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Title: Nuclear magnetic moment of {sup 69}As from on-line {beta}-NMR on oriented nuclei

Abstract

A precise value for the magnetic moment of the {sup 69}As 5/2{sup -} ground state has been obtained from nuclear magnetic resonance on oriented nuclei (NMR/ON) using the NICOLE {sup 3}He-{sup 4}He dilution refrigerator setup at ISOLDE/CERN. The NMR/ON signal was observed by monitoring the anisotropy of the {sup 69}As {beta} particles. The center frequency {nu}[B{sub ext}=0.0994(10)T]=169.98(9) MHz corresponds to {mu}[{sup 69}As]=+1.6229(16){mu}{sub N}. This result differs considerably from the {pi}f{sub 5/2} single-particle value obtained with g factors for a free proton but is in reasonable agreement with the value obtained with effective g factors and with values from a core polarization calculation and from calculations in the framework of the interacting boson-fermion model. Assuming a single exponential spin-lattice relaxation behavior a relaxation time T{sub 1}{sup '}=10(25) s was observed for {sup 69}AsFe{sub -bar} at a temperature of about 20 mK in a magnetic field B=0.1 T.

Authors:
; ; ; ; ; ; ; ;  [1]; ; ; ;  [2]; ;  [3];  [4]
  1. K.U.Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium)
  2. Nuclear Physics Institute, ASCR, 250 68 Rez (Czech Republic)
  3. Helmholtz-Institut fuer Strahlen- und Kernphysik, Universitaet Bonn, D-53115 Bonn (Germany)
  4. ISOLDE, CERN, CH-1211 Geneva 23 (Switzerland)
Publication Date:
OSTI Identifier:
20771092
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.72.064316; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANISOTROPY; APPROXIMATIONS; ARSENIC 69; GROUND STATES; HELIUM 3; HELIUM 4; INTERACTING BOSON MODEL; LANDE FACTOR; MAGNETIC FIELDS; MHZ RANGE; NUCLEAR MAGNETIC MOMENTS; NUCLEAR MAGNETIC RESONANCE; ORIENTED NUCLEI; POLARIZATION; PROTONS; RELAXATION TIME; SPIN-LATTICE RELAXATION

Citation Formats

Golovko, V.V., Kraev, I.S., Phalet, T., Severijns, N., Delaure, B., Beck, M., Kozlov, V.Yu., Lindroth, A., Coeck, S., Zakoucky, D., Venos, D., Srnka, D., Honusek, M., Herzog, P., Tramm, C., and Koester, U. Nuclear magnetic moment of {sup 69}As from on-line {beta}-NMR on oriented nuclei. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.72.064316.
Golovko, V.V., Kraev, I.S., Phalet, T., Severijns, N., Delaure, B., Beck, M., Kozlov, V.Yu., Lindroth, A., Coeck, S., Zakoucky, D., Venos, D., Srnka, D., Honusek, M., Herzog, P., Tramm, C., & Koester, U. Nuclear magnetic moment of {sup 69}As from on-line {beta}-NMR on oriented nuclei. United States. doi:10.1103/PhysRevC.72.064316.
Golovko, V.V., Kraev, I.S., Phalet, T., Severijns, N., Delaure, B., Beck, M., Kozlov, V.Yu., Lindroth, A., Coeck, S., Zakoucky, D., Venos, D., Srnka, D., Honusek, M., Herzog, P., Tramm, C., and Koester, U. Thu . "Nuclear magnetic moment of {sup 69}As from on-line {beta}-NMR on oriented nuclei". United States. doi:10.1103/PhysRevC.72.064316.
@article{osti_20771092,
title = {Nuclear magnetic moment of {sup 69}As from on-line {beta}-NMR on oriented nuclei},
author = {Golovko, V.V. and Kraev, I.S. and Phalet, T. and Severijns, N. and Delaure, B. and Beck, M. and Kozlov, V.Yu. and Lindroth, A. and Coeck, S. and Zakoucky, D. and Venos, D. and Srnka, D. and Honusek, M. and Herzog, P. and Tramm, C. and Koester, U.},
abstractNote = {A precise value for the magnetic moment of the {sup 69}As 5/2{sup -} ground state has been obtained from nuclear magnetic resonance on oriented nuclei (NMR/ON) using the NICOLE {sup 3}He-{sup 4}He dilution refrigerator setup at ISOLDE/CERN. The NMR/ON signal was observed by monitoring the anisotropy of the {sup 69}As {beta} particles. The center frequency {nu}[B{sub ext}=0.0994(10)T]=169.98(9) MHz corresponds to {mu}[{sup 69}As]=+1.6229(16){mu}{sub N}. This result differs considerably from the {pi}f{sub 5/2} single-particle value obtained with g factors for a free proton but is in reasonable agreement with the value obtained with effective g factors and with values from a core polarization calculation and from calculations in the framework of the interacting boson-fermion model. Assuming a single exponential spin-lattice relaxation behavior a relaxation time T{sub 1}{sup '}=10(25) s was observed for {sup 69}AsFe{sub -bar} at a temperature of about 20 mK in a magnetic field B=0.1 T.},
doi = {10.1103/PhysRevC.72.064316},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 72,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}
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  • Nuclear magnetic resonance (NMR/ON) measurements with beta- and gamma-ray detection have been performed on oriented {sup 104}Ag{sup g,m} nuclei with the NICOLE {sup 3}He-{sup 4}He dilution refrigerator setup at ISOLDE/CERN. For {sup 104}Ag{sup g} (I{sup p}i=5{sup +}) the gamma-NMR/ON resonance signal was found at nu=266.70(5) MHz. Combining this result with the known magnetic moment for this isotope, the magnetic hyperfine field of Ag impurities in an Fe host at low temperature (<1 K) is found to be |B{sub hf}(AgFe)|=44.709(35) T. A detailed analysis of other relevant data available in the literature yields three more values for this hyperfine field. Averagingmore » all four values yields a new and precise value for the hyperfine field of Ag in Fe; that is, |B{sub hf}(AgFe)|=44.692(30) T. For {sup 104}Ag{sup m} (I{sup p}i=2{sup +}), the anisotropy of the beta particles provided the NMR/ON resonance signal at nu=627.7(4) MHz. Using the new value for the hyperfine field of Ag in Fe, this frequency corresponds to the magnetic moment mu({sup 104m}Ag)=+3.691(3) mu{sub N}, which is significantly more precise than previous results. The magnetic moments of the even-A {sup 102-110}Ag isotopes are discussed in view of the competition between the (pig{sub 9/2}){sub 7/2}{sup +-3}(nud{sub 5/2}nug{sub 7/2}){sub 5/2}{sup +} and the (pig{sub 9/2}){sub 9/2}{sup +-3}(nud{sub 5/2}nug{sub 7/2}){sub 5/2}{sup +} configurations. The magnetic moments of the ground and isomeric states of {sup 104}Ag can be explained by an almost complete mixing of these two configurations.« less
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