123656934
Cumulative production of three-nucleon nuclei in 16Op collisions at a momentum of 3.25 GeV/c per nucleon
The production of cumulative three-nucleon nuclei (3H and 3He) in 16Op collisions at a momentum of 3.25 GeV/c per nucleon were studied for the first time under conditions of 4π geometry. The slope parameter of the cross section for the production of cumulative three-nucleon nuclei was determined, and new data on correlations of the yields of A = 3 cumulative nuclei, charged particles, and fragments in 16Op interactions are reported. The properties of cumulative and noncumulative events were found to be substantially different, and evidence for the presence of a common universal feature in the mechanisms for the cumulative production of hadrons and light nuclear fragments was obtained.
123557824
Production of baryon resonances in + C interactions at 40 GeV/c
In conditions of 4{pi}-geometry, the production of {delta}{sup ++} and {delta}{sup 0} resonances in {pi}{sup -}+ {sup 12}C interactions at 40 GeV/c was investigated for the first time. The masses and widths of resonances were obtained from an analysis of the experimental and background invariant mass distributions of p{pi}{sup {+-}} pairs. The fractions of charged pions coming from {delta}{sup ++} and {delta}{sup 0} decay as well as the inclusive cross-section of {delta}{sup ++} and {delta}{sup 0} production were determined. The results obtained were compared to the recent results on {delta}(1232) production in {sup 4}He +C and C+C collisions at 4.2 GeV/c per nucleon, and Ni+Ni and Au+Au collisions at energies between 1 and 2A GeV.
119339551
Fragmentation of relativistic oxygen nuclei in interactions with a proton
Abstract.The data on investigation of inelastic interactions of 16O nuclei in a hydrogen bubble chamber at an incident momentum of 3.25 A GeV/c are presented. Separate characteristics as fragments isotope composition and topological cross-sections of fragmentation channels are given. The processes of formation of light fragments and unstable nuclei, and the break-up of the 16O nucleus into multicharge fragments are investigated. A comparison between the experimental data and the calculations of the cascade fragmentation evaporation model (CFEM) is made. The observed singularities of the interactions point out the important role of the nucleus α-cluster structure in the formation of the final products.
195343399
Experimental investigation of charge-exchange processes involving a target proton in 16Op collisions at a momentum of 3.25 GeV/c per nucleon
For the first time, charge-exchange processes involving a target proton in 16Op collisions at a momentum of 3.25 GeV/c per nucleon are studied under conditions of 4π geometry. New data on the mean multiplicities fragments and pions, as well as on inelastic cross sections for topological channels of the fragmentation of an oxygen nucleus in charge-exchange reactions involving a target proton that either are accompanied or are not accompanied by charge transfer to a projectile nucleus, are presented. It is shown that, in 16Op interactions at high energies, charge transfer from a target proton to a projectile nucleus proceeds predominantly via inelastic proton scattering on a neutron of the oxygen nucleus.
119859530
Production of multibaryon clusters in hadron-nucleus collisions at high energies
The results obtained by analyzing the production of multibaryon clusters in π−C and p20Ne interactions at momenta of 40 and 300 GeV/c, respectively, are presented.
120774373
Production of cumulative deuterons in collisions of oxygen nuclei with protons at a momentum of 3.25 GeV/c per nucleon
The production of cumulative nuclei of 2H in 16Op collisions at a momentum of 3.25 GeV/c per nucleon was studied for the first time under conditions of a 4π acceptance. The parameter T0 characterizing the slope of the spectrum of invariant cross sections for cumulative-deuteron production in 16Op interactions was determined. The contribution to cumulative-deuteron production from the decay of the alpha-particle clusters in nuclei upon slow-pion absorption by these clusters was found on the basis of an analysis of the momentum distribution of these cumulative nuclei. The estimates obtained for the contribution of these processes from a comparison of the mean multiplicities of particles and fragments in cumulative and noncumulative events agree well with the respective result extracted from the momentum distribution of cumulative deuterons.
122883220
Cross sections for the production of stable and unstable isotopes with charge numbers from one to eight in 16Op collisions at 3.25 A GeV/c
New experimental data are presented for the inclusive cross sections both for the production and for the yield of stable and unstable isotopes with charge numbers from one to eight in 16Op collisions at 3.25 A GeV/c.
103063465
Resonance Production in pi- p Interactions at 40-GeV/c
121855103
Phenomenological analysis of the channels of the production of three and four alpha particles in 16Op collisions at 3.25 GeV/c per nucleon
A phenomenological analysis of the channels of the production of three and four alpha particles in 16Op collisions at 3.25 GeV/c per nucleon is performed for the first time under conditions of 4π geometry. The experimentally observed azimuthal asymmetries and collinearity are described on the basis of a phenomenological model that assumes that the excitation of the nucleus involved is peripheral and that its decay is statistical. It is shown that the azimuthal asymmetries in question are due to the transverse motion of the fragmenting nucleus. The mean transverse momentum of alpha particles and the collinearity of their emission in the reaction plane are found to be independent of the transverse-momentum transfer to the nucleus involved.
120218483
Fragmentation of relativistic oxygen nuclei on protons
123908797
Inclusive deuteron production in 16Op collisions at a momentum of 3.25 GeV/c per nucleon
Experimental data on inclusive deuteron production in 16Op collisions at high energies were obtained for the first time under conditions of 4π geometry. An irregularity in the momentum spectrum of deuterons in the rest frame of oxygen nuclei is found in the range 0.40 ≤ p ≤ 0.55 GeV/c, and the reasons for its appearance are discussed. The mean multiplicities of secondary fragments are correlated with the presence of deuterons in an event, these correlations being positive for fragments of charge in the range zf ≤ 4 and negative for fragments of charge in the range 5 ≤ zf ≤ 7. This is likely to be due to baryon-charge conservation.