Abstract
New experimental data are presented that were obtained by studying the multifragmentation of 197Au, 209Bi, 238U, and 243Am nuclei in a coherent bremsstrahlung-photon beam with an endpoint energy of 4.1 GeV from the Erevan Synchrotron. For the first time, four or more fragments are observed. For all the nuclei studied here, the respective production cross sections are about (1–3)×10−3 of the total inelastic photon-nucleus cross section. The fragment yields are isotropic.
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