The static quadrupole moments of the first 2+ states of 74Ge and 76Ge

doi:10.1016/0375-9474(72)90962-1

Nuclear Physics A

Volume 196, Issue 1, 20 November 1972, Pages 216-224

https://doi.org/10.1016/0375-9474(72)90962-1 Get rights and content

Abstract

The reorientation effect in Coulomb excitation has been used to determine the static quadrupole moments of the first 2⁺ states of the nuclei ⁷⁴Ge and ⁷⁶Ge. Thin foils of enriched ⁷⁴Ge and ⁷⁶Ge were bombarded by 25 MeV ¹⁶O ions. The relative excitation probabilities of the first 2⁺ states were measured as a function of projectile scattering angle. Particle-γ coincidences were used to identify the inelastic events. The data were analyzed with the aid of the coupled-channel computer program of Winther and De Boer and excitation of the first 2⁺ state via the second 2⁺ state was included in the analysis. If the interference term due to excitation via the second 2⁺ level is positive, such that the excitation probability is increased, then the extracted values of the static quadrupole moment are $Q_{2^{+}} = −0.25 ± 0.10 b for^{74} Ge$ and $Q_{2^{+}} = −0.15 ± 0.10 b for^{76} Ge$ . If the interference term is negative then Q_2⁺ = −0.17 ± 0.10 b for ²⁴Ge and $Q_{2^{+}} = −0.05 ± 0.10 b for^{76} Ge$ .

References (15)

J.J. Simpson et al.
Nucl. Phys.
(1969)
K. Kumar
Phys. Lett.
(1969)
A. Douglas et al.
Phys. Lett.
(1967)
K. Alder et al.
Nucl. Phys.
(1969)
C.M. Lederer et al.
Table of isotopes
(1967)
G. Schilling et al.
Phys. Rev.
(1970)
J.A. Thomson et al.
Phys. Rev.
(1971)

There are more references available in the full text version of this article.

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^∗: Work supported in part by the US Atomic Energy Commission and the National Science Foundation.

^†: Present address: Research Analysis Corporation, MacLean, Virginia, USA.

^††: Present address: Wittenberg University, Springfield, Ohio, USA.

^†††: Present address: Institut fiir Plasmaphysik, Munich, Germany.

^‡: Present address: University of Wisconsin, Madison, Wisconsin, USA.

^‡‡: Present address: Argonne National Laboratory, Argonne, Illinois, USA.

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The static quadrupole moments of the first 2+ states of 74Ge and 76Ge

Abstract

Nucl. Phys.

Phys. Lett.

Phys. Lett.

Nucl. Phys.

Table of isotopes

Phys. Rev.

Phys. Rev.

The static quadrupole moments of the first 2⁺ states of ⁷⁴Ge and ⁷⁶Ge