High-Spin States in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ir</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>183</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ir</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>185</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> Nuclei: Is the Breaking of a Few Pairs of Nucleons Responsible for the Backbending Effect in the Osmium Region?

S. André; J. Genevey-Rivier; J. Treherne; J. Jastrzebski; R. Kaczarowski; J. Łukasiak

doi:10.1103/PhysRevLett.38.327

High-Spin States in ${}^{183}{Ir}$ and ${}^{185}{Ir}$ Nuclei: Is the Breaking of a Few Pairs of Nucleons Responsible for the Backbending Effect in the Osmium Region?

S. André, J. Genevey-Rivier, J. Treherne, J. Jastrzebski, R. Kaczarowski, and J. Łukasiak

Phys. Rev. Lett. 38, 327 – Published 14 February 1977

Abstract

High-spin levels of the rotation-aligned bands built on the $h_{\frac{9}{2}}$ subshell in ${}^{183}{Ir}$ and ${}^{185}{Ir}$ have been populated by ( $α, 6 n γ$ ) and ( $α, 4 n γ$ ) reactions. In ${}^{183}{Ir}$ a rapid increase in the apparent moment of inertia has been observed at high spins. The implication of this result for the interpretation of backbending phenomena in even nuclei in this mass region is discussed.