Figure 1

Proposed level scheme for ${}^{169}\mathrm{Ta}$; arrow width is proportional to the relative intensity of the γ rays. Tentative transitions and levels are denoted with dashed lines.Reuse & Permissions

Figure 2

Partial level scheme for ${}^{169}\mathrm{Ta}$ highlighting the low-spin portion of the diagram. Bandhead excitation energies are shown in italics.Reuse & Permissions

Figure 3

Representative coincidence spectra for bands 1 and 2. Unless otherwise indicated, the spectra provided are the result of a sum of all triple coincidence gates using $E2$ transitions. (a) Spectrum of band 1 ([402]5/2); inset displays the highest energy γ rays observed in the $\alpha =+1/2$ sequence. (b) Spectrum of band 2 ([404]7/2), where all combinations of triple gates of $E2$ transitions were used up to the 29/2${}^{+}$ state; high-energy inset displays the extension of the $\alpha =-1/2$ sequence, which was produced with all possible triple gates of $E2$ transitions above the 27/2${}^{+}$ state. (c) Spectrum of the high-energy portion of the $\alpha =+1/2$ sequence of band 2; all combinations of inband $E2$ transitions above the 29/2${}^{+}$ state were used to produce this spectrum. Asterisks denote coincident transitions from band 1.Reuse & Permissions

Figure 4

Excitation energies of the observed levels minus a rigid-rotor reference, where this reference was assumed to have a moment of inertia parameter $A=0.0077$ MeV. Positive (negative) signatures are represented with filled (open) symbols.Reuse & Permissions

Figure 5

(a) Spectrum of band 3 ([660]1/2) and the $\alpha =+1/2$ sequence of band 4 ([411]1/2). All combinations of $E2$ transitions above the 5/2 level within both bands were used to produce the spectrum. Solid circles denote γ rays originating from band 3 (b) Sample coincidence spectrum of the $\alpha =-1/2$ signature for band 4. All combinations of triple gates with inband transitions produced this spectrum.Reuse & Permissions

Figure 6

(a) Spectrum of the $\alpha =+1/2$ sequence of band 5 produced by summing all triple coincidence gates where two transitions were below the 37/2 state and one was above this level. High-energy γ rays are given in the inset. (b) Transitions belonging to the $\alpha =-1/2$ sequence of band 5. Lines marked with an asterisk or a circle are from the favored signature of bands 5 and 8, respectively. (c) Sample spectrum displaying the γ rays of band 6. This spectrum results from summing triple coincidence gates where two gating energies come from the list of 108, 223, 336, and 438 keV (from band 5), and the third gating energy was either the 310, 390, or 553 keV line in band 6. Asterisks denote transitions from band 5. (d) Spectrum of band 8 resulting from the summation of all possible triple-gate combinations on the inband $\Delta I=1$ transitions. High-energy γ rays are displayed in the inset.Reuse & Permissions

Figure 7

Alignments for the bands in ${}^{169}\mathrm{Ta}$. Harris parameters of ${\mathcal{J}}_0=28\hslash {}^2$/MeV and ${\mathcal{J}}_1=58\hslash {}^4$/MeV${}^3$ were used to subtract the angular momentum of the rotating core. Observed $\mathit{AB}$ neutron crossings are designated. Filled (empty) symbols denote $\alpha =+1/2$ ($-1/2$) sequences.Reuse & Permissions

Figure 8

Measured $B(M1)/B(E2)$ ratios for bands 1, 2, and 8 in ${}^{169}\mathrm{Ta}$. Filled (empty) symbols represent the experimental values for the $\alpha =+1/2$ ($-1/2$) sequence. Theoretical calculations are displayed as lines with the following configurations. (a) 1: $\pi d_{5/2}$[402]5/2; 2: $\pi g_{7/2}$[404]7/2; 3: $\pi d_{5/2}\nu \mathrm{AB}$; 4: $\pi g_{7/2}\nu \hspace{1em}\mathrm{AB}$. (b) 1: $h_{11/2}$[514]9/2; 2: $\pi h_{11/2}\nu \mathrm{AB}$; 3: $\pi h_{11/2}$ with $Q_0=6.5$ b; 4: $\pi h_{11/2}\nu \mathrm{AB}$ with $Q_0=6.5$ b.Reuse & Permissions

Figure 9

Quasiparticle Routhians for ${}^{169}\mathrm{Ta}$ calculated with the CSM. Deformation parameters of ${\beta }_2=0.22,{\beta }_4=0$, and $\gamma =0$ were assumed. Pairing energy was determined from experimental masses using the five-point fit procedure as described in Ref. [32]. Line types are defined as follows: solid (positive parity, $\alpha =+1/2$), dotted (positive parity, $\alpha =-1/2$), dashed (negative parity, $\alpha =-1/2$), and dash-dot (negative parity, $\alpha =+1/2$). (a) Pairing energy of ${\Delta }_n=1.22$ MeV was assumed; predicted crossings are displayed. (b) Pairing energy of ${\Delta }_p=1.26$ MeV was assumed; first proton crossing is also indicated.Reuse & Permissions

Figure 10

Experimental $\mathit{AB}$ crossing frequencies for the [404]7/2 and [541]1/2 bands in Ta isotopes. Note that the square shown for ${}^{167}\mathrm{Ta}$ is the crossing frequency observed in the [402]5/2 band. Dotted and dashed lines represent the CSM calculated crossing frequencies for these configurations when an empirical pairing strength was employed, see text for details.Reuse & Permissions

Figure 11

Alignment of $\pi d_{5/2}$ and $\pi d_{5/2}\nu i_{13/2}$ bands in ${}^{169}\mathrm{Ta}$ and ${}^{170}\mathrm{Ta}$, respectively. The same Harris parameters were used as in Fig. 7.Reuse & Permissions

Figure 12

Dynamic moments of inertia of the $\pi i_{13/2}$ bands in ${}^{169}\mathrm{Ta}$, ${}^{171}\mathrm{Ta}$, and ${}^{167}\mathrm{Lu}$.Reuse & Permissions

Figure 13

Bandhead energies in the Ta isotopic chain. (a) Experimental. (b) Predicted from calculations based on Woods-Saxon potential of Ref. [14].Reuse & Permissions