Nuclear Magnetic Moment of the {sup 57}Cu Ground State
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Particle Physics, Weizmann Institute, 76100 Rehovot (Israel)
- Department of Physics, Westmont College, Santa Barbara, California 93108 (United States)
The nuclear magnetic moment of the ground state of {sup 57}Cu(I{sup {pi}}=3/2{sup -},T{sub 1/2}=196.3 ms) has been measured to be vertical bar {mu}({sup 57}Cu) vertical bar =(2.00{+-}0.05){mu}{sub N} using the {beta}-NMR technique. Together with the known magnetic moment of the mirror partner {sup 57}Ni, the spin expectation value was extracted as <{sigma}{sigma}{sub z}>=-0.78{+-}0.13. This is the heaviest isospin T=1/2 mirror pair above the {sup 40}Ca region for which both ground state magnetic moments have been determined. The discrepancy between the present results and shell-model calculations in the full fp shell giving {mu}({sup 57}Cu){approx}2.4{mu}{sub N} and <{sigma}{sigma}{sub z}>{approx}0.5 implies significant shell breaking at {sup 56}Ni with the neutron number N=28.
- OSTI ID:
- 20778798
- Journal Information:
- Physical Review Letters, Vol. 96, Issue 10; Other Information: DOI: 10.1103/PhysRevLett.96.102501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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