Nuclear Quadrupole Precession After Recoil Implantation into Single Crystals for <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Hf</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>180</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> in Hf and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">W</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>186</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> in Gd

O. Klepper; E. N. Kaufmann; D. E. Murnick

doi:10.1103/PhysRevC.7.1691

Nuclear Quadrupole Precession After Recoil Implantation into Single Crystals for ${}^{180}{Hf}$ in Hf and ${}^{186}W$ in Gd

O. Klepper, E. N. Kaufmann, and D. E. Murnick

Phys. Rev. C 7, 1691 – Published 1 April 1973

Abstract

Coulomb excitation with ${}^{16}O$ and ${}^{32}S$ beams was used to excite, polarize, and implant ${}^{180}{Hf}$ (2+) in Hf single crystals and ${}^{186}W$ (2+) in Gd single crystals. Particle- $γ$ correlations for different crystal orientations were measured. The general features of the perturbed correlations were consistent with the prediction for a static axially symmetric quadrupole interaction in a single crystal, but additional perturbations had to be taken into account to explain the results quantitatively. Special experimental geometries were employed to separate these perturbations. In the ${}^{180}{Hf}$ in Hf experiment the sign of the quadrupole interaction could be unambiguously determined as negative using the known polarization of the excited nucleus. In the ${}^{186}W$ in Gd case unknown perturbation mechanisms reduced the terms linear in the quadrupole interaction frequency to such an extent that the negative sign indicated is less certain. Control experiments with implantation of ${}^{186}W$ in Cu foils were used to check the experimental technique for systematic errors.

NUCLEAR REACTIONS (HI Coulomb excitation) ${}^{186}W$ , $E ({}^{16}O) = 40$ MeV, $E ({}^{32}S) = 80$ MeV, recoil Gd single crystal; measured ${}^{16}O γ (θ)$ , ${}^{32}S γ (θ)$ ; deduced sign ${}^{186}W$ (2+) quadrupole interaction. ${}^{180}{Hf}$ , $E ({}^{16}O) = 40$ MeV, recoil Hf single crystal; measured ${}^{16}O γ (θ)$ ; deduced sign ${}^{180}{Hf}$ (2+) quadrupole interaction.

Received 2 January 1973

DOI:https://doi.org/10.1103/PhysRevC.7.1691

Authors & Affiliations

O. Klepper^*,†

Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

E. N. Kaufmann and D. E. Murnick

Bell Laboratories, Murray Hill, New Jersey 07974

^*Present address: University of Freiburg im Breisgau, Freiburg im Breisgau, Germany.
^†Work supported in part through funds provided by U. S. Atomic Energy Commission Contract No. AT(11-1)-3069.

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Vol. 7, Iss. 4 — April 1973

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