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Hyperfine Interactions and Lifetimes of Low-Energy States in W182 and W183

Agresti, D. and Kankeleit, E. and Persson, B. (1967) Hyperfine Interactions and Lifetimes of Low-Energy States in W182 and W183. Physical Review, 155 (4). pp. 1342-1351. ISSN 0031-899X.

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The Mössbauer technique has been used to study the nuclear hyperfine interactions and lifetimes in W182 (2+ state) and W183 (3/2- and 5/2- states) with the following results: g(5/2-)/g(2+)=1.40±0.04; g(3/2-)=-0.07±0.07; Q(5/2-)/Q(2+)=0.94±0.04; T1/2(3/2-)=0.184±0.005 nsec; T1/2(5/2-)≳0.7 nsec. These quantities are discussed in terms of a rotation-particle interaction in W183 due to Coriolis coupling. From the measured quantities and additional information on γ-ray transition intensities, magnetic single-particle matrix elements are derived. It is inferred from these that the two effective g factors, resulting from the Nilsson-model calculation of the single-particle matrix elements for the spin operators sz and s+, are not equal, consistent with the proposal of Bochnacki and Ogaza. The internal magnetic fields at the tungsten nucleus were determined for substitutional solid solutions of tungsten in iron, cobalt, and nickel. With g(2+)=0.24 the results are: Heff(W-Fe)=-715±10 kG; |Heff(W-Co)|=360±10 kG; |Heff(W-Ni)|=90±25 kG. The electric field gradients at the tungsten nucleus were determined for WS2 and WO3. With Q(2+)=-1.81 b the results are: for WS2, eq=-(1.86±0.05)×10^18 V/cm^2; for WO3, eq=(1.54±0.04)×10^18 V/cm^2 and η=0.63±0.02.

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Additional Information:©1967 The American Physical Society Received 31 October 1966 The advice of Dr. P. Duwez on metallurgical problems, Dr. R. Willems's suggestions related to the levitation-melting technique, and the many discussionswith Dr. E. Seltzer on the interpretation of the results are gratefully acknowledged. We thank Dr. F. Boehm for the generous hospitality of the Nuclear Spectroscopy and Solid State Group. One of us (B.P.) gratefully acknowledges partial financial support from the Swedish Government's Council for Atomic Research. This work was performed under the auspices of the U.S. Atomic Energy Commission. Prepared under Contract No. AT(04-3)-63 for the San Francisco Operations Office, U.S. Atomic Energy Commission.
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Deposited On:08 Jun 2006
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