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New on-line NMR/ON nuclear magnetic dipole moments near 132Sn: I. At the shell closure: meson exchange current effects |
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| Authors: | Stone NJ White GN Rikovska J Ohya S Giles TJ Towner IS Brown BA Fogelberg B Jacobsson L Hjorth-Jensen M |
| Institution: | 1.Department of Physics, Oxford University, Parks Road, Oxford, OX1 3PU, UK ;2.Department of Neutron Research, Uppsala University, S-611 82, Nyk?ping, Sweden ;3.Department of Chemistry, University of Maryland, College Park, MD, 20742, USA ;4.Department of Physics, Niigata University, Ikarishi-2, Niigata, 950-2181, Japan ;5.Physics Department, Queen's University, Kingston, Ontario, Canada, K7L 3N6 ;6.TRIUMF, 4004 Westbrook Mall, Vancouver, BC, Canada, V6T 2A3 ;7.NSCL, Michigan State University, E. Lansing, MI, 48824, USA ;8.Nordita, Blegdamsvej 17, DK-2100, Copenhagen ?, Denmark ; |
| Abstract: | Recent on-line nuclear orientation measurements of nuclear magnetic dipole moments by the method of NMR on oriented nuclei (NMR/ON) have yielded significant new odd-A moments. These include those closest to double magic 132Sn, namely, 133Sb 132Sn plus one g7/2+ proton] and 133Tem 132Sn with a pair of g7/2+ protons and one hole in the h11/2- neutron sub-shell]. These close-to-double-magic results allow stringent tests of nuclear moment theory including, as main contributions to deviations from the simple free nucleon (Schmidt limit) values, configuration mixing in the nuclear wavefunction and mesonic exchange current modification to the dipole moment operator. Comparison with theoretical prediction, using established approaches to both these corrections, is discussed showing success in medium mass nuclei comparable to results previously established in light to 40Ca] and heavy near 208Pb] nuclei. This revised version was published online in August 2006 with corrections to the Cover Date. |
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