Magnetic Moment of the Lowest 6<SUP>+</SUP> State in <SUP>42</SUP>Ca

  • Nomura Toru
    Department of Physics, University of Tokyo Cyclotron Laboratory, The Institute of Physical and Chemical Research
  • Yamazaki Toshimitsu
    Department of Physics, University of Tokyo Cyclotron Laboratory, The Institute of Physical and Chemical Research
  • Nagamiya Shoji
    Department of Physics, University of Tokyo
  • Katou Takeo
    Cyclotron Laboratory, The Institute of Physical and Chemical Research

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  • Magnetic moment of the lowest 6+ state in 42Ca

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The g-factor of the 3190 keV 6+ state in 42Ca was measured by the time-differential perturbed-angular-distribution method in the 40Ca(α, 2p)42Ca reaction. The result is g=−(0.50−0.03+0.02). Assuming the 0.99f7⁄22+0.13f7⁄2f5⁄2 configuration for the 6+ state, the magnetic moment for the 0f7⁄2 neutron is deduced to be −1.99μN, being very different from the known magnetic moment of the 41Ca ground state. The strong violation of the additivity relation is interpreted by a larger mixing of the core-excited deformed states into the 41Ca ground state. The above magnetic moment for the 0f7⁄2 neutron supports recent proposal that the orbital g-factor is enhanced in nuclei by around 0.1τz if the quenching due to the second-order core polarization is taken into account.

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