modest demands on accelerator performance.