Yu. P. Merekov

Large-angle quasi-free scattering in 6Li(p, pd)4He at 670 MeV

Abstract The 6 Li(p, pd) 4 He reaction was investigated at 670 MeV by a coincidence experiment with a large-angle scattering geometry. The energy sharing and angular correlation of the reaction products were measured and the momentum distribution of the recoil nucleus was determined for transitions leading to residual nuclei in the ground and excited states. Results were analysed in terms of a simplified distorted-wave impulse approximation using cluster-model and three-body wave functions. The observed momentum distribution of the p-n pair in the p-shell of 6 Li is in agreement with three-body calculations, while the spectroscopic factor is larger than predicted by theory. Transitions to breakup states of the α-particle also have the characteristics of quasi-free scattering on deuteron clusters.

Study of the spectra of fast deuterons produced in the interaction of 670 MeV protons with nuclei

Abstract The spectra of deuterons emitted at angles of 6.5°, 9.5°, 13.5° and 16° (lab system) in the interaction of protons with the nuclei 1 H, 2 H, 6 Li, 7 Li, C, Al, Cu, Rh and Pb have been measured in the momentum range 700–1700 MeV/ c . The secondary particles were analyzed with the help of magnetic and time-of-flight spectrometers. The differential cross sections for deuteron production in the reactions p + 〈2N〉 → N + d and p + 〈N〉 → d + π have been measured for selected nuclei and angles. The effective numbers of nucleons and of two-nucleon clusters for the investigated nuclei were determined. The results obtained are discussed in terms of the dispersion theory of direct nuclear reactions.

On the 1350 MeV Λγ peak produced in π− p interaction

Abstract The existence of the Λγ peak between 1300 and 1400 MeV was supported by our measurements. The explanation of this peak by means of the hypothetical Λη (1680 MeV) resonance can be rejected with a 97% confidence level.

Quasi-free scattering in 7(p, pd)5He and 12C(p, pd)10B reactions at 670 MeV

Abstract The reactions 7 Li(p, pd) 5 He and 12 C(p, pd) 10 were investigated at 670 MeV in quasi-free scattering geometry at large angles. In transitions to low-lying as well as to highly excited states of the residual nuclei the energy distributions of the scattered protons are in agreement with the mechanism of quasi-free scattering on quasi-deuterons in the p- and s-shells of 7 Li and 12 C.

Charged particle multiplicities in π−1,K− and\(\bar p\) interactions with nuclei at 40 GeV/c

AbstractInteractions of 40 GeV/c πp-,K− and

Neutral strange particle production in high transverse momentum π− nucleus interactions at ∼40 GeV/c

\bar p

Results of mass testing of mini drift tubes for the D0 forward muon system

on Li, C, S, Cu, CsI and Pb were studied with the RISK-streamer chamber spectrometer. We present multiplicities of negatively charged particles, as well as of protons, and the correlations between them. The normalized mean multiplicity of negative particles,R−, depends on