Elsevier

Nuclear Physics

Volume 30, February–March 1962, Pages 452-461
Nuclear Physics

Nuclear orientation of Tb156

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Abstract

Terbium-156 nuclei were oriented at low temperatures in an ethylsulphate lattice, and the anisotropies of several γ-rays in Gd156 were studied as functions of temperature, external magnetic field and magnetic environment. The results were explained using a five-term spin-Hamiltonian with two adjustable parameters, the magnetic dipole and electric quadrupole moments, which were thereby determined. The spin of Tb156 was shown to be 3, with |μ156| = 1.45±0.18 nm and Q156 = 1.4±0.5 b. The spin assignments of several high-energy states in Gd156 were confirmed, and a new 3-state at 2091 keV in Gd156 was indicated. The electron-capture transitions to states at 1943 and 2091-keV in Gd156 are predominantly Gamow-Teller.

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Work done under the auspices of the U.S. Atomic Energy Commission.

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