Elsevier

Nuclear Physics A

Volume 99, Issue 2, 19 June 1967, Pages 321-336
Nuclear Physics A

On the signs of nuclear quadrupole moments

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Abstract

We analyse the experimental data on the signs of all the measured quadrupole moments in the ground states of nuclei. We find positive quadrupole moments in virtually all the cases where the last major proton and neutron shells are both more than one-fifth full. For odd-mass nuclei the quadrupole moment is negative (positive) when the odd nucleons occupy 18 or less (78 or more) of the last major shell. The last observation is shown to be an extension of the known rules for the signs of the quadrupole moments of odd-mass nuclei with one particle outside (or missing from) a closed shell.

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    ††

    Work supported in part by the U.S. Atomic Energy Commission.

    Now at Department of Physics, Northeastern University, Boston Mass.

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