Nuclear levels in ${\mathrm{Re}}^{186}$ have been investigated by combining the following experimental techniques: the study of ($d,p$) and ($d,t$) reactions with 12-MeV deuterons and a broad-range magnetic spectrograph; the investigation of $\gamma$ transitions between 3.6 and 6.2 MeV from neutron capture using a Ge(Li) spectrometer; the measurement of ($n,\gamma$) radiation between 28 and 770 keV with a bent-crystal spectrometer; and the measurement of the ($n,e^{-}$) spectrum in the energy range 0-350 keV with a magnetic $\beta$ spectrometer. With the aid of ($d,p$) angular distributions and transition multipolarities, the energy levels up to an excitation energy of approximately 500 keV have been interpreted as arising from the coupling of the proton oribital [402 ↑] to the neutron orbitals [512 ↑], [510 ↑], and [503 ↑]. A possible proton excited state at 314 keV has been classified as resulting from the configuration $p\left[514\mathrm{}\uparrow \right]$; $n\left[512\mathrm{}\downarrow \right]$. Many higher-lying levels have also been observed. A Coriolis band-mixing calculation has been performed in an attempt to understand further the ${\mathrm{Re}}^{186}$ level structure below 500 keV. The ($d,p$) intensity pattern of the ground-state rotational band is in considerable disagreement with theoretical prediction, and it is suggested that residual interaction effects may be severely distorting the simple two-particle wave functions of the low-lying configurations.

• Received 5 August 1968

DOI:https://doi.org/10.1103/PhysRev.178.1919