Bands In odd-A Nuclei Research Articles

Identical high- K three-quasiparticle rotational bands

A comprehensive study of high-K three-quasiparticle rotational bands in odd-A nuclei indicates the similarity in $\gamma$ -ray energies and dynamic moment of inertia $\Im^{(2)}$ . The extent of the identicality between the rotational bands is evaluated by using the energy factor method. For nuclei pairs exhibiting identical bands, the average relative change in the dynamic moment of inertia $\Im^{(2)}$ is also determined. The identical behaviour shown by these bands is attributed to the interplay of nuclear structure parameters: deformation and the pairing correlations. Also, experimental trend of the $ I(\hbar)$ vs. $\hbar \omega$ (MeV) plot for these nuclei pairs is shown to be in agreement with Tilted-Axis Cranking (TAC) model calculations.

Pairing and signature splitting in pf-shell nuclei

A comparative study of light pf shell nuclei using cranked Nilsson–Strutinsky model and the spherical shell model indicates that some of the signature splitting between the partner bands in odd-A nuclei originates from a gradual decrease in the contents of the pairing energy as spin increases.

Superdeformed Bands with ΔI = 4 Bifurcation of theOdd-A Nuclei in the A~190 Region

The γ-ray energy (Eγ) spectra of the superdeformed (SD)bands of odd-A nuclei in the A~190 mass region areinvestigated systematically. It is found that a ΔI = 4 bifurcationexists in the SD bands. Within the supersymmetry scheme includingmany-body interactions and a perturbation possessing the SO(5) (orSU(5)) symmetry on the rotational symmetry, the Eγ spectra,dynamical moments of inertia and Eγ differences δ4Eγ(I) of these bands are evaluated. Quantitative good results areobtained which show that the scheme is powerful to describe the ΔI = 4 bifurcation. The ΔI = 4 bifurcation may then come from theperturbation holding the SO(5) (or SU(5)) symmetry on the rotation.From a microscopic point of view, the ΔI = 4 bifurcation may be aresult of the combination of the β-phonon, γ-phonon and therotation.

Description of superdeformed identical bands of odd-Anuclei in theA∼190mass region

Description of superdeformed identical bands of odd-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi></mml:math>nuclei in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mi>∼</mml:mi><mml:mn>190</mml:mn></mml:math>mass region

Quasiparticle-Vibration Couplings in Rotating Triaxial Odd-A Nuclei

_ A new microscopic model which takes into account both the static and dynamic triaxial deformations in the high·spin states of odd-A nuclei is developed. The model is based on the rotating shell model and treats the quasiparticle-vibration couplings in the uniformly rotating frame of reference. Effects of the static and dynamic triaxial deformations on the signature splitting of the quasiparticle energies and on the signature dependence of B(M1), B(E2; I -+ I -1) and B(E2; 1-+ I - 2) for the transitions within the unique·parity bands in odd-A nuclei are discussed. Numerical exam­ ples are presented for odd-Z nuclei 157Ho, l59Tm and 161, 165Lu, and for odd-N nuclei 161Dy,167Er and 16l,l63, l67 Yb to which experimental data for B(M1) and B(E2) are available.

On the alpha intensities to rotational bands of odd-A nuclei

On the alpha intensities to rotational bands of odd-A nuclei