Phys. Lett. B

The results of an experimental search for new long-lived particles performed at Serpukhov discussed in terms of the possible existence of superdense nuclei. The upper limits of cross sections for the production of radiactive superdense nuclei in collisions of high energy protons with normal nuclei are presented.

Nuovo Cim.A

Measurements of the differential cross-sections of the (π−,3He) scattering at 68 MeV, of the (π+,4He) scattering at 120 MeV and of the (π−,4He) scattering at 174 MeV are presented. The experiment has been carried out by means of a high-pressure self-shunted streamer chamber filled with helium and triggered by a hodoscope of scintillation counters. The elastic differential cross-sections have been measured and the results are compared with the optical-model calculations. A new estimate of thef2(π3He3H) coupling constant is also presented.

Lett.Nuovo Cim.

Nucl.Phys.A

The high-energy parts of the spectra of 3 H, 3 He and 4 He nuclei obtained in bombarding Li, Be and C targets with 665 MeV protons as well as the spectra of fast deuterons as a function of the proton energy (from 380 to 665 MeV) at a lab angle of 5.5° have been measured. The mechanisms of the interactions of intermediate-energy protons with light nuclei are discussed. It is found that the production of fast nuclear fragments at a small angle can be explained to a large extent by direct nuclear reactions of two types, i.e. quasielastic scattering and pion production processes on clusters.

Nucl.Phys.A

Elastic and inelastic scattering of 1.044 GeV protons have been studied on isotopically enriched even 40, 42, 44, 48 Ca isotopes and 48 Ti. A spin independent Glauber theory analysis of the elastic scattering allowed the extraction of neutron and nuclear matter densities for these targets.

AIP Conf.Proc.

The spin correlation parameter Cnnhas been measured in elastic pp scattering at 610 MeV at CM angles of 40, 67, 78, 90°. A polarized protonbeam (PmaxB=0.38±0.02) and a ’’frozen’’ polarize proton target (PmaxT=0.97±0.04) have been used in the experiment.

Lett. Nuovo Cim.

Nucl.Phys.A

An enhancement with a width of about 50 MeV is observed near the sum of the Δ(1236) and nucleon masses in the effective mass distribution of the two-proton system in the deuteron break-up reaction. The possible mechanisms leading to the production of the peak are discussed.

Nucl.Phys.A

The results of the irradiation of natural mercury, gold and platinum targets with stopped negative pions are reported. The product nuclei distributions indicate that the ( π − , x n) reaction dominates over reactions with charged particle emission. The neutron multiplicity after pion capture can be as large as x = 16. Furthermore, the preferential population of high-spin isomeric states is observed. The extracted isomeric ratios are compared with those from other reactions.

AIP Conf. Proc.

Cross‐sections for the double charge exchange of positive pions on 4He at various energies are presented. For measurements a high‐pressure helium streamer chamber has been used. The experimental results are compared with theoretical model calculations based on pair correlations or meson exchange currents.

Lett.Nuovo Cim.