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

Abstract

The new experimental data on breakup of oxygen-16 nucleus on four doubly charged ([Formula: see text]) fragments in [Formula: see text]O[Formula: see text] interactions at 3.25 GeV/[Formula: see text] per nucleon are presented. The number of such interaction events (with the formation of four doubly charged fragments) with simultaneous production of [Formula: see text] with no recoil proton has proved to be equal to the number of events with simultaneous production of [Formula: see text] as well as [Formula: see text] 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 [Formula: see text]-particles in [Formula: see text]O[Formula: see text] interactions at 3.25 GeV/[Formula: see text] per nucleon has been determined to be [Formula: see text] (diffr.)[Formula: see text] mb. The temperature of the diffractive breakup of oxygen nucleus on four [Formula: see text]-particles has been calculated to be [Formula: see text] 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 [Formula: see text]-particles, we have calculated the radius of a target proton to be [Formula: see text] fm, which agrees very well with the corresponding radius, [Formula: see text] fm, determined a few years ago in the Jefferson Lab Proton Radius (PRad) experiment.