Cross sections of the interactions of He nuclei with protons

⁴He-p collisions at two values of⁴He momenta 8.6 GeV/c and 13.6 GeV/c as well as the³He-p collisions at 13.5 GeV/c have been studies using the one-meter JINR hydrogen bubble chamber. Total, elastic, topological and reaction cross sections have been measured. The cross sections have been determined on a sample of minimum biased events.     

α-particle break-up in the interaction with protons at 8.6 GeV/c 4He momentum

Helium break-up reactions have been studied in ⁴He-proton interactions at 8.6 GeV/c⁴He momentum in the hydrogen bubble chamber. Total and differential cross sections for different reaction channels without pion production have been measured. The results have been compared with multiple scattering model predictions.     

Cross sections for exclusive channels in\bar pp reactions at 12 GeV/c

The data obtained in an exposure of BEBC to an r.f. separated beam of antiprotons at 12 GeV/c are used to derive exclusive cross sections for reactions having one or more neutral strange particles in the final state. Particular attention is given to the estimation of the background. An upper limit of the cross section for the inclusive production of the charmed mesonD ^* is also given.     

Cross sections and multiplicity distributions forK + p interactions at 70 GeV/c

Cross sections and charged multiplicity distributions forK ⁺ p interactions at 70 GeV/c are presented and compared withK ⁺ p data at other energies. Comparisons are also made with available π⁺ p,pp, andK ^? p data.     

Elastic scattering of antiprotons on protons at 5 GeV/c evidence for a backward peak

Antiproton-proton elastic scattering has been measured at 5 GeV/c. A total of 30 000 events were observed in the angular range 17° < θ_cm < 136°, corresponding to 0.3 < −t < 7.7 (GeV/c²). In addition to the known dip at −t = 0.5 (GeV/c)², we observe a structure at about −t = 2 (GeV/c)² and a backward peak with a slope4.1 ± 0.6 (GeV/c)². The extrapolated differential cross-section at u = 0 is 1.3 ± 0.8 μb/(GeV/c)².     

Direct photon production from pions and protons at 200 GeV/c

Direct photon production has been studied by an experiment performed with the NA3 spectrometer at CERN, using incident negative and positive beams at 200 GeV/c interacting with an isoscalar Carbon target. Two different triggers have been used; one of them requires the photon conversion. The experiment is sensitive to direct photons produced with 3.0≦P _T ≦6 GeV/c and center-of-mass rapidity ?0.4≦y ^*≦1.2. Inclusive cross sections are given for incident π^± and protons, and compared with second order QCD predictions; finally an estimation of the gluon structure function of the nucleon is given.     

Cross sections and charged multiplicity distributions for π−p and K−p interactions at 147 GeV/c

The results presented in this paper were obtained from a 105 000 frame exposure of the FNAL Hybrid Proportional Wire Chamber-30 inch Bubble Chamber System, in a tagged beam of 147 GeV/c negative particles. Elastic, total and topological cross sections were obtained for both π^?p and K^?p interactions. Comparisons with other data, taken with various beam particles over large momentum intervals, show good agreement with KNO scaling, and similarity in the scaling behavior of σ_n for the different beam particles.     

Cross sections of Au at 10 A GeV and of Pb at 158 A GeV

We have measured total and elemental charge changing cross sections fro the fragmentation of 10 AGeV ¹⁹⁷Au- and 158 AgeV ²⁰⁷Pb-beams interacting with different targets (C, CH₂, Al, Cu, Ag, and Pb) using stacks of CR-39 and of BP-1 nuclear track detectors. Electromagnetic dissociation (ED) significantly contributes to these interactions besides nuclear fragmentation. Based on the factorization of elemental cross sections it is possible to separate electromagnetic dissociation cross sections from the measured data. The analysis of the Au 10 AGeV experiment is completed. For the Pb-beam the analysis is in progress. First results will be reported.     

Channeling of 1.1 GeV/c protons and pions

Channeling effects have been observed for 1.1 GeV/c protons and pions transmitted through a 1 mm thick germanium single crystal.     

Cross sections for the production of Li and Be isotopes in carbon targets irradiated by 300 GeV protons

Cross sections for the production of Li and Be isotopes in carbon targets irradiated by 300 GeV protons have been measured by mass spectrometry. The results are compared with lower energy measurements and discussed in terms of the variation of the cosmic ray L/M ratio in this energy region.     

Recent study for multibaryon states with strangeness in pC interaction at 10 GeV/c

Strange multibaryon states with Λ-hyperon and K _s ⁰ -meson subsystems has been studied from 700 000 stereo photographs or 10⁶ inelastic interactions which was obtained from expose of 2-m propane bubble chamber (PBC) LHEP, JINR to proton beams at 10 GeV/c. The obtained results from PBC can be divided into three subjects: in-medium effects of hadronic particles; baryon spectroscopy; hyper-nucleus production. At present the experimental situation is confused; so is theory. New accelerator research complexes has unique possibility for high-statistic and 4π-geometry study of exotic states.     

Breakup of 4He with polarized protons at 65 MeV

For the ⁴He(p, p³H)¹H reaction, large negative analyzing powers are observed in the FSI regions. For the inelastic scattering of protons, the angular dependence of the analyzing power is well reproduced by the single and double scattering terms of the Faddeev breakup theory.     

αα elastic scattering at 4.32 GeV/c and 5.07 GeV/c

αα elastic scattering was measured at 4.32 GeV/c and 5.07 GeV/c incident momenta. The four-momentum transfer range, extending from ?0.05 to ?0.77 (GeV/c)², covers the first and second minimum regions. The results are compared with calculations based on Glauber theory.     

Topological cross sections and charged particle multiplicities inpp interactions at 360 GeV/c

Using data obtained with EHS equipped with the Rapid Cycling Bubble Chamber (RCBC) exposed to a proton beam of 360 GeV/c, we calculate topological cross sections. We present in great detail the procedure and the techniques used to correct raw data. Finally, we give multiplicity moments and multiplicity correlations and we compare the values obtained in our experiment, together with data at other energies, with different models.     

Spallation of copper by 9 GeV/c protons and deuterons

The spallation of copper by 9 GeV/c protons and deuterons has been studied. Cross sections for the production of radionuclides with 24 A 60 were determined from direct gamma-ray counting of irradiated targets with a Ge(Li) — spectrometer. The results were parametrized in terms of a 6-parameter formula which reproduces the measured charge-dispersion and mass-yield distributions. The proton results are compared with previous investigations.We wish to acknowledge with thanks the cooperation of Yu. A. Panebratsev, A. N. Khrenov, V. G. Perevozchikov and the members of the Dubna synchrophasotron staff. Without their assistance the present work would not have been possible.     

Cross sections of annihilation and inelastic final states for pp interactions at 9.1 GeV/c

Topological and channel cross sections are given for annihilation and inelastic final states produced in $\text{p}\text{p}$ interactions at 9.1 GeV/c. Cross sections for prominent resonances in specific channels and charged pion, ?⁰ and Δ⁺⁺ inclusive cross sections are also presented.     

Inclusive highP T π0 production from π± and protons at 200 GeV/c

We have measured the inclusive cross-section for π⁰ production at large transverse momentum by 200 GeV/c positive and negative hadron beams on Carbon targets (2.9<P _T <6 GeV/c; ?0.4<y ^*<1.2). We used the NA3 spectrometer at the CERNSPS.     

Double prompt photon production at high transverse momentum byπ − on protons at 280 GeV/c

A search for pairs of highp _T prompt photons produced in hydrogen by a 280 GeV/c incidentπ ^- beam has been carried out using a fine-grained electromagnetic calorimeter and the Omega spectrometer at the CERN SPS. Clear evidence for the existence of such events is found with a six standard deviation signal forp _T >3.0 GeV/c. The cross-sections are consistent with beyond leading order QCD calculations. A discussion on the determination of α _s is also presented.     

Acceleration of polarized protons to multi-GeV energies and experiments with polarized protons from 2–6 GeV/c

Acceleration of polarized protons. Experiments with polarized protons. Proton-proton total cross-section. Two and three spin proton elastic scattering measurements. Polarization measurements in nucleon-nucleon elastic scattering. Inelastic interactions. Inclusive lambda production. Coherent polarized proton⁴He interactions. Parity tests.Presented at the Symposium on Hadron-Hadron Scattering at High Energies, Liblice, Czechoslovakia, June 16–21, 1975. Work supported by the U.S. Energy Research and Development Administration.I would like to thank the authors of all the experiments I have mentioned for their information, both published and unpublished.