The problem of a quantum-mechanical description of a near-barrier fusion of heavy nuclei, that occurs at strong coupling of their relative motion to surface vibrations, is analyzed. To this end, an efficient finite-element method is proposed for numerically solving coupled Schrödinger equations with boundary conditions corresponding to total absorption. The method allows us to eliminate the instabilities in the numerical solutions that appear at a large number of coupled channels in some reactions. To illustrate the validity of our approach, the results of fusion cross section of the ${}^{64}\mathrm{Ni}+{}^{100}\mathrm{Mo}$ and ${}^{36}\mathrm{S}+{}^{48}\mathrm{Ca}$ reactions have been re-examined. The obtained results demonstrate a remarkable agreement with the available experimental data. It is found that experimental data can be reproduced with the use of the Woods-Saxon potential, without introducing the repulsive cores. It appears that the fusion cross sections at deep sub-barrier energies are sensitive to the potential pocket profile.

The second- and third-order azimuthal anisotropy Fourier harmonics of charged particles produced in $\text{pPb}$ collisions, at $\sqrt{s_{NN}}=8.16\text{TeV}$, are studied over a wide range of event multiplicities. Multiparticle correlations are used to isolate global properties stemming from the collision overlap geometry. The second-order “elliptic” harmonic moment is obtained with high precision through four-, six-, and eight-particle correlations and, for the first time, the third-order “triangular” harmonic moment is studied using four-particle correlations. A sample of peripheral $\text{PbPb}$ collisions at $\sqrt{s_{NN}}=5.02\text{TeV}$ that covers a similar range of event multiplicities as the $\text{pPb}$ results is also analyzed. Model calculations of initial-state fluctuations in $\text{pPb}$ and $\text{PbPb}$ collisions can be directly compared to the high-precision experimental results. This work provides new insight into the fluctuation-driven origin of the $v_3$ coefficients in $\text{pPb}$ and $\text{PbPb}$ collisions, and into the dominating overall collision geometry in $\text{PbPb}$ collisions at the earliest stages of heavy ion interactions.

Cluster structures of ${}^{14}\mathrm{C}$ were investigated with a method of antisymmetrized molecular dynamics (AMD) combined with a $3\alpha +nn$ cluster model while focusing on the monopole excitations and the linear-chain $3\alpha$ band. Variation after parity and angular-momentum projections was performed in the AMD framework, and the generator coordinate method was applied to take into account various $3\alpha +nn$ cluster configurations. Energy spectra and monopole and $E2$ transition strengths of $0^{+},2^{+}$, and $4^{+}$ states were calculated to assign band structures. The $0_3^{+}$ state with remarkable monopole transitions was obtained as a vibrational mode of the triangle $3\alpha$ configuration. In addition, the linear-chain $3\alpha$ band from the bandhead $0_4^{+}$ state was obtained. ${}^{10}\mathrm{Be}+\alpha$ decay widths of $0^{+},2^{+}$, and $4^{+}$ states were evaluated. $\alpha$ inelastic scattering off ${}^{14}\mathrm{C}$ was also investigated by the microscopic coupled-channel calculation with the $g$-matrix folding model to propose possible observation of the $0_3^{+}$ state via $\alpha$ scattering experiments.

Background: Recent advances in nuclear structure theory have led to the availability of several complementary ab initio many-body techniques applicable to light and medium-mass nuclei as well as nuclear matter. After successful benchmarks of different approaches, the focus is moving to the development of improved models of nuclear Hamiltonians, currently representing the largest source of uncertainty in ab initio calculations of nuclear systems. In particular, none of the existing two- plus three-body interactions is capable of satisfactorily reproducing all the observables of interest in medium-mass nuclei.

Purpose: A novel parametrization of a Hamiltonian based on chiral effective field theory is introduced. Specifically, three-nucleon operators at next-to-next-to-leading order are combined with an existing (and successful) two-body interaction containing terms up to next-to-next-to-next-to-leading order. The resulting potential is labeled $NN+3N\text{(lnl)}$. The objective of the present work is to investigate the performance of this new Hamiltonian across light and medium-mass nuclei.

Methods: Binding energies, nuclear radii, and excitation spectra are computed using state-of-the-art no-core shell model and self-consistent Green's function approaches. Calculations with $NN+3N\text{(lnl)}$ are compared to two other representative Hamiltonians currently in use, namely ${\mathrm{NNLO}}_{\text{sat}}$ and the older $NN+3N\left(400\right)$.

Results: Overall, the performance of the novel $NN+3N\text{(lnl)}$ interaction is very encouraging. In light nuclei, total energies are generally in good agreement with experimental data. Known spectra are also well reproduced with a few notable exceptions. The good description of ground-state energies carries on to heavier nuclei, all the way from oxygen to nickel isotopes. Except for those involving excitation processes across the $N=20$ gap, which is overestimated by the new interaction, spectra are of very good quality, in general superior to those obtained with ${\mathrm{NNLO}}_{\text{sat}}$. Although largely improving on $NN+3N\left(400\right)$ results, charge radii calculated with $NN+3N\text{(lnl)}$ still underestimate experimental values, as opposed to the ones computed with ${\mathrm{NNLO}}_{\text{sat}}$ that successfully reproduce available data on nickel.

Conclusions: The new two- plus three-nucleon Hamiltonian introduced in the present work represents a promising alternative to existing nuclear interactions. In particular, it has the favorable features of (i) being adjusted solely on $A=2,3,4$ systems, thus complying with the ab initio strategy, (ii) yielding an excellent reproduction of experimental energies all the way from light to medium-heavy nuclei, and (iii) behaving well under similarity renormalization group transformations, with negligible four-nucleon forces being induced, thus allowing large-scale calculations up to medium-heavy systems. The problem of the underestimation of nuclear radii persists and will necessitate novel developments.

Background: The limits of the nuclear landscape are determined by nuclear binding energies. Beyond the proton drip lines, where the separation energy becomes negative, there is not enough binding energy to prevent protons from escaping the nucleus. Predicting properties of unstable nuclear states in the vast territory of proton emitters poses an appreciable challenge for nuclear theory as it often involves far extrapolations. In addition, significant discrepancies between nuclear models in the proton-rich territory call for quantified predictions.

Purpose: With the help of Bayesian methodology, we mix a family of nuclear mass models corrected with statistical emulators trained on the experimental mass measurements. We study the impact of such model mixing in the proton-rich region of the nuclear chart.

Methods: Separation energies were computed within nuclear density functional theory using several Skyrme and Gogny energy density functionals. We also considered mass predictions based on two models used in astrophysical studies. Quantified predictions were obtained for each model using Bayesian Gaussian processes trained on separation-energy residuals and combined via Bayesian model averaging.

Results: We obtained a good agreement between averaged predictions of statistically corrected models and experiment. In particular, we quantified model results for one- and two-proton separation energies and derived probabilities of proton emission. This information enabled us to produce a quantified landscape of proton-rich nuclei. The most promising candidates for two-proton decay studies have been identified.

Conclusions: The methodology used in this work has broad applications to model-based extrapolations of various nuclear observables. It also provides a reliable uncertainty quantification of theoretical predictions.

The dynamical cluster-decay model (DCM) with mass window restriction and channel temperature is applied to study the decay of hot and rotating compound nucleus ${}^{181}\mathrm{Re}^{*}$ formed through the reaction ${}^{12}\mathrm{C}+{}^{169}\mathrm{Tm}$ at three different experimental incident energies, 77.18, 83.22, and 89.25 MeV, for spherical and deformed fragments. So far in DCM, the evaluation of various fission observables such as mass and charge distribution, decay cross section, kinetic energy, excitation energy, etc., were studied considering the entire mass range covering the limiting values of the mass asymmetry from 0 to 1, accounting for emission of light particles, complex intermediate mass fragments, as well as fission fragments. These emissions are considered as the dynamical collective mass motion of preformed clusters through the barrier. In this work, restriction of the mass window is considered in DCM as that of the experimental data for which cross section of the fission fragments is measured. The mass window restriction enhances the formation probability of the fragments. Further, instead of using a fixed temperature for all mass asymmetries (or channels), temperature tuning is attempted to see its effect on the outcome of the model. The obtained results of cross section values are found to compare reasonably well with the experimental data.

Excited states have been identified in the very neutron-deficient $N=Z+3$ nucleus ${}^{111}\mathrm{Xe}$ for the first time, using the ${}^{58}\mathrm{Ni}({}^{58}\mathrm{Ni},\alpha \mathrm{n})$ heavy-ion fusion-evaporation reaction. $\gamma$-ray transitions have been unambiguously assigned to ${}^{111}\mathrm{Xe}$ by correlation with the characteristic ${}^{111}\mathrm{Xe}\to {}^{107}\mathrm{Te}\to {}^{103}\mathrm{Sn}$ $\alpha$-decay chain using the method of recoil-decay tagging. Inspection of $\gamma \gamma$-coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an $h_{11/2}$ neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. The aligned angular momenta for the ${}^{111}\mathrm{Xe}$ band are constant over the range of observed rotational frequencies, suggesting that the first $\pi {\left(h_{11/2}\right)}^2$ alignment is either delayed or absent. It is speculated that the alignment of $h_{11/2}$ protons in the presence of neutrons in near-identical $h_{11/2}$ orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations.

A study of the ${}^{180}\mathrm{Hg}$ decay chain performed at the CERN-ISOLDE facility has allowed the ground-state–to–ground-state $\alpha$ decay of ${}^{180}\mathrm{Pt}$ to be investigated. A more precise $\alpha$-decay branching ratio of $b_{\alpha }{(}^{180}\text{Pt})=0.52\left(5\right)\%$ has been deduced. The reduced $\alpha$-decay width calculated using the new value provides a more consistent picture of the systematics for $J^{\pi }=0^{+}\to 0^{+}$ ground-state–to–ground-state state $\alpha$ decays of neutron-deficient, even-even platinum isotopes.

Densities and transition densities are computed in an equilateral triangular $\alpha$-cluster model for ${}^{12}\mathrm{C}$, in which each $\alpha$ particle is taken as a Gaussian density distribution. The ground state, the symmetric vibration (Hoyle state), and the asymmetric bend vibration are analyzed in a molecular approach and dissected into their components in a series of harmonic functions, revealing their intrinsic structures. The transition densities in the laboratory frame are then used to construct form factors and to compute distorted-wave Born approximation inelastic cross sections for the ${}^{12}\mathrm{C}(\alpha ,{\alpha }^{\prime })$ reaction. The comparison with experimental data indicates that the simple geometrical model with rotations and vibrations gives a reliable description of reactions where $\alpha$-cluster degrees of freedom are involved.

In this paper we study low-lying states of even-even $N=80$ isotones including ${}^{130}\mathrm{Sn}, {}^{132}\mathrm{Te}, {}^{134}\mathrm{Xe}, {}^{136}\mathrm{Ba}$, and ${}^{138}\mathrm{Ce}$, within the nucleon-pair approximation of the shell model. We calculate low-lying energy levels of these nuclei with both positive and negative parities. The wave functions of yrast $2_1^{+}-{10}_1^{+}$ states and $1_1^{-}-{11}_1^{-}$ states of these nuclei are analyzed in detail. Our calculations show that most of these states have a very simple structure in nucleon-pair basis: the $2_1^{+}$ states of ${}^{132}\mathrm{Te}, {}^{134}\mathrm{Xe}, {}^{136}\mathrm{Ba}$, and ${}^{138}\mathrm{Ce}$ are dominated by one $D^{+}$ neutron pair and spin $J=2$ proton excitation; the $4_1^{+}$ and $6_1^{+}$ states of ${}^{132}\mathrm{Te}$ and ${}^{134}\mathrm{Xe}$ are dominated by the proton excitation, while the $8_1^{+}$ and ${10}_1^{+}$ states are dominated by $S^{+}$ pairs of protons and one spin-eight and spin-ten pair of valence neutron holes (i.e., seniority-two excitations); for negative-parity states, the lowest states with spin four to seven of ${}^{132}\mathrm{Te}, {}^{134}\mathrm{Xe}, {}^{136}\mathrm{Ba}$, and ${}^{138}\mathrm{Ce}$ are essentially given by $S^{+}$ pairs of protons and one broken pair with spin four to seven consists of $h_{11/2}{d}_{3/2}$ valence neutron holes. The necessity of $J=10$ pairing interaction in the phenomenological monopole plus quadrupole shell-model Hamiltonian for $N=80$ isotones is demonstrated with analytical formulas for simple nucleon-pair configurations, and the pattern of $g$ factors is discussed based on simple arguments. Our calculated $B\left(E2\right)$ transition rates and $g$ factors of the low-lying states are well consistent with the experimental data.

For $\alpha$-decay half-life calculations in this work, the Coulomb and proximity potential model with a new semiempirical formula for diffuseness parameter developed in previous work [Phys. Rev. C 100, 024601 (2019)] is used. The present model in this work is compared with the generalized liquid-drop model (GLDM), universal decay law (UDL), and experimental half-lives in the region $Z=104–118$. Next, the predicted half-lives of 51 superheavy nuclei (SHN) with $Z=122–125$ by the present model are compared with those of GLDM and UDL. The present model is revealed to be more accurate in reproducing experimental half-lives compared to GLDM and UDL. Moreover, it is found that the predictions of the present model and UDL are highly consistent while GLDM largely deviates from the other two. A study of the competition between $\alpha$-decay and spontaneous fission (SF) shows that $\alpha$ decay is the dominant mode. Among the studied SHN with $Z=122–125$, ${}^{295–307}122$ and ${}^{314–320}125$ are identified as potential candidates whose half-lives are relatively long enough to be experimentally detected in the future through their $\alpha$-decay chains. The identified candidates are in good agreement with other recent work.

Background: Neutron transfer measurements for the ${}^{18}\mathrm{O}+{}^{28}\mathrm{Si}$ system have shown that the experimental one-neutron and two-neutron transfer cross sections are well reproduced with spectroscopic amplitudes from two different shell-model interactions for the Si isotopes: psdmod for the two-neutron transfer, and psdmwkpn for the one-neutron transfer.

Purpose: The need for two distinct shell-model interactions to reproduce two neutron-transfer processes in the same nuclei may cover a more complex mechanism in the one-neutron transfer that requires the unpairing of neutrons prior to its transfer in the (${}^{18}\mathrm{O},{}^{17}\mathrm{O}$) reaction. Studying a nucleus where this characteristic is absent (${}^{13}\mathrm{C}$) should help to elucidate this question.

Method: One-neutron transfer cross sections were measured for the ${}^{13}\mathrm{C}+{}^{28}\mathrm{Si}$ at $E_{lab}=30$ and 34 MeV, and compared with coupled reaction channel calculations using spectroscopic amplitudes derived from the psdmod and psdmwkpn shell-model interactions.

Results: The spectroscopic amplitudes from the psdmod interaction for the relevant states in ${}^{29}\mathrm{Si}$ provide a good description of the experimental data and the corresponding values agree with previous estimates obtained from the $(d,p)$ reaction.

Conclusions: The experimental data for the one-neutron transfer to ${}^{28}\mathrm{Si}$ induced by (${}^{13}\mathrm{C},{}^{12}\mathrm{C}$) reaction is well reproduced using spectroscopic amplitudes from the psdmod.

Enriched targets of ${}^{116,118,120,122,124}\mathrm{SnO}_2$ were bombarded with proton and deuteron beams, and the angular distributions of $(p,d)$ and $(d,p)$ on tin isotopes were accurately measured using the high-precision Q3D magnetic spectrograph at the Beijing HI-13 tandem accelerator of the China Institute of Atomic Energy. Distorted-wave Born approximation calculations were performed to extract the neutron spectroscopic factors (SFs) using two different sets of systematic optical potential parameters for these neutron transfer reactions. The SFs of ${}^{116–125}\mathrm{Sn}$ were obtained and compared to previous values. Our results are consistent with the average of the previous data within the error range. It is worth noting that the reaction products corresponding to ${}^{119}\mathrm{Sn}_{\text{G.S.}}$ and ${}^{119}\mathrm{Sn}_{\text{0.024}}^{*}$, to ${}^{123}\mathrm{Sn}_{\text{G.S.}}$ and ${}^{123}\mathrm{Sn}_{\text{0.025}}^{*}$, and to ${}^{125}\mathrm{Sn}_{\text{G.S.}}$ and ${}^{125}\mathrm{Sn}_{\text{0.028}}^{*}$ were first distinguished by the present experiment; therefore, our results of the low lying states of ${}^{119,123,125}\mathrm{Sn}$ are more reliable. However, the first excited state of ${}^{121}\mathrm{Sn}$ is only 0.006 MeV; we failed to identify the products that correspond to the ground state and the first excited state, and the extracted SFs of ${}^{120}\mathrm{Sn}_{\text{G.S.}}\otimes n\to {}^{121}\mathrm{Sn}_{\text{0.006.}}$ and ${}^{121}\mathrm{Sn}_{\text{0.006}}\otimes n\to {}^{122}\mathrm{Sn}_{\text{G.S}}$ are not reliable. A simple linear formula was used to analyze the relationship of SFs with neutron separation energy $S_n\left(N\right)$ and the even-$A$ Sn pairing gap $\mathrm{\Delta }\left(N\right)$, and SFs are found to be positively correlated to $S_n\left(N\right)$ and $\mathrm{\Delta }\left(N\right)$.

Within an improved transport model, we examine effects of the high momentum tail of the nucleon momentum distribution induced by short-range correlations on the proton-proton momentum correlation function in ${}^{197}\mathrm{Au}+{}^{197}\mathrm{Au}$ collisions at 400 MeV/nucleon. It is found that the proton-proton momentum correlation function from preequilibrium emissions responds sensitively to the presence as well as fraction of nucleons in the high momentum tail of the nucleon momentum distribution but is almost robustly insensitive to other factors, including the symmetry energy and the uncertainty of cutoff value of nucleon effective high momentum. In terms of the sensitivity and clearness, we propose that the proton-proton momentum correlation function from preequilibrium emissions can be as an effective probe of the high momentum tail of the nucleon momentum distribution.

We compute for the first time the suppression of bottomonia in a strongly coupled quark-gluon plasma (QGP) and compare the results to those from a weakly coupled QGP. Using imaginary time techniques we numerically determine the real and imaginary parts of the ground-state binding energy of the bottomonia in one potential computed from anti–de Sitter space/conformal field theory (AdS/CFT) and another computed from perturbative quantum chromodynamics. We confirm the strong-coupling binding energies by independently deriving the meson spectrum in AdS/CFT using semiclassical, rotating open strings. We then use these binding energies in a suppression model to determine the $\mathrm{{\rm Y}}$(1S) nuclear modification factor in ${\sqrt{s}}_{NN}=2.76$-TeV $\mathrm{Pb}+\mathrm{Pb}$ collisions. AdS/CFT significantly overpredicts the suppression compared to data, although the predictive power of our calculation is limited by its significant sensitivity to the exact details of the suppression model.

We work out domain walls in neutron ${}^{3}P_2$ superfluids realized in the core of neutron stars. Adopting the Ginzburg-Landau (GL) theory as a bosonic low-energy effective theory, we consider configurations of domain walls interpolating ground states, i.e., the uniaxial nematic (UN), ${\mathrm{D}}_2$-biaxial nematic (${\mathrm{D}}_2$-BN), and ${\mathrm{D}}_4$-biaxial nematic $({\mathrm{D}}_4$-BN) phases in the presence of zero, small and large magnetic fields, respectively. We solve the Euler-Lagrange equation from the GL free energy density, and calculate surface energy densities of the domain walls. We find that one extra Nambu-Goldstone mode is localized in the vicinity of a domain wall in the UN phase while a U(1) symmetry restores in the vicinity of one type of domain wall in the ${\mathrm{D}}_2$-BN phase and all domain walls in the ${\mathrm{D}}_4$-BN phase. Considering a pile of domain walls in the neutron stars, we find that the most stable configurations are domain walls perpendicular to the magnetic fields piled up in the direction along the magnetic fields in the ${\mathrm{D}}_2$-BN and ${\mathrm{D}}_4$-BN phases. We estimate the energy released from the deconstruction of the domain walls in the edge of a neutron star, and show that it can reach an astrophysical scale such as glitches in neutron stars.

The exclusive electroproduction process $ep\to e^{\prime }{p}^{\prime }{\pi }^0$ was measured in the range of photon virtualities $Q^2=0.4–1.0{\mathrm{GeV}}^2$ and the invariant mass range of the $p{\pi }^0$ system of $W=1.1–1.8$ GeV. These kinematics are covered in exclusive ${\pi }^0$ electroproduction off the proton with nearly complete angular coverage in the $p{\pi }^0$ center-of-mass system and with high statistical accuracy. Nearly 36 000 cross-section points were measured, and the structure functions ${\sigma }_T+\epsilon {\sigma }_L,{\sigma }_{LT}$, and ${\sigma }_{TT}$, were extracted via fitting the ${\varphi }_{{\pi }^0}$ dependence of the cross section. A Legendre polynomial expansion analysis demonstrates the sensitivity of our data to high-lying $N^{*}$ and ${\mathrm{\Delta }}^{*}$ resonances with $M>1.6$ GeV. As part of a broad effort to determine the electrocouplings of the $N^{*}$ and ${\mathrm{\Delta }}^{*}$ resonances using both single- and double-pion electroproduction, this dataset is crucial for the reliable extraction of the high-lying resonance electrocouplings from the combined isospin analysis of the $N\pi$ and ${\pi }^{+}{\pi }^{-}p$ channels.

We have measured the half-life of ${}^{34}\mathrm{Ar}$, the parent of a superallowed $0^{+}\to 0^{+}$ $\beta$ transition, to be 0.84646(35) s. With a precision of 0.04%, this result is an essential ingredient needed to complete a third pair of mirror superallowed transitions, ${}^{34}\mathrm{Ar}\to {}^{34}\mathrm{Cl}$ and ${}^{34}\mathrm{Cl}\to {}^{34}\mathrm{S}$, the ratio of whose $ft$ values would provide the most sensitive test yet of the isospin-symmetry-breaking corrections used to obtain $V_{ud}$. In a sequence repeated thousands of times, we implanted a very pure ${}^{34}\mathrm{Ar}$ beam into tape for 0.7 s, and then rapidly transported the collected source to a shielded $4\pi$ proportional gas counter, which detected the decay positrons from the combined decays of ${}^{34}\mathrm{Ar}$ and its daughter ${}^{34}\mathrm{Cl}$. The data were analyzed as a linked parent-daughter pair. Our new result replaces one we published 13 years ago.

We present a new approach to take into account resonance decays in the blast-wave model fits of identified hadron spectra. Thanks to precalculated decayed particle spectra, we are able to extract, in a matter of seconds, the multiplicity dependence of the single freeze-out temperature $T_{\mathrm{fo}}$, average fluid velocity $〈{\beta }_{\mathrm{T}}〉$, velocity exponent $n$, and the volume $dV/dy$ of an expanding fireball. In contrast to blast-wave fits without resonance feed-down, our approach results in a freeze-out temperature of $T_{\text{fo}}\approx 150\text{MeV}$, which has only weak dependence on multiplicity and collision system. Finally, we discuss separate chemical and kinetic freeze-outs separated by partial chemical equilibrium.

The intermediate and high-spin states of the ${}^{134}\mathrm{Ba}$ nucleus have been investigated up to spin $I^{\pi }=\left({20}^{-}\right)$ using the ${}^{124}\mathrm{Sn}({}^{13}\mathrm{C}, 3n){}^{134}\mathrm{Ba}$ reaction at a beam energy of 48 MeV. The $R_{\mathrm{DCO}}$ and polarization asymmetry measurements were carried out to assign the spin and parity of the levels. Three ($\mathrm{\Delta }I=2$) negative parity bands were studied above the 1985.9 keV level having spin $I^{\pi }=5^{-}$. The two quasiparticle $\nu [h_{11/2}\otimes (s_{1/2}/d_{3/2})]$ configuration has been assigned to these bands based on the systematics of the $\mathrm{Ba}$ (even-$N$) isotopes and similarity in the behavior of signature splitting and $B\left(M1\right)/B\left(E2\right)$ ratios. Further, two ($\mathrm{\Delta }I=1$) dipole bands have also been observed starting at the 5677.9 and 5284.5 keV levels with spin $I^{\pi }={14}^{-}$ and ${15}^{+}$, respectively. The configuration of these bands was suggested from the systematics of the similar structure in the neighboring nuclei. Tilted axis cranking (TAC) calculations were carried out using the four quasiparticle $\pi \left[h_{11/2}(g_{7/2}/d_{5/2})\right]\otimes \nu {\left[h_{11/2}\right]}^2$ and $\pi \left[h_{11/2}(g_{7/2}/d_{5/2})\right]\otimes \nu \left[h_{11/2}{d}_{3/2}\right]$ configurations for bands D1 and D2, respectively. The TAC calculations and systematic studies of similar structures in the neighboring $N=78$ isotones suggest that the dipole band (D1) observed at 5677.9 keV level may have the magnetic rotation character.