The q-value of 157Tb

doi:10.1016/0375-9474(83)90350-0

Nuclear Physics A

Volume 408, Issue 1, 24 October 1983, Pages 87-98

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Abstract

Using mass-separated and chemically purified samples, the Q-value of ¹⁵⁷Tb has been remeasured as 62.9 ± 0.7 keV by determining electron capture ratios. The transition probability to the excited state was found to be (1.1 ± 0.1) × 10⁻³, with a transition energy of 8.4 ± 0.7 keV for this branch. From the proximity to the 2s binding energy, experiments on the internal bremsstrahlung electron capture seem feasible. The half-life of ¹⁵⁷Tb was remeasured as 99 ± 10 y.

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Using a chemically- and mass-separated source of ¹⁵⁸Tb the decay to the 1187 keV level in ¹⁵⁸Gd has been studied. The fraction of captures of electrons from the K-orbital was measured to be smaller than 5.2 × 10⁻⁵ and from the L-orbital to be 0.689 ± 0.010. Both observations are consistent with a ¹⁵⁸Tb — ¹⁵⁸Gd mass difference of 1222 ± 3 keV, thus rejecting the recent claim for a larger value.

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^†: Visitor from Zentralinstitut für Kernforschung, Rossendorf bei Dresden, GDR.

^††: Present address: Lawrence Berkeley Laboratory, Berkeley, Calif., USA.

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The q-value of 157Tb

Abstract

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

J. Phys. Soc. Japan

Atom. Nucl. Data Tables

Phys. Lett.

Phys. Rev.

Phys. Rev.

Rev. Mod. Phys.

The q-value of ¹⁵⁷Tb