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All sourcesNASA NTRSDOE OSTI
DOE OSTI2010

Nuclear Data Sheets for A = 163

The available data from the various reaction and decay studies leading to nuclides having mass number A=163 have been reviewed. These data are summarized and presented, together with adopted level schemes and properties, for nuclides from Eu (Z=63) through Os (Z=76). {sup 163}Eu represents a new addition to these nuclides. Level structures are now known for {sup 163}Ta and {sup 163}W through high-spin studies and recoil-decay tagging techniques. Several radioactive decays in this mass chain are not known at all or poorly established. No {beta} or {gamma}-ray data are available for {sup 163}Re-{sup 163}W-{sup 163}Ta-{sup 163}Hf {epsilon} decay chain. Those for {sup 163}Hf-{sup 163}Lu-{sup 163}Yb {epsilon} decay chain and {sup 163}Eu-{sup 163}Gd-{sup 163}Tb {beta}{sup -} decay chain are very sketchy. This evaluation is an update and revision of the previous one (2000Si01)

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2010

The triaxial particle plus rotor model and wobbling mode: A semiclassical view

A systematic analysis of the triaxial particle rotor model with single-j shell configuration is carried out to explain the prominent features of observed wobbling excitations in odd A nuclei. The equations of motion for the angular momentum vectors I-vector and j-vector generate two types of equilibrium (i.e., (i) the axes aligned and (ii) the planar) states. The planar equilibrium states involve mainly the orientation degree of freedom {gamma} and their Jacobian matrix J gives purely imaginary eigenvalues in conjugate pairs. Also, our dynamical results show a substantial projection of angular momentum vectors on all the three principal axes, which implies that the resultant angular momentum lies outside the planes of three axes. Both these signatures confirm the spontaneous breakdown of time reversal (T) plus rotation by 180 deg. (R{sub {pi}}) i.e., R{sub {pi}T} symmetry and as a result nearly two identical bands consisting of even and odd spins emerge. We have tested our dynamical formalism for the wobbling mode observed in {sup 163}Lu.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2011

Rotational structures and the wobbling mode in {sup 167}Ta

Excited states in the neutron-deficient nucleus {sup 167}Ta were studied through the {sup 120}Sn({sup 51}V,4n) reaction. Twelve rotational bands have been observed and the relative excitation energy of each sequence is now known owing to the multiple interband connections. Several quasineutron alignments were observed that aided in the quasiparticle assignments of these bands. The resulting interpretation is in line with observations in neighboring nuclei. Trends in the wobbling phonon energy seen in {sup 161,163,165,167}Lu and {sup 167}Ta are also discussed and particle-rotor model calculations (assuming constant moments of inertia) are found to be inconsistent with the experimental data.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗