2009, Vol.12, No.4, pp.414-418

The Reaction on ¹²C at KEK.

We study the reaction on ¹²C with a kaon beam of 1 GeV momentum, paying a special attention to the region of emitted protons having kinetic energy above 600 MeV, which was used to claim a deep kaon nucleus optical potential [1]. The experiment looks for fast protons emitted from the absorption of in flight kaons by nuclei, but in coincidence with at least one charged particle in the decay counters sandwiching the target. The analysis of the data is done in [1] assuming that the coincidence requirement does not change the shape of the final spectra. However our detailed calculations show that this assumption does not hold, and, thus, the final conclusion of this experiment is doubtful.

We perform Monte Carlo simulation of this reaction. The advantage of our method with respect to Green's function method used in [1] is that it allows to account not only for quasi-elastic scattering, but also for the other processes which contribute to the proton spectra. We investigated the effect of the multi-scatterings and of the K ^- absorptions by one and two nucleons ( and ) followed by the decay of the hyperon in . We show that all these mechanisms allow us to explain reasonably well the observed spectrum with “standard” shallow kaon nucleus optical potential, obtained in chiral models.
Key words: Kaon-nucleon interaction, Monte Carlo simulations, antikaon absorption in nuclei

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