Elsevier

Nuclear Physics A

Volume 243, Issue 2, 19 May 1975, Pages 229-259
Nuclear Physics A

Excited states of the transitional 189Ir and 187Ir nuclei populated by the (α, 2n) reaction

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Abstract

Enriched targets of 187Re and 185Re were bombarded with α-particles of energy between 23.0 and 42.8 MeV. The levels characteristic of 189Ir and 187Ir produced by the (α, 2n) reaction were studied. The positive parity bands built on the 32+ ground state and on the 12+ first excited state in both nuclei were observed and interpreted as bands built on the 12+[402] and 12+ [400] Nilsson states. The negative parity levels form two independent systems: the first one possesses characteristics typical of a rotation-aligned band and is interpreted as belonging to the h92 orbital; the second one is connected with the 112 isomeric state which originates from the h112 orbital. The possibility of a triaxial shape for this h112. level system is discussed. In 189Ir a 3.2 ms isomeric state of 2333 keV excitation energy has been found and, as a by-product, some information has been gathered on the 4.1 ms isomer in 188Ir.

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    This work was done within the Grenoble-Świerk collaboration.

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