Gold fragmentation induced by stopped antiprotons

Details Gold fragmentation induced by stopped antiprotons Gold fragmentation induced by stopped antiprotons

2002-05-20

arxiv.org/abs/nucl-ex/0205012v1

Phys.Rev. C66 (2002) 044616

Physics

Nuclear Physics

Nuclear Experiment

14 pages, 9 figures, Revtex 4, to be published in Physical Review C

Scientific paper

10.1103/PhysRevC.66.044616

A natural gold target was irradiated with the antiproton beam from the Low Energy Antiproton Ring at CERN. Antiprotons of 200 MeV/c momentum were stopped in a thick target, products of their annihilations on Au nuclei were detected using the off-line gamma-ray spectroscopy method. In total, yields for 114 residual nuclei were determined, providing a data set to deduce the complete mass and charge distribution of all products with A > 20 from a fitting procedure. The contribution of evaporation and fission decay modes to the total reaction cross section as well as the mean mass loss were estimated. The fission probability for Au absorbing antiprotons at rest was determined to be equal to (3.8+-0.5)%, in good agreement with an estimation derived using other techniques. The mass-charge yield distribution was compared with the results obtained for proton and pion induced gold fragmentation. On the average, the energy released in pbar annihilation is similar to that introduced by ~ 1 GeV protons. However, compared to proton bombardment products, the yield distribution of antiproton absorption residues in the N-Z plane is clearly distinct. The data for antiprotons exhibit also a substantial influence of odd-even and shell effects.

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