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Level structure of odd-mass In nuclei and the unified model. II. In 117 levels populated in the decay of <mml:…

1979; American Institute of Physics; Volume: 20; Issue: 6 Linguagem: Inglês

10.1103/physrevc.20.2370

1538-4497

Michael D. Glascock, Edgar W. Schneider, W. B. Walters, S. V. Jackson, R. A. Meyer,

Atomic and Molecular Physics

Ge(Li) detectors have been used to perform singles, coincidence, and angular correlation measurements on $\ensuremath{\gamma}$ rays present in the decays of 2.5-h $^{117}\mathrm{Cd}^{g}(\frac{1}{{2}^{+}})$ and 3.4-h $^{117}\mathrm{Cd}^{m}(\frac{11}{{2}^{\ensuremath{-}}})$. A total of 112 of the 114 $\ensuremath{\gamma}$ rays observed in the decay of $^{117}\mathrm{Cd}^{g}$ and all 71 of the $\ensuremath{\gamma}$ rays observed in the decay of $^{117}\mathrm{Cd}^{m}$ have been placed in a level scheme consisting of 46 excited states. A total of 51 different $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ cascades were measured at 90\ifmmode^\circ\else\textdegree\fi{} and 180\ifmmode^\circ\else\textdegree\fi{}. The $\ensuremath{\beta}$ branchings from $^{117}\mathrm{Cd}^{g}$ to $^{117}\mathrm{In}^{m}$ and $^{117}\mathrm{Cd}^{m}$ to $^{117}\mathrm{In}^{g}$ were determined to be 20.4% and 1%, respectively. The thermal neutron cross sections for the production of $^{117}\mathrm{Cd}^{g}$ and $^{117}\mathrm{Cd}^{m}$ were determined to be 43\ifmmode\pm\else\textpm\fi{}2 mb and 8\ifmmode\pm\else\textpm\fi{}1 mb, respectively. Spin and parity assignments for the levels of $^{117}\mathrm{In}$ were made in many instances. The level structure is discussed in relation to the unified model calculation and possible one-proton---two-neutron configurations.RADIOACTIVITY $^{117}\mathrm{Cd}^{g}$ and $^{117}\mathrm{Cd}^{m}$ [from $^{116}\mathrm{Cd}$($n$,$\ensuremath{\gamma}$)]; measured ${E}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}$, $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coin, $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}(\ensuremath{\theta})$; deduced $\ensuremath{\beta}$ branch, $log\mathrm{ft}$, $\ensuremath{\sigma}(n,\ensuremath{\gamma})$, ${A}_{22}$, $\ensuremath{\delta}$. $^{117}\mathrm{In}$ deduced levels, $J$, $\ensuremath{\pi}$. Enriched target, Ge(Li) detectors, Compton suppression.