The European Physical Journal A

, Volume 43, Issue 2, pp 131–136 | Cite as

Invariant-mass distributions for the pp \( \rightarrow\) pp\( \eta\) reaction at Q = 10 MeV

  • P. Moskal
  • R. Czyżykiewicz
  • E. Czerwiński
  • D. Gil
  • D. Grzonka
  • L. Jarczyk
  • B. Kamys
  • A. Khoukaz
  • J. Klaja
  • P. Klaja
  • W. Krzemień
  • W. Oelert
  • J. Ritman
  • T. Sefzick
  • M. Siemaszko
  • M. Silarski
  • J. Smyrski
  • A. Täschner
  • M. Wolke
  • P. Wüstner
  • J. Zdebik
  • M. J. Zieliński
  • W. Zipper
Regular Article - Experimental Physics

Abstract

Proton-proton and proton-\( \eta\) invariant-mass distributions and the total cross-section for the pp \( \rightarrow\) pp \( \eta\) reaction have been determined near the threshold at an excess energy of Q = 10 MeV. The experiment has been conducted using the COSY-11 detector setup and the cooler synchrotron COSY. The determined invariant-mass spectra reveal significant enhancements in the region of low proton-proton relative momenta, similarly as observed previously at higher excess energies of Q = 15.5 MeV and Q = 40 MeV.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • P. Moskal
    • 1
    • 2
  • R. Czyżykiewicz
    • 1
    • 3
  • E. Czerwiński
    • 1
    • 2
  • D. Gil
    • 1
  • D. Grzonka
    • 2
  • L. Jarczyk
    • 1
  • B. Kamys
    • 1
  • A. Khoukaz
    • 4
  • J. Klaja
    • 1
    • 2
  • P. Klaja
    • 1
    • 2
  • W. Krzemień
    • 1
    • 2
  • W. Oelert
    • 2
  • J. Ritman
    • 2
  • T. Sefzick
    • 2
  • M. Siemaszko
    • 3
  • M. Silarski
    • 1
  • J. Smyrski
    • 1
  • A. Täschner
    • 4
  • M. Wolke
    • 5
  • P. Wüstner
    • 2
  • J. Zdebik
    • 1
  • M. J. Zieliński
    • 1
  • W. Zipper
    • 4
  1. 1.Institute of PhysicsJagellonian UniversityCracowPoland
  2. 2.Nuclear Physics InstituteResearch Center JülichJülichGermany
  3. 3.Institute of PhysicsUniversity of SilesiaKatowicePoland
  4. 4.IKPWestfälische Wilhelms-UniversitätMünsterGermany
  5. 5.Department of Physics and AstronomySE-751 05 Uppsala UniversityUppsalaSweden

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