Narrow Results

The reduced electric quadrupole transition rates have been calculated for states of the negative parity band in the ${}^{99}$Pd nucleus using semiclassical particle-rotor model calculations. The calculated transition rates are found to decrease with increasing spin states. The dynamic moment of inertia ${\Im }^{(2)}$ of the states above I = $23/2\hslash$ are found to be large. The spin ($\hslash$) versus frequency ($\hslash \omega$) plot obtained from the semiclassical model for the configuration $\pi {(g_{9/2})}^{-4}$ ⊗$\nu [h_{11/2}{(g_{7/2})}^2]$ is found to agree with the experimental data, which suggests a possible anti magnetic rotational character in the negative parity band.

The semiclassical particle-rotor model (SCM) has been used for the calculation of reduced electric quadrupole transition rates B(E2) for the $\nu h_{11/2}$ negative parity band in ${}^{101}$Ru. The B(E2) values are found to exhibit a decreasing behavior with increasing spin values in the range 27/2 $\hslash \le$ I $\le$ 47/2 $\hslash$. For the higher spin states, the experimental dynamic moment of inertia ${\Im }^{(2)}$ is also in the range of AMR bands. The calculation of spin ($\hslash$) versus frequency (MeV) for the $\pi {(g_{9/2})}^{-2}\otimes \nu [h_{11/2}{(g_{7/2})}^2]$ configuration with the core contribution of 2 $\hslash$ is found to be in good agreement with the experimental results and favors the possibility of AMR phenomenon in $\nu h_{11/2}$ negative parity band in ${}^{101}$Ru.