Figure 1

Coincidence $\gamma$-ray spectra for bands SD1–SD6 in ${}^{154}\mathrm{Dy}$. The spectra were extracted from a four-fold coincidence histogram by summing all clean triple-gated spectra. The ND yrast transitions are marked with asterisks (*), and the transitions in the lowest negative-parity band are marked with filled squares. The symbol $\#$ in the SD1 spectrum denotes a 636-keV contamination from ${}^{153}\mathrm{Dy}$. The inset in each spectrum provides the intensity profile of the SD band.Reuse & Permissions

Figure 2

The dynamic moments of inertia $J^{(2)}$ of the six SD bands in ${}^{154}\mathrm{Dy}$ compared with those calculated for the configurations assigned to these bands. Experimental values are shown by filled circles; the theoretical results correspond to the solid lines. The $J^{(2)}$ moment of the yrast SD band in ${}^{152}\mathrm{Dy}$ is given by open circles.Reuse & Permissions

Figure 3

(Left) Neutron single-particle energies (Routhians) in the self-consistent rotating potential as a function of the rotational frequency $\hslash \omega$. They are given along the deformation path of the yrast configuration in ${}^{154}\mathrm{Dy}$ and obtained in the calculations with the NL1 parametrization of the RMF Lagrangian. Long-dashed, solid, dot-dashed, and dotted lines indicate $(\pi =+,r=+i)$, $(\pi =+,r=-i)$, $(\pi =-,r=+i)$, and $(\pi =-,r=-i)$ orbitals, respectively. At $\hslash \omega =0.0$ MeV, the single-particle orbitals are labeled by the asymptotic quantum numbers $[{\mathit{Nn}}_z\Lambda ]\Omega$ (Nilsson quantum numbers) of the dominant component of the wave function. The occupation of the neutron orbitals above the $N=86$ SD shell gap is shown by open and solid symbols for the $r=-i$ and $r=+i$ orbitals, respectively. The configurations are labeled by the letters (a) through (j). Their transition quadrupole moments $Q_t$ (in eb) and mass hexadecapole moments $H_{40}$ (in units of ${10}^4$ fm${}^4$), at rotational frequency $\hslash \omega =0.65$ MeV, are shown below the configuration labels. The values above the figure show the equilibrium $Q_t$ and $H_{40}$ moments at rotational frequency $\hslash \omega =0.65$ MeV of the configuration for which the Routhian diagram is plotted. (Right) The same as the left panel, but for the $\nu [761]3/2^{+}\otimes \nu [521]3/2^{+}$ configuration.Reuse & Permissions

Figure 4

The energies of the calculated SD configurations in ${}^{154}\mathrm{Dy}$ relative to a liquid drop reference $\mathit{AI}(I+1)$ with the inertia parameter $A=0.007$. The structure of calculated configurations is given in Fig. 3.Reuse & Permissions

Figure 5

Effective alignments for the observed SD bands in ${}^{154}\mathrm{Dy}$ and for the assigned configurations. Experimental values are shown by filled circles; the theoretical calculations are represented by solid lines. The yrast SD configuration (band) in ${}^{152}\mathrm{Dy}$ is used as a reference so that the effective alignment measures the effect of two additional neutrons.Reuse & Permissions

Figure 6

The $J^{(2)}$ moments of inertia rise vs rotational frequency for several SD bands in ${}^{151}\mathrm{Dy}$ [26], ${}^{152}\mathrm{Dy}$ [14], and ${}^{154}\mathrm{Dy}$.Reuse & Permissions