Sequential and simultaneous emission of fragments from p+Al collisions

Details Sequential and simultaneous emission of fragments from p+Al collisions Sequential and simultaneous emission of fragments from p+Al collisions

2011-09-14

arxiv.org/abs/1109.3043v1

Physics

Nuclear Physics

Nuclear Experiment

7 figures

Scientific paper

The energy and angular dependencies of double differential cross sections d^2sigma/dOmegadE were measured for p,d,t,^{3,4,6}He,^{6,7,8}Li,{7,9,10}Be, and ^{10,11,12}B produced in collisions of 1.2, 1.9, and 2.5 GeV protons with an Al target. The spectra and angular distributions of Li, Be, and B isotopes indicate a presence of two contributions: an isotropic, low energy one which is attributed to the evaporation of particles from excited remnants of the intranuclear cascade, and an anisotropic part which is interpreted to be due to multifragmentation of the remnants. It was found that such a hypothesis leads to very good description of spectra and angular distributions of all intermediate mass fragments (^6He-^{12}B) using the critical value of the excitation energy per nucleon as a single parameter, varying slowly with the beam energy.

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