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 = 171☆

Nuclear Data Sheets for A = 231☆

Quenched E1 transition rates in 231Th

Nuclear structure of 183W studied in (n, γ), (n, n′γ) and (d, p) reactions

The nuclide /sup 231/Th was investigated with the reactions /sup 230/Th(n,..gamma..) /sup 231/Th, /sup 230/Th(n,..gamma..e)/sup 231/Th, and /sup 230/Th(d,p)/sup 231/Th. Gamma rays from average resonance capture were measured, in addition to the usual thermal neutron capture spectroscopy. From these data, 70 excited levels in /sup 231/Th were identified and, of these, 57 were placed in 18 rotational bands with assigned configurations. Candidates have been proposed for all expected Nilsson states below 750 keV, albeit with varying degrees of confidence, including the (5/2)/sup +/(622), (7/2)/sup +/(624), (3/2)/sup -/(761), (1/2)/sup -/(770), (1/2)/sup +/(640), and (5/2)/sup -/(503) configurations. Several vibrational states have been identified; a special feature of these is the observation of greater fragmentation of single-particle-0/sup +/ phonon-mixed states than expected theoretically. Assuming degenerate parity doublets indicate the existence of stable octupole deformation, no evidence was found for a tendency toward this phenomenon in /sup 231/Th. The neutron binding energy was determined to be 5118.13 +- 0.20 keV.

Nuclear structure of 170Tm from neutron-capture and (d,p)-reaction measurements.

The double neutron capture reaction 169Tm(n,γ)170Tm(n,γ)171Tm and the proton transfer reaction 170Er(3He,d)171Tm were used to study nuclear levels in 171Tm. The level scheme up to 1 MeV was confirmed and very precise level energies were determined. The results are compared with the quasiparticle-phonon model. Evidence was found, that the 1/2−[541] orbit has larger deformation than the other states.

THE LEVEL SCHEME OF 171Tm STUDIED BY MULTIPLE NEUTRON CAPTURE AND THE (3He,d) REACTION

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Nuclear structure of 170Tm from neutron-capture and (d,p)-reaction measurements.

THE LEVEL SCHEME OF 171Tm STUDIED BY MULTIPLE NEUTRON CAPTURE AND THE (3He,d) REACTION