Elsevier

Nuclear Physics A

Volume 293, Issues 1–2, 12–19 December 1977, Pages 248-268
Nuclear Physics A

Magnetic moments of N = 50 isotones and proton core polarization

https://doi.org/10.1016/0375-9474(77)90490-0Get rights and content

Abstract

Pulsed heavy-ion beams of 4He, 6Li, 32S and 35C1 have been used to populate isomeric states in N = 50 nuclei having a closed neutron shell and a rather pure (pn12gm92) proton configuration. The g-factors of the 3.4 μs 172 state in 91Nb, the 9.3 ns 11 state in 92Mo, the 10.1 μs 172 in 93Tc, the 65.5 ns 6+ state and the 68 μs 8 + state in 94Ru were measured for the first time and those of 8+ states in 90Zr and in 92Mo were remeasured with improved accuracy. The g-factors increase by (4.2 ± 0.8)% as the p12 proton subshell is filled and decrease by (3.5 ± 1.4)% as the number of protons in the g92 shell increases from two to four. Calculations that take core polarization into account in first-order perturbation theory explain quantitatively the observed magnetic moments. One-pion exchange current contributions have also been calculated.

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    NRCC Postdoctoral Fellow.

    ††

    Present address: Oak Ridge National Laboratory, Tennessee, USA.

    †††

    Visiting Scientistat Queen's University, Kingston, Ontario, Canada during 1975–1976.

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