Figure 1

Schematic figure showing the shears mechanism for (a) magnetic and (b) antimagnetic rotors. $\underset{¯}{J}$ is the total intrinsic angular momentum vector and ${\overline{j}}_{\pi }$ and ${\overline{j}}_{\nu }$ are the proton and neutron components, respectively. Note that the two lines shown for ${\overline{j}}_{\nu }$ in (b) represent the aligned neutrons and reflect the discussion given in the introduction regarding the composition of the proton and neutron vectors in an antimagnetic rotor. Both figures show the near-bandhead configuration for each type of mechanism.Reuse & Permissions

Figure 2

Representative spectra and fitted line shapes (solid lines) for the 956-, 1105-, and 1260-keV γ rays in the yrast band of ${}^{108}\mathrm{Cd}$. Dashed lines show contaminant peaks. The spectra shown are taken from averaged forward 31.72${}^{°}$ and 37.34${}^{°}$ ($\overline{\theta }=34.57$${}^{°}$) rings (top), the 90${}^{°}$ ring (middle), and averaged backward 142.62${}^{°}$ and 148.28${}^{°}$ ($\overline{\theta }=145.45$${}^{°}$) rings (bottom).Reuse & Permissions

Figure 3

Plot of B(E2) values against spin for the positive-parity yrast bands in (a) ${}^{106}\mathrm{Cd}$ and (b) ${}^{108}\mathrm{Cd}$. In (a) the solid line represents the B(E2) values obtained from TAC calculations through minimizing the energy in the rotating frame for a range of ${\beta }_2$ and γ values. The arrows in this panel show the relative orientations of the $g_{9/2}$ proton hole vectors (as deduced from the TAC calculations—see text) at various spins. The dotted line in panels (a) and (b) show the results of the CNS calculations for the configuration of interest. The semiclassical model calculations shown in both panels were obtained assuming that $j_{\nu }=16$ [dashed line, panel (b) only] and 18 (dot-dashed lines), respectively, as discussed in the text. Note that the data points with arrows at spin 26 [in panel (a)] and spin 22 in panel (b) represent lower limits for the B(E2) values since they were calculated using the effective lifetimes of these states.Reuse & Permissions

Figure 4

Plot of the dynamic moment of inertia $J^{(2)}$ vs spin for the antimagnetic bands in ${}^{106}\mathrm{Cd}$ (filled circles), ${}^{108}\mathrm{Cd}$ (open circles), and two of the smoothly terminating bands in ${}^{108}\mathrm{Sn}$ (filled squares) and ${}^{109}\mathrm{Sb}$ (open diamonds).Reuse & Permissions

Figure 5

Plot of the $J^{(2)}$/B(E2) ratio vs spin for the antimagnetic band in ${}^{106}\mathrm{Cd}$ and two of the smoothly terminating bands in ${}^{108}\mathrm{Sn}$ and ${}^{109}\mathrm{Sb}$ (using data taken from Ref. 23). Also shown are the values obtained from the TAC and CNS calculations.Reuse & Permissions