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Direct three-nucleon pion-absorption processes in 3He

  • S. Cierjacks
  • M. Furić
  • S. Ljungfelt
  • U. Mankin
  • T. Petković
  • N. Šimičević
  • H. Ullrich
  • G. Backenstoss
  • M. Izycki
  • P. Salvisberg
  • M. Steinacher
  • P. Weber
  • H. J. Weyer
Working Group 3: The Intermediate Energy Region
Part of the Lecture Notes in Physics book series (LNP, volume 260)

Abstract

A new reaction mechanism has been discovered in pion absorption on 3 He in which all three nucleons of the target are involved. From detailed measurements it has been shown that this type of reaction has a constant matrix element over the entire phase space of the 3N final state. This feature strongly supports a direct three-nucleon absorption process. Sequential processes like knock-out of one nucleon with subsequent absorption of the pion on the other two nucleons can be excluded. The fraction of the new reaction mechanism was found to be approximately 20% of the total pion absorption cross section in 3He. Possible relations of the new process with a three-body force are briefly mentioned.

Keywords

Absorption Cross Section Final State Interaction Nucleon Pair Pion Energy Entire Phase Space 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • S. Cierjacks
    • 1
    • 2
  • M. Furić
    • 1
    • 2
  • S. Ljungfelt
    • 1
    • 2
  • U. Mankin
    • 1
    • 2
  • T. Petković
    • 1
    • 2
  • N. Šimičević
    • 1
    • 2
  • H. Ullrich
    • 1
    • 2
  • G. Backenstoss
    • 3
  • M. Izycki
    • 3
  • P. Salvisberg
    • 3
  • M. Steinacher
    • 3
  • P. Weber
    • 3
  • H. J. Weyer
    • 3
  1. 1.Kernforschungszentrum KarlsruheInstitut für KernphysikKarlsruheGermany
  2. 2.Institut für Experimentelle KernphysikUniversity of KarlsruheKarlsruheGermany
  3. 3.Institut for PhysicsUniversity of BaselBaselSwitzerland

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