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Level Properties of Mo 94 , Mo <mml:…

1972; American Institute of Physics; Volume: 6; Issue: 4 Linguagem: Inglês

10.1103/physrevc.6.1339

1538-4497

J. Barrette, M. Barrette, A. Boutard, R. Haroutunian, Guillaume Lamoureux, S. Monaro,

X-ray Spectroscopy and Fluorescence Analysis

The low-lying states of $^{94,\phantom{\rule{0ex}{0ex}}98,\phantom{\rule{0ex}{0ex}}100}\mathrm{Mo}$ have been investigated via multiple Coulomb excitation effected with 7.2-MeV $\ensuremath{\alpha}$ particles and 35- to 44.8-MeV oxygen projectiles. In the three isotopes studied ${2}^{+}$ and ${4}^{+}$ levels were excited up to 2.1 MeV. The double $E2$ excitation of a ${0}^{+}$ level at 694.4 keV in $^{100}\mathrm{Mo}$, very close in energy to the first ${2}^{+}$ excited state, was observed. The $E2$ transition between the ${0}^{+\ensuremath{'}}$ level and the first ${2}^{+}$ state is strongly enhanced, i.e., $\frac{B(E2;{0}^{+\ensuremath{'}}\ensuremath{\rightarrow}{2}^{+})}{B(E2;{2}^{+}\ensuremath{\rightarrow}{0}^{+})}=1.8\ifmmode\pm\else\textpm\fi{}0.3$. The values obtained for the ratio $\frac{B(E2;{2}^{+\ensuremath{'}}\ensuremath{\rightarrow}{2}^{+})}{B(E2;{2}^{+}\ensuremath{\rightarrow}{0}^{+})}$ and the ratio $\frac{B(E2;{4}^{+}\ensuremath{\rightarrow}{2}^{+})}{B(E2;{2}^{+}\ensuremath{\rightarrow}{0}^{+})}$ are 2.6 \ifmmode\pm\else\textpm\fi{} 0.6, 2.5 \ifmmode\pm\else\textpm\fi{} 0.4, 1.69 \ifmmode\pm\else\textpm\fi{} 0.22 and 1.53 \ifmmode\pm\else\textpm\fi{} 0.24, 2.3 \ifmmode\pm\else\textpm\fi{} 0.3, 1.85 \ifmmode\pm\else\textpm\fi{} 0.19, respectively, for $^{94}\mathrm{Mo}$, $^{98}\mathrm{Mo}$, and $^{100}\mathrm{Mo}$. States at 2533.7, 2017.6, and 1908.1 keV have been excited in $^{94}\mathrm{Mo}$, $^{98}\mathrm{Mo}$, and $^{100}\mathrm{Mo}$, respectively. These states are interpreted to be the result of direct $E3$ Coulomb excitation. Their $B(E3,{0}^{+}\ensuremath{\rightarrow}{3}^{\ensuremath{-}})$ values are 6.2 \ifmmode\pm\else\textpm\fi{} 1.2 ($^{94}\mathrm{Mo}$), 13.3 \ifmmode\pm\else\textpm\fi{} 1.3 ($^{98}\mathrm{Mo}$), and 13.2 \ifmmode\pm\else\textpm\fi{} 1.7 ($^{100}\mathrm{Mo}$) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}2}$ ${\mathit{e}}^{2}$${\mathrm{b}}^{3}$ which represent enhancements of 17, 33, and 32, respectively.