A review of the empirical data on intrinsic states of odd-$A$ nuclei in the mass range $151\ensuremath{\le}A\ensuremath{\le}193$ and $A\ensuremath{\ge}221$ is presented. Global summaries of the data are presented in tables for each isotopic and isotonic chain, wherein the excitation energy, the $log\mathrm{ft}$ values, the moment-of-inertia parameter, and the decoupling parameter (for $K=\frac{1}{2}$ bands) are listed for single-particle, vibrational admixed, and pure vibrational states. Similar data are separately presented for three-quasiparticle excitations in the rare-earth region. Taking guidance from the systematics on nuclear deformation, the single-particle deformed potential for axially symmetric and reflection-symmetric shapes (the Nilsson model) modified by the hexadecapole deformation is used to interpret the data. Other variations of the Nilsson model, which include axially asymmetric shapes ($\ensuremath{\gamma}$ deformation) and especially reflection-asymmetric shapes (octupole deformation), have also been used to interpret the data in certain limited regions. Systematics for the intrinsic excitations are presented and discussed in terms of these models. The newly emerging regions of the octupole-quadrupole deformation and superdeformation are also discussed.

Intrinsic states of deformed odd-A nuclei in the mass regions (151 221)

Nuclear Data Sheets for A = 56

Nuclear Data Sheets for A=231, 235, 239*

The Coulomb excitation of states in 229Th has been observed using 17.0-MeV 4He2+ ions. For the 5/2+[633] ground-state rotational band, we deduced an intrinsic quadrupole moment, Q20, of 8.816 ± 0.090 eb and an intrinsic hexadecapole moment, Q40, of 3.69 ± 0.72 eb2. This Q40 value for 229Th is 43% larger than that for the even-even neighbor, 230Th, and is the largest thus far observed in the actinide region. Large E3 matrix elements are extracted for states at 512, 562, and 611 keV, which supports the assignment of these states as members of a Kπ = 0− octupole-vibrational band built on the 5/2+[633] ground state. This 0− octupole excitation occurs at much higher energy than the one inferred from earlier decay studies that is built on the 3/2+[631] state. This suggests state-dependent octupole correlations consistent with octupole shape transitional models of 229Th.

http://iopscience.iop.org/article/10.1088/0031-8949/38/5/004/pdf

Coulomb excitation of states in 229Th

Nuclear Data Sheets for A = 233☆☆☆

Data on the inelastic deuteron scattering on low lying energy levels in167Er are presented as a supplement to an investigation of this nucleus by the (d,p) and (d,t) reactions.

Energy levels of 167 Er populated by the (d,d') reaction

Excited states in odd uranium isotopes233U and235U were studied by the inelastic scattering of 13·1 MeV deuterons. The multipolarities and reduced transition probabilities were extracted from experimental cross sections. The results are discussed within the framework of a unified model with Coriolis coupling and pairing effect included. Theγ-vibrational andβ-vibrational states were interpreted in both isotopes and the role of Coriolis coupling for excitation of some Nilsson states in235U was testified.

The study of the 233 U and 235 U by the inelastic scattering of 13·1 MeV deuterons

The inelastic scattering of 12·1 MeV deuterons from162Dy target has been investigated. Angular distributions of the inelastic groups were measured in the region from 30° to 150°. A magnetic spectrograph was used to record the deuteron spectra with an overall energy resolution of ∼15 keV. For the strongly populated collective levels the shape dependence of the angular distributions on transferred angular momentum was studied. The rather different shapes for the rotational and vibrational 2+ levels were observed. The tentative assignment of some other excited states populated by the (d,d′) process in162Dy was deduced.

Angular distributions of 12 MeV deuterons inelastically scattered by the162Dy

Excitation functions for the55Mn(p, p′ γ)55Mn,55Mn(p, n γ)55Fe and55Mn(p, γ)56Fe reactions are studied for proton beam energyEp=1·3–2 MeV. The excitation functions are established from yield functions for γ-rays emitted from the first excited states of final nuclei. Many resonances are observed and competition of their decay into all three output channels is analysed. Spin-parity assignment for some resonant states in the56Fe compound nucleus is deduced.

Excitation functions for some output channels following the p + 55 Mn interaction at E p =1·3 2·0 MeV

The behaviour of some excited states in odd uranium isotopes is compared with octupole vibrational states in even-even uranium isotopes. The possibility to interpret the states in odd isotopes as octupole vibrations is discussed.

J. Štěrbová

Papers

Energy levels of 167 Er populated by the (d,d') reaction

The study of the 233 U and 235 U by the inelastic scattering of 13·1 MeV deuterons

Angular distributions of 12 MeV deuterons inelastically scattered by the162Dy

Excitation functions for some output channels following the p + 55 Mn interaction at E p =1·3 2·0 MeV

The octupole states in odd uranium isotopes233U and235U