Pion emission in 2H, 12C, 27Al, gamma pi+ reactions at threshold

Details Pion emission in 2H, 12C, 27Al, gamma pi+ reactions at threshold Pion emission in 2H, 12C, 27Al, gamma pi+ reactions at threshold

2008-01-09

arxiv.org/abs/0801.1498v2

Nucl.Phys.A806:216-229,2008

Physics

Nuclear Physics

Nuclear Experiment

19 pages, 7 figures

Scientific paper

10.1016/j.nuclphysa.2008.02.308

The first data from MAX-lab in Lund, Sweden on pion production in photonuclear reactions at threshold energies, is presented. The decrease of the total yield of pi+ in gamma + 12C, 27Al reactions below 200 MeV as well as differential, dsigma/dOmega, cross sections follow essentially predictions from an intranuclear cascade model with an attractive potential for pion-nucleus interaction in its simplest form. Double differential, d2sigma/dOmegadT, cross sections at 176 MeV show, however, deviations from the model, which call for refinements of nuclear and Coulomb potentials and possibly also for coherent pion production mechanisms.

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