Effective mass spectra of three secondary protons in the (p, 3p) reaction on the 12C nucleus at 660 MeV

Data on effective mass spectra for a system of three secondary protons are presented. The data have been obtained with a three-arm spark spectrometer in investigations of mechanisms for the (p, 3p) reaction on the carbon nucleus at 660 MeV in different experimental geometries. The total spectrum for all experimental geometries covers the mass range from 3060 MeV to 3300 MeV. The effective mass spectra obtained for the system of three secondary protons are well described within the errors by the calculated distributions that correspond to contributing reaction mechanisms in each experimental geometry. Thus a structure, which could be regarded as manifestation of three-proton resonances produced in the intermediate state, was not found with the statistics available for the effective mass spectra. 8 refs.; 2 figs