Breakup of oxygen nucleus on four doubly charged fragments in O-16 + p interactions at incident momentum of 3.25 GeV/c per nucleon

The new experimental data on breakup of oxygen-16 nucleus on four doubly charged (Z = +2) fragments in O-16 + p interactions at 3.25 GeV/c per nucleon are presented. The number of such interaction events (with the formation of four doubly charged fragments) with simultaneous production of pi(+) + pi(-) + p(fr) with no recoil proton has proved to be equal to the number of events with simultaneous production of pi(+) + pi(-) as well as p(fr) + pi(-) in events with a recoil proton. For the first time, the experimental cross-section of the diffractive dissociation of the oxygen-16 nucleus on four alpha-particles in O-16 + p interactions at 3.25 GeV/c per nucleon has been determined to be sigma (diffr.) - 1.42 +/- 0.25 mb. The temperature of the diffractive breakup of oxygen nucleus on four alpha-particles has been calculated to be 7.6 +/- 0.7 MeV within the framework of the statistical model of fast fragmentation of Feshbach-Huang-Goldhaber. Using the obtained slope of the integral distribution on the square of a transverse momentum of a recoil proton in the laboratory system for the events of diffractive breakup of an oxygen nucleus on four alpha-particles, we have calculated the radius of a target. proton to be 0.84 +/- 0.05 fm, which agrees very well with the corresponding radius, 0.831 +/- 0.007 +/- 0.012 fm, determined a few years ago in the Jefferson Lab Proton Radius (PRad) experiment.