%0 Conference Paper %B Eur. Phys. J.: Spec. Top. %D 2007 %T Nuclear magnetic moment of $^{57}$Cu ground state %A Minamisono, K. %A Mantica, P.F. %A Mertzimekis, T. J. %A Davies, A.D. %A Hass, M. %A Pereira, J. %A Pinter, J.S. %A Rogers, W. F. %A Stoker, J.B. %A Tomlin, B.E. %A Weerasiri, R.R. %X The nuclear magnetic moment of the ground state of 57 Cu(I? = 3/2-, T1/2 = 196.3 ms) has been measured to be ?(57Cu) = (2.00 ± 0.05) ?N using the ?-NMR technique. Together with the known magnetic moment of the mirror partner 57Ni, the spin expectation value was extracted as ?? ?z? = -0.78 ± 0.13. Discrepancy between present results and shell model calculations in the full fp shell implies significant shell breaking at 56Ni with the neutron number N = 28. © EDP Sciences/Societe? Italiana di Fisica/Springer-Verlag 2007. %B Eur. Phys. J.: Spec. Top. %C Department of Physics, Westmont College, Santa Barbara, CA 93108, United States %V 150 %P 145–146 %G eng %R 10.1140/epjst/e2007-00289-1