Phys. Lett. B

The inclusive cross sections of protons emitted with energies from 60 to 145 MeV in the bombardment of 12 C by 640 MeV protons have been measured for seven laboratory angles from 105° to 160°. Under the same conditions proton spectra have been studied at 140° by using Be, Al, Cu and Pb targets. The behaviour of the structure function Eσ t −1 ·d σ /d 3 P at intermediate energies is discussed.

Phys.Rev.C

We have studied He4-p collisions at a He4 incident momentum of 8.56 GeV/c using the 1 m Dubna bubble chamber. The p— He4 elastic scattering, the coherent p+He4→N+He4+π production and the breakup reaction p+He4→p+He3+n have been investigated. Cross sections and production features are presented. From the breakup reaction, subsamples of events in which a He3 or a n appear as spectators were selected. These events were used to study the virtual pn→pn and p+He3→p+He3 scattering. NUCLEAR REACTIONS He4(p, p), (p, pπ0), (p, nπ+), (p, pn), E=1.41 GeV; bubble chamber; measured σ; deduced n(p, p), He3(p, p).

Phys. Lett. B

A search for dimuons produced in a spark chamber experiment in neutrino and antineutrino beams of the Serpukhov accelerator is reported. The clear dimuon signal has been observed in vN interactions. R v = N (2 ω )/ N (1 ω )⩾ (6.2 ± 1.7) × 10 −3 in the energy interval 7.5 ÷ 30 GeV. From antineutrino data we conclude that in the same energy range R v ⩽ 1.1. × 10 −2 (90% C.L.) .

J. Phys. G

An observed asymmetry in the angle between the proton momentum transfer and the direction of the spectator nucleon in the break-up reaction pd to ppn at high energies is explained in terms of the strong (np) final-state interaction in the deuteron channel. The separable potential model for the (np) force used in the calculation of this effect also predicts the possibility of significant differences in the distributions of neutron and proton spectators, depending upon the relative phase of the high-energy pp and pn amplitudes.

J. Phys. G

The charge exchange channel of the proton-deuteron break-up reaction pd to npp at 1 GeV is studied in impulse approximation. The final-state interaction in the 1S0 state of the pp subsystem induces a slight asymmetry in the spectator proton angle and a threshold enhancement in the pp effective mass. The 20% of the observed events which have large effective mass may be explained quantitatively by the production of a Delta resonance which is de-excited through a final-state interaction with the spectator nucleon. It is concluded that almost all of the small-angle np charge exchange cross section at this energy involves nucleon spin-flip.