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Proton emission off nuclei induced by kaons in flight

V. K. Magas1,*, J. Yamagata-Sekihara2,3, S. Hirenzaki4, E. Oset3, and A. Ramos1

  • 1Departament d’Estructura i Constituents de la Materia, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain
  • 2Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
  • 3Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Apartado 22085, 46071 Valencia, Spain
  • 4Department of Physics, Nara Women’s University, Nara 630-8506, Japan

  • *vladimir@ecm.ub.es
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Phys. Rev. C 81, 024609 – Published 24 February, 2010

DOI: https://doi.org/10.1103/PhysRevC.81.024609

Abstract

We study the (K−,p) reaction on nuclei with a 1 GeV/c momentum kaon beam, paying special attention to the region of emitted protons having kinetic energy above 600 MeV, which was used to claim a deeply attractive kaon nucleus optical potential. Our model describes the nuclear reaction in the framework of a local density approach and the calculations are performed following two different procedures: one is based on a many-body method using the Lindhard function and the other is based on a Monte Carlo simulation. The simulation method offers flexibility to account for processes other than kaon quasielastic scattering, such as K− absorption by one and two nucleons, producing hyperons, and allows consideration of final-state interactions of the K−, the p, and all other primary and secondary particles on their way out of the nucleus, as well as the weak decay of the produced hyperons into πN. We find a limited sensitivity of the cross section to the strength of the kaon optical potential. We also show a serious drawback in the experimental setup—the requirement for having, together with the energetic proton, at least one charged particle detected in the decay counter surrounding the target—as we find that the shape of the original cross section is appreciably distorted, to the point of invalidating the claims made in the experimental paper on the strength of the kaon nucleus optical.

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Phys. Rev. C 81, 024609– Published 24 February, 2010
  • Received 18 November 2009

© 2010 American Physical Society

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