Elsevier

Nuclear Physics A

Volume 254, Issue 2, 8 December 1975, Pages 315-340
Nuclear Physics A

Charge parameters, isotope shifts, quadrupole moments, and nuclear excitation in muonic 170–174,176Yb

https://doi.org/10.1016/0375-9474(75)90219-5Get rights and content

Abstract

Muonic X-rays and nuclear γ-rays from separated isotopes of Yb with mass numbers 170–174 and 176 were measured. The parameters of the nuclear charge distribution were determined for each isotope. From the 2p splitting, intrinsic quadrupole moments were found with the following values: Q0(170) = 7.80 (4) b, Q0 (171) = 7.95 (4) b, Q0 (172) = 7.91 (4) b, Q0 (173) = 7.92 (5) b, Q0 (174) = 7.82 (5) b and Q0(176) = 7.59 (5) b, the quoted errors being statistical. These errors can be used for differences or ratios of the quadrupole moments. The total errors are 0.3 b. For the ground state of 173Yb a spectroscopic quadrupole moment of Q0 = 2.80 (04) b was derived from the observed 3d splitting. The combined analysis of the 2p and 3d splittings provided a sensitive test of the nuclear charge model in 173Yb. The isotope shifts were determined and interpreted in terms of a model independent parameter. The isomer shifts of the first excited 2+ states in 170Yb and 172Yb were found, as well as the isomer shift of the 1.039 MeV 0+ state in 172Yb. In 172Yb evidence was found for a pronounced resonance between the 3d12−1s12 transition and a nuclear state at 6.9314 (12) MeV. Several n scheme for the 6.931 MeV state in 172Yb was proposed.

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    This work is part of the thesis of A. Zehnder, submitted to the ETH-Zürich. The experiments were carried out at the Synchrocyclotron at CERN, 1211 Geneva 23, Switzerland.

    ††

    On leave from laboratorium für Hochenergiephysik, ETH-Zürich.

    †††

    National Science Foundation Senior Fellow on leave at CERN.

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