Dissociation Of Relativistic Be-7 Nuclei Through The He-3+He-4 Channel On A Proton Target

The differential cross section for the interaction of Be-7 nuclei with protons was measured in the momentum-transfer region extending up to a value of 0.5 GeV/c at which Be-7 decay to He-3 and He-4 fragments was not accompanied by the emergence of other charged particles. In the momentum-transfer region extending up to about 100 MeV/c, the cross section is strongly suppressed in just the same way as in the case of the dissociation of Li-7 nuclei on a proton target through the H-3+He-4 channel. The total reaction cross section is 10 +/- 4 mb. The mean transverse-momentum transfer in observed events is 233 +/- 6 MeV/c, the dispersion of its distribution being about 63 MeV/c. The interactions in question were detected in photoemulsion irradiated with Be-7 nuclei originating from a charge-exchange process involving Li-7 nuclei accelerated to the momentum of 1.7 GeV/c per nucleon at the nuclotron of the Joint Institute for Nuclear Research (Dubna).