Three proton hole structure in ${}^{106}\mathrm{Ag}$

The negative parity non-yrast band of ${}^{106}\mathrm{Ag}$ has been studied to investigate the falling trend in magnetic dipole transition rates. In this context, the level lifetimes of the excited levels of this band have been measured using the Doppler shift attenuation method. The comparison of the experimental Routhian and the transition rates with the numerical results of the shears mechanism with the principal axis cranking calculation indicates that this band is generated due to the shears mechanism involving the three proton hole configuration.

Figure 1

Partial level scheme of the ${}^{106}\mathrm{Ag}$ nucleus including band 3 and its decay path to the ground state of the nucleus.

Figure 2

Examples of the line shape fits for $416 \left({16}^{-}\to {15}^{-}\right)$ keV and $1014 \left({18}^{-}\to {16}^{-}\right)$ keV transitions at ${40}^{\circ },{90}^{\circ }$, and ${157}^{\circ }$ with respect to the beam direction. The Doppler broadened line shapes are drawn in solid lines while the contaminant peaks are shown as dotted lines. The result of the fits to the experimental data are shown as dashed lines.

Figure 3

Angular momentum vector diagram used in the SPAC model.

Figure 4

Measured and the calculated (a) Routhian $\left(E_I-E_0\right)$, where $E_0$ is the band-head energy at ${11}^{-}$ level and (b) $B\left(M1\right)$ rates for band 3 of ${}^{106}\mathrm{Ag}$. Dotted line represents the $\pi g_{9/2}^{-1}\otimes \nu \left[h_{11/2}{(d_{5/2}/g_{7/2})}^2\right]$ configuration and the solid line represents the $\pi g_{9/2}^{-3}\otimes \nu h_{11/2}$ configuration up to $I=17\hslash$ and the $\pi g_{9/2}^{-3}\otimes \nu \left[h_{11/2}{(d_{5/2}/g_{7/2})}^2\right]$ configuration afterward. Error bars on measured values of a given level include errors in intensity and lifetime of the level added in quadrature.

Figure 5

Energy minimization plot using the SPAC calculation.

Figure 6

Variation for the theoretical values of $\theta ,{\theta }_I$, and R as a function of spin.

Figure 7

Measured and calculated $B\left(E2\right)$ rates for band 3 of ${}^{106}\mathrm{Ag}$ for ${eQ}_{\mathrm{eff}}=9$ e b and ${eQ}_{\mathrm{coll}}=1 e\mathrm{b}$.