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The Renormalization of the Axial-Vector Strength in Nuclei: Experiments on Superallowed Beta-Decay

  • B. Jonson
  • M. J. G. Borge
  • P. G. Hansen
  • S. Mattsson
  • G. Nyman
  • A. Richter
  • K. Riisager
Conference paper

Abstract

It is known that the empirical coupling constant g<Stack><Subscript>A</Subscript><Superscript>′</Superscript></Stack> characterizing the axial-vector (or, Gamow-Teller) strength in nuclear beta-decay is reduced relative to the free-nucleon value gA determined from the neutron decay. This reduction, which was first estimated by WILKINSON [1], arises largely from pionic contributions and hence is one of the examples of sub-nucleonic effects in nuclear physics. Very approximately one may say that one part of the effect comes from virtual hole-delta pairs and another part from second-order core polarization brought about by the tensor force, which itself is predominantly due to one-pion exchange. Papers dealing with these problems, and references to earlier work, can be found in publication [2].

Keywords

Tensor Force Quenching Factor Neutron Decay Proton Detector ISOLDE Facility 
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 Berlin Heidelberg 1986

Authors and Affiliations

  • B. Jonson
    • 1
  • M. J. G. Borge
    • 2
  • P. G. Hansen
    • 2
    • 3
  • S. Mattsson
    • 1
  • G. Nyman
    • 1
  • A. Richter
    • 4
  • K. Riisager
    • 3
  1. 1.Dept. of PhysicsChalmers University of TechnologyGöteborgSweden
  2. 2.EP DivisionCERNGeneva 23Switzerland
  3. 3.Institute of PhysicsUniversity of AarhusAarhus CDenmark
  4. 4.Institut für KernphysikTHDarmstadtF. R. Germany

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