Measurement of electromagnetic moment on neutron excess nucleus 18N

18N was accelerated the first order beam 22Ne accelerated at a font step by using AVF cyclotron at the Institute of Physical and Chemical Research (RIKEN) to E/A = 110 MeV/u at a rear step using ring cyclotron, and was obtained under an incident angle nuclear fission reaction by irradiating 12C target. As a result of comparison between experimental values obtained from electromagnetic moment of the 18N and shell model type calculated ones using two kinds of effective correlation, it was found that the experimental values of magnetic moment showed a good agreement with PSDMK effective correlation, but PSDWBT effective correlation was calculated to be less than the experimental ones. On the other hand, in order to reproduce the testing results on electric quadrupole moment, it is necessary that neutron effective charge is made less than a standard value obtained near a stable nucleus. This is supported by a testing result on electric quadrupole moments of 14B and 15B, and suggests that coupling of core composed by p-shell proton and sd shell value neutron is weaker in comparison with proximity of the stable nucleus. (G.K.)