Nuclear magnetization distribution radii determined by hyperfine transitions in the 1s level of H-like ions {sup 185}Re{sup 74+} and {sup 187}Re{sup 74+}
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- Department of Physics, University of California at Berkeley, Berkeley, California 94720 (United States)
- Department of Physics, Goeteborg University and Chalmers University of Technology, SE-41296 (Sweden)
The F=3 to F=2 hyperfine transitions in the 1s ground state of the two isotopes {sup 185}Re{sup 74+} and {sup 187}Re{sup 74+} were measured to be (4560.5{plus_minus}3){Angstrom} and (4516.9{plus_minus}3){Angstrom}, respectively, using emission spectroscopy in an electron beam ion trap. After applying appropriate corrections for the nuclear charge distribution and QED effects, a Bohr-Weisskopf effect of {var_epsilon}=2.23(9){percent} and 2.30(9){percent} are found for {sup 185}Re and {sup 187}Re, respectively. This value is almost twice that of a previous theoretical estimate, and indicates a distribution of the nuclear magnetization far more extended than that of the nuclear charge. A radius of the magnetization distribution of {l_angle}r{sub m}{sup 2}{r_angle}{sup 1/2}=7.57(32) fm and {l_angle}r{sub m}{sup 2}{r_angle}{sup 1/2}=7.69(32) fm for {sup 185}Re and {sup 187}Re, respectively, is inferred from the data. These radii are larger than the nuclear charge distribution radius [{l_angle}r{sub c}{sup 2}{r_angle}{sup 1/2}=5.39(1) fm] for both isotopes by factors 1.40(6) and 1.43(6), respectively. We find that the Bohr-Weisskopf effect in H-like ions is a sensitive probe of nuclear magnetization distribution, especially for cases where the charge distribution and magnetic moments are accurately known. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 567037
- Journal Information:
- Physical Review A, Vol. 57, Issue 2; Other Information: PBD: Feb 1998
- Country of Publication:
- United States
- Language:
- English
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